COHN, D.J., delivered the opinion of the court, in which MARTIN, J., joined. JONES, J. (pp. 800-806), delivered a separate dissenting opinion.
COHN, District Judge.
This is an appeal from a products liability judgment following a jury verdict, both in favor of defendant-appellee, Bayliner Marine Corporation (Bayliner). Plaintiffs-appellants (plaintiffs) are the representatives of persons either injured or killed when a sailboat manufactured by Bayliner (the Buccaneer 180) flooded and overturned on Lake Michigan in August of 1991. A jury found that the Buccaneer 180 was not defective and that Bayliner was not negligent. Plaintiffs’ motions for judgment as a matter of law and a new trial were denied. On appeal, plaintiffs argue that (1) the Buccaneer 180 was proven defective as a matter of law; (2) Bayliner was shown to be guilty of negligence as a matter of law; (3) the trial court erred in allowing the jury to reject testimony, whether contested or not; (4) the trial court erred in relying on irrelevant and immaterial evidence to justify the jury’s verdict; and (5) the jury’s verdict was against the great weight of the evidence. Bayliner responds that the trial court committed no legal error or abuse of discretion in denying plaintiffs’ motions. For the reasons which follow, the denial of plaintiffs’ motions for judgment as a matter of law and for a new trial will be affirmed.
I.
A.
On August 31, 1991, three adults and four children took a seventeen-foot Bayliner Buc[792]*792caneer 180 sailboat out onto Lake Michigan for approximately five hours. At around 7:30 p.m., the Buccaneer 180 flooded and overturned as it was returning to land. Only one adult and one child survived.
A half mile away from the pier, as the Buccaneer 180 returned to shore, the boat’s owner, Michael DeWilde (DeWilde) tried to start the outboard engine but it stalled. The surviving child, who had been sleeping in the cuddy cabin, woke up at the sound of the motor and found herself waist-deep in water.
Another adult yelled that the boat was taking on water, bailed two pailfuls, realized the water was coming in too fast, and told the children to get out of the boat. As the children, who were in the cuddy cabin, attempted to climb through its opening, the stern sunk to the water line and water began to pour in. The Buccaneer 180 quickly flooded and overturned. DeWilde estimates that the above events took approximately twenty seconds.
Hillary Powers, eight years old at the time of the accident, was thrown into the lake when the Buccaneer 180 overturned and was rescued the following morning after sixteen hours afloat.
Joey Bordeaux, Hillary’s brother, was four. He was trapped in the cuddy cabin after the Buccaneer 180 overturned but then was brought up to the surface and placed on the top of the capsized Buccaneer 180. After a few hours of being repeatedly washed from the boat, he died of exposure.
Timothy and Steven Knapp, aged ten and eight, drowned hours after the Buccaneer 180 overturned.
Nancy Diane Powers, twenty-six, left the overturned Buccaneer 180 after several hours in the water and drowned during the night. Her remains were found several months later.
Tom Muller, twenty-three, tried to swim to shore for help, but did not make it. His body was found several weeks later.
DeWilde survived the night and was rescued the next morning.
B.
Bayliner did not design the Buccaneer 180, but bought the plans from another company. DeWilde’s Buccaneer 180 was built in January of 1979. The centerboard keel on the Buccaneer 180 is designed to be retractable into the centerboard trunk, much like the blade of a pocket-knife folding into its handle. This design feature allows the Buccaneer 180 to be more easily transported out of the water. A rope travels from the centerboard keel underneath the Buccaneer 180, through a centerboard trunk hole, to a location in the cabin where a person can raise or lower the centerboard keel. Any water that comes in to the Buccaneer 180 through the centerboard trunk hole goes to the bilge area, generally not visible to occupants. The bilge can be directly drained of water when the Buccaneer 180 is out of the water or it can be bailed or pumped out through the cuddy cabin. The centerboard trunk hole is 12 inches from the bottom of the Buccaneer 180, which places the hole four inches above the waterline when the boat is empty. With a weight on board of 800 to 900 pounds1, the centerboard trunk hole is 1% inches above the water line. Neither party asserts any utility to the specific location of the centerboard trunk hole.
