Schmidty721
someone turf my rails
- Location
- WI
Are you saying it is thicker that your ski boat? I'm just going off of where I made my cuts on the hull. Without the core I bet it would be half that thickness.
Freestyle Hull construction.
- Thread starter Brian_216
- Start date
Idok
F1pro
- Location
- Nations oldest muthaF+++kin city
consider solid cloth..no core
- Location
- Harveys Lake PA
Definitely going that direction. Maybe some strips of coremat in some spots, but not throughout if any at all.
I'm just curious about the different properties of carbon, Kevlar and glass. It would be interesting to get feedback about different combinations used and why one would chose to.
- Location
- New Jersey 732
Plenty of good books available from Barnes and Noble that you should definitely read through as they are a ton of help and will answer most of your questions.
- Location
- Lake Martin, Alabama
im just about to start testing with some panels... I think some of the layups may surprise you, but i do not plan on a standard core
but really the test are just to help me come up with an educated guess b/c once you build one and find out what the issues are you dont know what your looking for in the test!
most my test will be a mixture of carbons and also adding a special kevlar in the middle...
but really the test are just to help me come up with an educated guess b/c once you build one and find out what the issues are you dont know what your looking for in the test!
most my test will be a mixture of carbons and also adding a special kevlar in the middle...
How are you planning to test your experimental panels?
Idok
F1pro
- Location
- Nations oldest muthaF+++kin city
check out the USS ROOSKI thread
- Location
- Lake Martin, Alabama
big hammer!!!
Hulls load material primarily in bending. Bending strength can be increased without adding weight through the use of cored panels or a network of stringers. Balsa is the most efficient core but susceptible to rot over time. Rohacell and PVC foam wont rot but is more expensive and has less compression strength. Nomex and aluminum honeycomb is very expensive and not practical for marine applications. A solid laminate panel places all the load on the resin instead of the fiber. The finish on the fiber is most important in this application. Carbon is light weight and adheres to resin better than glass so it is stronger and lighter for a given thickness, just incredibly expensive. Kevlar makes a great rope or flak jacket, thats about all its good for since it doesnt adhere very well. Read the books first, the science is old and readily available. The most difficult problem is knowing which material and technique is best for the application.
- Location
- Lake Martin, Alabama
Im wanting to test my panels using a press and pressure transducer, see how much it takes to break and also compare pressures giving a pre-set preload... I was also thinking of doing a twist test. Others could learn alot even from bending by hand i think.
Carbon= strong and stiff, light
Kevlar= strong and flexible, abrasion resistant . Higher resin content
S-glass= lots of qualities like kevlar but much cheaper
I think building strength and stiffness with the carbon and sandwich kevlar to add flex, the kevlar will not be an entire core...
mainly in sections like stringers.
If you're going to do any kind of quantitative testing that produces hard numbers, ie not hammer/bending by hand, PLEASE make sure you neck down the part so that you create a fail point. I've watched professional composite guys certified by the FAA test repairs and when they do their testing the parts always fail at the mounts. Then they can't understand why their test data isn't even close to their calculations. See the crude drawing attached for an example of necking down the part. Hope it helps...
Attachments
- Location
- Lake Martin, Alabama
That makes perfect sinse... Thanks