Boat Building Forum

Find advice on all aspects of building your own kayak, canoe or any lightweight boats

Re: Carbon: Here are the Sail Mag numbers
By:Ted Henry
Date: 11/4/2003, 4:07 pm
In Response To: Re: Material: Is Carbon Fiber really light (revisi (Paul Probus)

Hi Paul,

Below are the numbers presented in the 11/2002 Sail Magazine article written by Dave Gerr (excluding the e-glass/mat/olyester figures):

Tensile strength (PSI) for CF, S-glass, and E-glass respectively, all using epoxy:
61,000 71,000 46,000

Modulus (E) psi:
7,300,000 3,200,000 2,800,000

Strain in/in:
.0084 .0222 .0164

Modulus of resilience (u) in. lb./cu. in.
255 788 378

Seeing those numbers only helped me a little. It was Gerr's accompanying commentary that made is so much more clear. My objectives are to build a relatively light kayak that is still tough and durable. Those are rather subjective words, I know. Based on my test samples, if I were to use the commonly available 6 oz CF on the inside of my hull, the boat would not meet my weight objectives. The extra stiffness provided by CF is not necessary, and the reduced "resiliency" is not desirable in the unlikely event I were to crash heavily into a large pointy rock.

Hope this helps,
Ted

Messages In This Thread

Material: Is Carbon Fiber really light (revisited)
Ted Henry -- 11/4/2003, 11:39 am
Re: Material: Is Carbon Fiber really light (revisi
Mike and Rikki -- 11/6/2003, 1:06 am
Re: 2x2 weave?
LeeG -- 11/8/2003, 8:29 am
Re: 2x2 weave?
Mike and Rikki -- 11/8/2003, 12:28 pm
Re: Material: Is Carbon Fiber really light (revisi
Ted Henry -- 11/6/2003, 12:01 pm
Re: Material: Is Carbon Fiber really light (revisi
Mike and Rikki -- 11/7/2003, 12:27 am
Stiffness is where CF excells
Jack Sanderson -- 11/4/2003, 10:08 pm
Re: Stiffness is where CF excells
Mike and Rikki -- 11/6/2003, 1:31 am
CF Boom
Jack Sanderson -- 11/8/2003, 12:32 am
Re: CF Boom *NM* *Pic*
Jack Sanderson -- 11/8/2003, 12:35 am
Re: Stiffness is where CF excells *Pic*
Jack Sanderson -- 11/8/2003, 12:25 am
Oceanplanet
Sam McFadden -- 11/8/2003, 1:10 pm
Re: Stiffness is where CF excells
Mike and Rikki -- 11/8/2003, 1:54 am
Re: Stiffness is where CF excells
Paul Probus -- 11/5/2003, 1:14 pm
Re: Material: Is Carbon Fiber really light (revisi
mike loriz -- 11/4/2003, 7:52 pm
Auto Racing Helmets and Cloth Types
Jim Eisenmenger -- 11/4/2003, 6:07 pm
Re: Material: Is Carbon Fiber really light (revisi
Sam McFadden -- 11/4/2003, 4:29 pm
Re: Material: Is Carbon Fiber really light (revisi
Paul Probus -- 11/5/2003, 1:28 pm
Fundamentals
Sam McFadden -- 11/6/2003, 12:06 am
Re: Material: Is Carbon Fiber really light (revisi
srchr/gerald -- 11/4/2003, 3:05 pm
Re: Material: Is Carbon Fiber really light (revisi
Paul Jacob -- 11/4/2003, 11:55 am
Re: Material: Is Carbon Fiber really light (revisi
Ted Henry -- 11/4/2003, 1:09 pm
Re: Material: Is Carbon Fiber really light (revisi
Paul Probus -- 11/4/2003, 11:52 am
Re: Material: Is Carbon Fiber really light (revisi
Ted Henry -- 11/4/2003, 1:05 pm
Re: Material: Is Carbon Fiber really light (revisi
Paul Probus -- 11/4/2003, 2:40 pm
Re: Carbon: Here are the Sail Mag numbers
Ted Henry -- 11/4/2003, 4:07 pm
Thanks for the numbers, Ted, NM *NM*
Paul Probus -- 11/5/2003, 1:12 pm
Re: Carbon: Here are the Sail Mag numbers
LeeG -- 11/4/2003, 4:21 pm
Re: Material: Is Carbon Fiber really light (revisi
Kyle T -- 11/4/2003, 1:02 pm
Re: Material: Is Carbon Fiber really light (revisi
Paul Probus -- 11/4/2003, 2:54 pm
Re: Material: Is Carbon Fiber really light (revisi
Nick Schade - Guillemot Kayaks -- 11/4/2003, 3:54 pm