At a point after the Buccaneer 180 was placed in the marketplace, Bayliner recognized that the position of the centerboard trunk hole was a problem and conducted a retrofit campaign2 to raise the Buccaneer 180’s centerboard trunk hole by a dealer-installed device. There is no evidence, however, that any unmodified Buccaneer 180 had ever capsized as a result of the centerboard trunk hole design. Bayliner notified the owners known to it of the change, and sent letters to its dealers, asking them to contact purchasers in order to install the modifiea[793]*793tion. DeWilde purchased his Buccaneer 180 from a family, who in turn purchased it used. The family never received notice of the recall and that particular Buccaneer 180 was not fitted with the corrective device.
C.
1.
Plaintiffs sued Bayliner for wrongful death and personal injury in United States District Court for the Western District of Michigan in July of 1994. As the trial court instructed the jury, “plaintiffs claim that defendant Bayliner, one, manufactured and distributed a defective sailboat; and, two, was negligent in failing to warn of the sailboat’s dangers and in failing to conduct a reasonable recall or retrofit campaign.” More particularly, plaintiffs claimed that the centerboard trunk hole was a product defect and a proximate cause of the accident, and that Bayliner was therefore strictly liable under maritime law. Plaintiffs presented evidence through lay witnesses, expert testimony, and a videotaped test that the centerboard trunk hole allowed water to enter the subflooring of the Buccaneer 180, gradually filling the bilge and lowering the boat in the water.
' Plaintiffs offered thé testimony of Eric Sponberg (Sponberg) as an expert in naval architecture. Sponberg testified that the more weight there was on the Buccaneer 180, the shorter the distance between the lower lip of the boat’s centerboard trunk hole and the water line. Sponberg also testified that the closer the centerboard trunk hole was to the water line, the more water entered the bilge area of the Buccaneer 180, thus adding to the weight and decreasing the boat’s stability. Sponberg also described other boats he had examined, none of which had “a configuration that provides a hole located a foot from the bottom of the boat in an enclosed compartment that is not visible from the cockpit nor unbailable when the boat is under way.” Sponberg concluded his direct testimony by stating that “[t]his is a significantly dangerous boat.”
Plaintiffs also presented testimony from the following witnesses: Adolf Wolf (Wolf) testified about DeWilde’s sailing of the Buccaneer 180 on the night of the accident; G.
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COHN, D.J., delivered the opinion of the court, in which MARTIN, J., joined. JONES, J. (pp. 800-806), delivered a separate dissenting opinion.
COHN, District Judge.
This is an appeal from a products liability judgment following a jury verdict, both in favor of defendant-appellee, Bayliner Marine Corporation (Bayliner). Plaintiffs-appellants (plaintiffs) are the representatives of persons either injured or killed when a sailboat manufactured by Bayliner (the Buccaneer 180) flooded and overturned on Lake Michigan in August of 1991. A jury found that the Buccaneer 180 was not defective and that Bayliner was not negligent. Plaintiffs’ motions for judgment as a matter of law and a new trial were denied. On appeal, plaintiffs argue that (1) the Buccaneer 180 was proven defective as a matter of law; (2) Bayliner was shown to be guilty of negligence as a matter of law; (3) the trial court erred in allowing the jury to reject testimony, whether contested or not; (4) the trial court erred in relying on irrelevant and immaterial evidence to justify the jury’s verdict; and (5) the jury’s verdict was against the great weight of the evidence. Bayliner responds that the trial court committed no legal error or abuse of discretion in denying plaintiffs’ motions. For the reasons which follow, the denial of plaintiffs’ motions for judgment as a matter of law and for a new trial will be affirmed.
I.
A.
On August 31, 1991, three adults and four children took a seventeen-foot Bayliner Buc[792]*792caneer 180 sailboat out onto Lake Michigan for approximately five hours. At around 7:30 p.m., the Buccaneer 180 flooded and overturned as it was returning to land. Only one adult and one child survived.
A half mile away from the pier, as the Buccaneer 180 returned to shore, the boat’s owner, Michael DeWilde (DeWilde) tried to start the outboard engine but it stalled. The surviving child, who had been sleeping in the cuddy cabin, woke up at the sound of the motor and found herself waist-deep in water.
