Below is a chart illustrating the manner which each material behaves when loaded.

The fiberglass is blue, Kevlar is magenta and carbon is yellow.

Note how the glass and carbon reach their peak load and then simply fracture. The kevlar begins to go elastic early and develops load gradually; the initial stiffness(slope of the line) is greater than glass however.

Too cool, I love this ****e.

"Kevlar 49"
 

"Kevlar 49" as it was first known did not come out untill the mid/late 1970's. Often on this board we see boats claiming to be constructed of Kevlar-and they are not! Byer beware.

ttt. One more round. :)

Re: "Kevlar 49"
 

Actually Magnum was using Kevlar in the late 60's , mine was produced in 68 and when I went to get the deck, the factory confirmed the hull was made of Kevlar. They new exactly which hull I had and confirmed it. Maybe mine was an experiment or something, I don't know, but it is what it is.

I have a 42' Harley that is constructed of Kevlar with foam coring. I have beat this boat hard without one stress crack anywhere. I have to say this is the toughest boat I have owned. It weighs in at 14,000 lbs dry. I think that that is pretty good for a boat this size.

It is fully loaded with gen set, teak cabin, etc etc. Still can get a honest 50 mph with a couple of high time 410hp 502's. I don't think this would be possible if it was made of glass.

origonally developed in 1965 by dupont

http://www.dupont.com/kevlar/

I stand by what I stated! Kevlar was not used in boats untill the mid/late 1970's. Perhaps Brownie can help with this?
www.carbon-fiber.net/aramid_comp.html

The second paragraph, "Kevlar was developed in the 1970's..."

I also had a 1967 28' Magnum Race boat, Aronows original "Maltese Magnum". This boat is fiberglass. Why wouldn't they have made Aronow's boat out of "kevlar" if it was available? According to Rich Powers-they only used "polyester resin" (with fiberglass) back then.

Is there any way to tell if a Top Gun is Kevlar or not? 1991

Brian Hollis of Joker Powerboats is using Kevlar in his boats, maybe he can chime in here. Any thoughts Brian???