Another adult yelled that the boat was taking on water, bailed two pailfuls, realized the water was coming in too fast, and told the children to get out of the boat. As the children, who were in the cuddy cabin, attempted to climb through its opening, the stern sunk to the water line and water began to pour in. The Buccaneer 180 quickly flooded and overturned. DeWilde estimates that the above events took approximately twenty seconds.
Hillary Powers, eight years old at the time of the accident, was thrown into the lake when the Buccaneer 180 overturned and was rescued the following morning after sixteen hours afloat.
Joey Bordeaux, Hillary’s brother, was four. He was trapped in the cuddy cabin after the Buccaneer 180 overturned but then was brought up to the surface and placed on the top of the capsized Buccaneer 180. After a few hours of being repeatedly washed from the boat, he died of exposure.
Timothy and Steven Knapp, aged ten and eight, drowned hours after the Buccaneer 180 overturned.
Nancy Diane Powers, twenty-six, left the overturned Buccaneer 180 after several hours in the water and drowned during the night. Her remains were found several months later.
Tom Muller, twenty-three, tried to swim to shore for help, but did not make it. His body was found several weeks later.
DeWilde survived the night and was rescued the next morning.
B.
Bayliner did not design the Buccaneer 180, but bought the plans from another company. DeWilde’s Buccaneer 180 was built in January of 1979. The centerboard keel on the Buccaneer 180 is designed to be retractable into the centerboard trunk, much like the blade of a pocket-knife folding into its handle. This design feature allows the Buccaneer 180 to be more easily transported out of the water. A rope travels from the centerboard keel underneath the Buccaneer 180, through a centerboard trunk hole, to a location in the cabin where a person can raise or lower the centerboard keel. Any water that comes in to the Buccaneer 180 through the centerboard trunk hole goes to the bilge area, generally not visible to occupants. The bilge can be directly drained of water when the Buccaneer 180 is out of the water or it can be bailed or pumped out through the cuddy cabin. The centerboard trunk hole is 12 inches from the bottom of the Buccaneer 180, which places the hole four inches above the waterline when the boat is empty. With a weight on board of 800 to 900 pounds1, the centerboard trunk hole is 1% inches above the water line. Neither party asserts any utility to the specific location of the centerboard trunk hole.
At a point after the Buccaneer 180 was placed in the marketplace, Bayliner recognized that the position of the centerboard trunk hole was a problem and conducted a retrofit campaign2 to raise the Buccaneer 180’s centerboard trunk hole by a dealer-installed device. There is no evidence, however, that any unmodified Buccaneer 180 had ever capsized as a result of the centerboard trunk hole design. Bayliner notified the owners known to it of the change, and sent letters to its dealers, asking them to contact purchasers in order to install the modifiea[793]*793tion. DeWilde purchased his Buccaneer 180 from a family, who in turn purchased it used. The family never received notice of the recall and that particular Buccaneer 180 was not fitted with the corrective device.
C.
1.
Plaintiffs sued Bayliner for wrongful death and personal injury in United States District Court for the Western District of Michigan in July of 1994. As the trial court instructed the jury, “plaintiffs claim that defendant Bayliner, one, manufactured and distributed a defective sailboat; and, two, was negligent in failing to warn of the sailboat’s dangers and in failing to conduct a reasonable recall or retrofit campaign.” More particularly, plaintiffs claimed that the centerboard trunk hole was a product defect and a proximate cause of the accident, and that Bayliner was therefore strictly liable under maritime law. Plaintiffs presented evidence through lay witnesses, expert testimony, and a videotaped test that the centerboard trunk hole allowed water to enter the subflooring of the Buccaneer 180, gradually filling the bilge and lowering the boat in the water.
' Plaintiffs offered thé testimony of Eric Sponberg (Sponberg) as an expert in naval architecture. Sponberg testified that the more weight there was on the Buccaneer 180, the shorter the distance between the lower lip of the boat’s centerboard trunk hole and the water line. Sponberg also testified that the closer the centerboard trunk hole was to the water line, the more water entered the bilge area of the Buccaneer 180, thus adding to the weight and decreasing the boat’s stability. Sponberg also described other boats he had examined, none of which had “a configuration that provides a hole located a foot from the bottom of the boat in an enclosed compartment that is not visible from the cockpit nor unbailable when the boat is under way.” Sponberg concluded his direct testimony by stating that “[t]his is a significantly dangerous boat.”
Plaintiffs also presented testimony from the following witnesses: Adolf Wolf (Wolf) testified about DeWilde’s sailing of the Buccaneer 180 on the night of the accident; G. Ronald Wright (Wright) and Peter Manting (Manting), both ex-owners of Buccaneer 180s, testified that the Buccaneer 180 took on water in normal sailing conditions; and E. Patrick McGuire (McGuire), a products safety consultant, testified that Bayliner’s retrofit campaign was unacceptable.
2.
Bayliner countered that plaintiffs’ expert and tests were not credible and that there were alternate causes for the Buccaneer 180’s capsize. Bayliner offered evidence that the adults drank beer and smoked marijuana during the course of the sailing trip, the Buccaneer 180 was overloaded with seven people and was low on the water as it left shore, the weather during the sail was threatening, there were an insufficient number of life preservers on board, there was no radio or flares on board, and early warnings of water coming on board were ignored. Bayliner presented testimony from a small-boat sailor, Augusto Villalon (Villalon), who criticized DeWilde’s sailing and Sponberg’s evidence, and from a Bayliner engineer, Clark Scarboro (Scarboro), who testified as to the design of the Buccaneer 180 and stated that no Buccaneer 180 had ever overturned because of flooding. Bayliner also cross-examined plaintiffs’ witnesses as to their credibility and substantive testimony.
3.
At the close of all proofs, both parties moved for judgment as a matter of law pursuant to Fed.R.Civ.P. 50(a). The trial court denied the motion and submitted the case to the jury. Neither party objected to the proposed jury instructions, and the trial court instructed the jury as follows:
OPINION EVIDENCE-EXPERT WITNESS
The rules of evidence ordinarily do not permit witnesses to testify as to opinions or conclusions. An exception to this rule exists as to those whom we call “expert witnesses.” Witnesses who, by education and experience, have become expert in some art, science, profession, or calling, [794]*794may state their opinions as to relevant and material matters, in which they profess to be expert and may also state their reasons for the opinion.
You should consider each expert opinion received in evidence in this case and give it such weight as you may think it deserves. If you should decide that the opinion of an expert witness is not based upon sufficient education and experience, or if you should conclude that the reasons given in support of the opinion are not sound, or if you feel that it is outweighed by other evidence, you may disregard the opinion entirely.
SINGLE WITNESS
The testimony of a single witness which produces in your minds belief in the likelihood of truth is sufficient for the proof of any fact and would justify a verdict in accordance with such testimony even though a number of witnesses may have testified to the contrary if, after consideration of all the evidence in the case, you hold greater belief in the accuracy and reliability of the one witness.
CREDIBILITY OF WITNESSES— DISCREPANCIES IN TESTIMONY
You, as jurors, are the sole judges of the credibility of the witnesses and the weight their testimony deserves. You may be guided by the appearance and conduct of the witness or by the manner in which the witness testifies or by the character of the testimony given or by the evidence contrary to the testimony given.
You should carefully scrutinize all the testimony given, the circumstances under which each witness has testified, and every matter in evidence which tends to show whether a witness is worthy of belief. Consider each witness’s intelligence, motive, and state of mind and demeanor or manner while on the stand. Consider the witness’s ability to observe the matters as to which he or she has testified and whether he or she impresses you as having an accurate recollection of these matters.
Consider also any relation each witness may bear to either side of the case; the manner in which each witness might be affected by the verdict; and the extent to which, if at all, each witness is either supported or contradicted by other evidence in the case.
Inconsistencies or discrepancies in the testimony of a witness or between the testimony of different witnesses may or may not cause the jury to discredit such testimony_ [Y]ou will give the testimony of each witness such weight, if any, as you may think it deserves. You may in short, accept or reject the testimony of any witness in whole or in part.
IMPEACHMENT-INCONSISTENT STATEMENTS OR CONDUCT
A witness may be discredited or impeached by contradictory evidence.... If you believe any witness has been impeached and thus discredited, it is your exclusive province to give the testimony of that witness such credibility, if any, as you may think it deserves.
NOT REQUIRED TO ACCEPT UNCONTRADICTED TESTIMONY
You are not required to accept testimony even though the testimony is uneontra-dicted and the witness es not impeached. You may decide, because of the witness’s bearing and demeanor or because of the inherent improbability of his or her testimony or for other reasons you find sufficient, that such testimony is not worthy of belief.
PLAINTIFFS’ CLAIMS
The plaintiffs must establish [four] essential elements in order to recover on their claim that the Bayliner Buccaneer 180 was defectively designed or manufactured as follows.
[795]*795First, that the boat was in a defective condition at the time it left the possession of the manufacturer.
Second, that the boat was unreasonably dangerous at the time it left the possession of the manufacturer.
Third, that the defective condition was a proximate cause of the plaintiffs’ injuries.
And fourth, that the boat was expected to and did reach the consumer without substantial change in its condition and remained in the possession of the consumer without substantial change in its condition.
“DEFECTIVE CONDITION” DEFINED
A product is in a defective condition unreasonably dangerous to the user when it has a propensity for causing physical harm beyond that which would be contemplated by the ordinary user or consumer with the ordinary knowledge common to the foreseeable class of users as to its characteristics.... [Y]ou must balance the utility of design against the magnitude of the risk.
You will find the Bayliner Buccaneer 180 sailboat to be defective only if it was unreasonably dangerous for its normal use. The normal use of a product includes all reasonably foreseeable uses, including foreseeable misuse.
UNINTENTIONAL TORT-NEGLIGENCE— DEFINED
Negligence is the doing of some act which a reasonably prudent person would not do or the failure to do something which a reasonably prudent person would do when prompted by considerations which ordinarily regulates the conduct of human affairs. It is, in other words, the failure to use ordinary care under the circumstances ....
WARNING ,
Plaintiffs[ ] claim that Bayliner failed to warn that the Buccaneer 180 may take on water through the centerboard trunk and faded to warn that the boat’s safe weight capacity was less than its apparent capacity. Plaintiffs claim that these were dangers which defendant knew of, or should have known of, and which defendant had no reason to reasonably believe that its user would know of.
RECALL
Plaintiffs claim that the defendant was negligent in its conduct of the recall or retrofit of the Buccaneer 180....
4.
The trial court asked the jury for a special verdict, pursuant to Fed.R.Civ.P. 49. The first two questions submitted to the jury were:
1. Did the Defendant Bayliner Marine Corporation manufacture a defective product? _Yes_No.
2. Was the Defendant Bayliner negligent in one or more of the ways claimed by Plaintiffs? _Yes_No.
The jury answered both of these questions “no,” and therefore did not answer the remaining questions, which were concerned with proximate cause, comparative negligence and damages. The trial court entered judgment in favor of Bayliner.
5.
Plaintiffs moved for either post trial judgment as a matter of law, Fed.R.Civ.P. 50(b) (Rule 50(b)), or a new trial under Fed. R.Civ.P. 59(a) (Rule 59(a)). Plaintiffs’ motions centered on the argument that Bayliner did not offer any evidence to rebut plaintiffs’ evidence that the Buccaneer 180 was defectively designed. Bayliner replied that plaintiffs had the burden of proof, Bayliner had raised a question as to the credibility of plaintiffs’ expert witness through cross-examination and had offered contrary evidence, and the jury was free to reject plaintiffs’ evidence even if it was uncontradicted.
[796]*796The trial court ruled that judgment as a matter of law in plaintiffs’ favor was not required:
[although defendant Bayliner did not offer expert testimony to rebut plaintiffs’ naval architect, Bayliner offered proof that the boat was sailed in unreasonably rough water and high winds, for a boat of this size, for an extended period of time by individuals whose judgment was impaired by alcohol and/or marijuana, and that the owner of the boat ignored warnings by a minor passenger that the boat had water in the bilge. In this Court’s judgment, not only was the jury free to disregard the testimony of plaintiffs’ expert, the jury was also free to reasonably conclude that the accumulation of water in the boat was the result, not of any design or manufacturing defect, but of negligent operation of the boat.
Further, since plaintiffs bore the burden of proof, Bayliner “had no obligation to present any evidence whatsoever.” As to plaintiffs’ motion for a new trial, the trial court said that “[pjlaintiffs had the burden of proof by a preponderance of evidence. The jury’s determination that plaintiffs did not carry this burden cannot be said to be seriously erroneous or a miscarriage of justice.”
6.
On appeal, plaintiffs ask that we reverse the trial court’s rulings, find for plaintiffs on the special verdicts, and remand for trial on the remaining issues; or in the alternative, that we reverse the trial court’s rulings and order a new trial on liability and damages.
II.
A motion for judgment as a matter of law requires the trial court to determine “whether there was sufficient evidence presented to raise a material issue of fact for the jury.” Monette v. AM-7-7 Baking Co., 929 F.2d 276, 280 (6th Cir.1991). “The standard remains the same when the trial court’s decision is reviewed on appeal.” Id. Evidence is sufficient to submit to a jury unless, “when viewed in the light of those inferences most favorable to the nonmovant, there is either a complete absence of proof on the issues or no controverted issues of fact upon which reasonable persons could differ.” Id. The court must be careful, however: “the court should neither weigh the evidence, evaluate the credibility of the witnesses, nor substitute its judgment for that of the jury.” Wayne v. Village of Sebring, 36 F.3d 517, 525 (6th Cir.1994), cert. denied, — U.S. -, 115 S.Ct. 2000, 131 L.Ed.2d 1001 (1995). “Only when it is clear that reasonable people could come to but one conclusion from the evidence should a court grant a motion for directed verdict.” Id.
A trial court should deny a motion for a new trial “if the verdict is one that reasonably could be reached, regardless of whether the trial judge might have reached a different conclusion were he the trier of fact.” Id. The trial court may be reversed in its denial of a motion for new trial “only on the showing of an abuse of discretion.” Cathey v. Johns-Manville Sales Corp., 776 F.2d 1565, 1573 (6th Cir.1985), cert. denied, 478 U.S. 1021, 106 S.Ct. 3335, 92 L.Ed.2d 740 (1986). “Abuse of discretion is defined as a definite and firm conviction that the trial court committed a clear error of judgment.” Monette, 929 F.2d at 280.
III.
Plaintiffs present essentially two arguments on appeal. First, they argue that it was improper for either the jury or the trial court to rely on evidence not relating to the design of the Buccaneer 180 in answering or justifying the special verdict questions about defect or negligence. Second, they argue that the trial court erred on the merits by denying plaintiffs’ motions for judgment as a matter of law and for a new trial.
Plaintiffs argue that the trial court should have considered only the evidence regarding the design of the Buccaneer 180 in reviewing plaintiffs’ motions for judgment as a matter of law and for a new trial, and not [797]*797the evidence concerning their actions on the boat. According to plaintiffs, evidence of their own misconduct may eventually go to causation or comparative negligence, questions not considered by the jury, but such evidence is irrelevant to the initial determinations of defect and negligence.
The evidence relating to plaintiffs’ alleged misconduct was not used by the trial court to show comparative fault or proximate cause, but as an alternative explanation for how the water entered the Buccaneer 180. As the trial court said, “the jury was ... free to reasonably conclude that the accumulation of water in the boat was the result, not of any design or manufacturing defect, but of negligent operation of the boat.” There is no error in the trial court’s reference to the evidence of plaintiffs’ actions in sailing the boat.
Turning now to evaluate the answers to the special verdict questions in light of the evidence as a whole, such review of a jury’s verdict is not to be taken lightly. In reviewing a trial court’s denial of a Rule 50(b) motion as a matter of law an appellate court must make reasonable inferences in the non-movant’s favor and ask whether “it is clear that reasonable people could come to but one conclusion from the evidence.” Wayne, 36 F.3d at 525. The trial court’s denial of a motion for a new trial is reviewed for abuse of discretion. The trial court instructed the jury that it should “find ... [the Buccaneer 180] to be defective only if it was unreasonably dangerous for its ‘normal’ use. The normal use of a product includes all reasonably foreseeable uses, including foreseeable misuse.” We must therefore ask whether, making reasonable inferences in Bayliner’s favor, reasonable people could only come to the conclusion that the Buccaneer 180 was unreasonably dangerous for its normal use.
Plaintiffs argue that the jury’s rejection of Sponberg’s testimony regarding the Buccaneer 180 design merits judgment as a matter of law or a new trial. However, as the trial court stated, “[pjlaintiffs’ argument ignores the proper duty of the jury to accept or reject testimony in whole or in part, a duty accurately set forth in the final jury instructions, to which plaintiffs did not object.” The trial court gave the following instructions regarding the acceptance or rejection of testimony:
You should consider each expert opinion received in evidence ... and give it such weight as you may think it deserves_ [Y]ou may disregard the opinion entirely.
You, as jurors, are the sole judges of the credibility of the witnesses and the weight their testimony deserves.... Consider ... the extent to which, if at all, each witness is either supported or contradicted by other evidence in the case.... [Y]ou will give the testimony of each witness such weight, if any, as you may think it deserves. You may in short, accept or reject the testimony of any witness in whole or in part.
If you believe any witness has been impeached and thus discredited, it is your exclusive province to give the testimony of that witness such credibility, if any, as you may think it deserves.
You are not required to accept testimony even though the testimony is uneontradict-ed and the witness is not impeached.
Nor did the trial court err in so instructing the jury. “There are many circumstances in which testimony need not be accepted even though formally uncontradiet-ed,” Sheppard v. Maxwell, 346 F.2d 707, 726 (6th Cir.1965), rev’d on other grounds, 384 U.S. 333, 86 S.Ct. 1507, 16 L.Ed.2d 600 (1966). “[T]he jury is instructed that it is completely free to accept or reject an expert’s testimony, and to evaluate the weight given such testimony in light of the reasons the expert supplies for his opinion.” United States v. 0.161 Acres of Land in Birming[798]*798ham, Ala., 837 F.2d 1036, 1040-41 (11th Cir.1988). As the Supreme Court has stated:
Undoubtedly, as a general rule, positive testimony as to a particular fact, uncontra-dicted by any one, should control the decision of the court; but that rule admits of many exceptions. There may be such an inherent improbability in the statements of a witness as to induce the court or jury to disregard his evidence, even in the absence of any direct conflicting testimony. Quock Ting v. United States, 140 U.S. 417, 420, 11 S.Ct. 733, 734, 35 L.Ed. 501 (1891).3
Thus, the jury could have rejected Span-berg’s testimony even if uncontradicted.
Sponberg and plaintiffs’ other witnesses were not uncontradicted, however. Cross examination of Sponberg revealed that he did not know when the boats he compared to the Buccaneer 180 were built4; the comparison boats were not similar to the Buccaneer 180 in certain details; he did not personally inspect some of the comparison boats about which he testified; he did not note the model of at least one comparison boat; he had never designed, built, nor testified about a centerboard boat before; he did not inspect any new centerboard boats; he did not inquire as to whether any other Buccaneer 180 had ever capsized and he would have been surprised “if there were not other instances”; the fact that no Buccaneer 180 had ever capsized because of water entering the centerboard trunk hole did not change his opinion that the Buccaneer 180 was a very dangerous boat because it was his expert opinion that all centerboard boats are dangerous, regardless of whether or where they have a centerboard trunk hole; he initially denied that it was his opinion that all centerboard boats are dangerous5; the most prominent textbook on the design of small sailboats does not cover the design of centerboard trunks6; he did not know if any other textbooks covered the design of centerboard sailboats and he did not make any effort to look for any; his trial testimony that he “consider[ed] [himjself an expert in sailing the Buccaneer 180” contradicted his deposition testimony that “[f]or that particular boat, no, I’m not an expert in sailing”; it is prudent and [799]*799simple common sense to check the weather before sailing on a large body of water; the Buccaneer 180 did not deviate from any standard of naval architecture7; boats like the Buccaneer 180 are not designed to be watertight 8; and reasonable minds could differ as to the danger posed by the Buccaneer 1809.
Plaintiffs’ other witnesses were also attacked on cross examination. Wolf testified on direct examination that the weather on the day of the accident did not pose a safety risk:
Q. Now, the weather conditions that you have recited or at least the wind conditions that you recited from the Muskegon report, would you believe that they would be suitable conditions for Buccaneer 180s, for boats of that general size and configuration, to sail near the shore of Lake Michigan? .
A. Yes, they would be.
On cross examination, Wolf testified that he would not have taken the Buccaneer 180 out under the weather conditions of the day of
the accident:
Q. Would you have taken a Buccaneer 180 out on Lake Michigan with seven people on board in 15-mile-an-hour winds on three-foot waves and growing on the afternoon of August 31, 1991? Just tell me yes or no.
A. I would not.
Q. Would you have done it besides having had some beer to drink and also smoking marijuana? Would you just tell me yes or no?
Q. So your answer is no, is that correct?
A. Correct.
Wright and Manting, past owners of the Buccaneer 180, both testified that the Buccaneer 180 could not handle the use it was put to the day of the accident. Wright testified on cross examination that the Buccaneer 180 should not have been taken out on Lake Michigan or with seven people and that DeWilde should have checked the weather before going out. Manting testified that the Buccaneer 180 was not designed for four foot waves or to carry seven people. McGuire, plaintiffs’ safety notification expert, testified on direct examination that the notification letters Bayliner sent to owners and dealers about the centerboard trunk hole problem was “defective”. On cross examination, the following colloquy occurred:
Q. Do you know if any other materials, labels, tags, or anything of that nature were sent with either of these two letters when they were sent out?
A. No.
Q. And would your testimony here today change in any respect if it were the case that other materials were sent out when either or both Exhibit 1 and 2 were mailed?
A. Yes, if the materials impinged on that area of testimony.
Q. I see. And you don’t know.
A. No, I don’t.
In addition to directly attacking the credibility of plaintiffs’ witnesses, Bayliner presented testimony of its own. Villalon criticized Sponberg’s test, stating that it did not accurately reflect the conditions the day of the accident: the test did not utilize the Buccaneer 180’s jib, its forward sail; the test used dead weight instead of people; and the test was conducted on an inland lake rather than on Lake Michigan. Villalon also testified as to why those differences might be [800]*800important. Villalon gave his opinion as to the reasons for the accident: the weather report had not been checked; insufficient safety equipment; the use of alcohol and drugs; the failure to notice the Buccaneer 180’s sluggish responses; and DeWilde had taken the boat too far out. Villalon concluded that “[a]ll these sailing dinghies take water one way or another, all of them,” and that “the water must be removed and it is your responsibility to remove the water.” On cross examination, Villalon testified as follows:
Q. And as I understand, it’s your contention that Mr. DeWilde should have been aware that a mistake had been made with his boat and that water was accumulating in the bilge area, is that correct?
A. Yes.
Scarboro, a Bayliner engineer, testified without contradiction that there had never been a Buccaneer 180 that had capsized by reason of water coming through the centerboard trunk. Further, Bayliner “didn’t feel it was a significant safety issue,” in part because of “the nature of the boat, which is really a fairly small boat, which could be tipped over fairly easily and was really only suitable for use on protected waters or areas fairly close to shore.” Finally, Scarboro testified that there were many ways that De-Wilde could have emptied the water from the Buccaneer 180.
Making all reasonable inferences in Bayliner’s favor, the evidence on product defect offered the jury was that the Buccaneer 180 was heavily loaded and was operated in weather that was too rough for a boat of its size and structure. There was no evidence that any boats with Bayliner’s centerboard trunk hole design had ever capsized. And most importantly, plaintiffs’ own expert witness testified that the design of the Buccaneer 180 did not violate any safety standards and that reasonable minds could differ as to the danger of the design.
Evidence was presented which would allow a reasonable person to come to the conclusion that the Buccaneer 180 was not unreasonably dangerous for its normal use. As the jury was justified in finding that the Buccaneer 180 design was not defective, it was also justified in finding that Bayliner was not negligent in its handling of the Buccaneer 180 or its retrofit campaign.
There was sufficient evidence to submit the case to the jury, and “[g]iven the infirmities in the only expert testimony presented by plaintiffs, there was no abuse of discretion in denying a new trial.” Fernandez v. Corporacion Insular De Seguros, 79 F.3d 207, 212 (1st Cir.1996).
rv.
For the reasons stated above, the order denying plaintiffs’ motions for judgment as a matter of law and for a new trial is AFFIRMED.