Talking About Adventure In Small Boats
Bermudaboy
Member
Wishful thinking here....
New Raceboard arriving soon... anyone have following left over from any project for a good price (better than ebays) for following, like to put internal storage boxes in the new one, prior to NCC...
9 yards of 50" 3K 2x2 Twill Weave Carbon Fiber
&
2 Sheets of .5” (or 1/4") x 24” x 48” Nomex Kevlar Honey comb,
or
2 Sheets of 3/8” x 24” x 48” Divenycel
Cat5
Member
https://www.sollercomposites.com/Carbon-3K-Fabrics.html
I don't know what eBay prices are like but these guys were recommended to me. I haven't bought from them because of the hassle and expense of importing to Canada
danceswithmullet
Member
I don't have any free stuff but just got 2 yards of 6 ounce 2x2 twill from ebay. $66 to the door and a cheap shipping tube that was damaged. Everything is ok but sollercomposites looks like a much better deal. That's a lot of high end stuff and shipping foam is expensive. When I build stuff I usually kind hybrid stuff. A mix of light glass and carbon fiber. The glass is a lot more flexible so I do a first layer in that, fillet or radius any hard edges then use the carbon fiber. If you screw up there are less tears over wasted carbon fiber. I just glassed 2 stringers in an old sprite last night with blueboard foam and 8 ounce fiberglass tape. I will probably throw a layer of carbon for sexy factor. I will cover a rudder today with carbon fiber. More for sex appeal than strength but man it will be sexy!
Cat5
Member
I'm not sure how you guys are using the carbon fiber, but it's not always the best solution. This guy explains it much better than I can...
https://youtu.be/j7bQYEt_qtU
Bermudaboy
Member
C5, I actually watched his videos a few times... very fascinationg, for my storage boxes, strength and stress are not such a big issue, what I am really am aiming for is rigidity, so board hull remains super stiff box to stearn. in chop and when beating upwind.. AND FOR the least posssible addition of the ENEMY (weight), Thatz the reason I go with the kevlar nomex....I only use one layer of the 50" 3K 2x2 Twill atop and below the nomex honeycomb,. With this the board is stiffer than without the storage boxes, you can easily feel the difference in the ride... BTW I found normal Nomex (not Gilmore Kevlar) on amazon for sale in race shops as radiator protectors, sizes are limited but pricing is reachable... BTW, I am going to order the twill from the shop you recommended in NH... Cheers
danceswithmullet
Member
Burmudaboy have you done this in the past? If you have then I guess you are familiar with the difficulty of working with some of these materials. I don't like kevlar because there is no sanding out imperfections. Even the carbon fiber is tough on tight edges. I finished my rudder and I am happy with the results but overkill on a 10ft dinghy that will be used for drinking beer and maybe some light buoy racing although built stout enough for the challenge. DWM
Bermudaboy
Member
DWM, yea its the exact same surgery I did about this same time last year on the black Exocet Raceboard I was on in March. I think did pretty good job for first time, but the seaming of the deck hatch while perfect structurally, was not satisfactory appearance according the the gripings of the mirror minows and squids that would was up on the deck.
Just to clear up, the matt I use is just carbon fiber, no kevlar! and this is what sandwiches the core honeycomb nomex for the walls, floor and deckplate top ?- or whenever years ago when we did EC on Prindle 19, I used kevlar/carbon combo matt, to strengthen the necks of the rudders for crossing FB,, and it was miserable to work with every crawl of the way....so I agree! The nomex honeycomb core I probably mistakenly believe comes in two types, the normal and the nomex kevlar version, both are very easy to cut and trim, etc, As Kevlar type is considerably stiffer and much lighter (see belwo) than the normal nomex, but to me both appear visually the same.. (or someone has lied to me about selling the Kevlar one and sending me the normal) . Both from a legit intergalatic distributor, are beyond the budget of a mere earth-based triber who wants to remain married. Anyway, I have not idea if my ranting is correct or not, as I have just gotten information off the net... as below...
Kevlar is the newest addition the honeycomb line. It is an extremely lightweight, high strength, non-metallic honeycomb manufactured with para-aramid fiber paper (DUPONT Kevlar® N636 or equivalent). The para-aramid paper is impregnated with a heat resistant phenolic resin. This core material exhibits improved performance characteristics over Nomex® and Korex® in the areas of weight, strengths, stiffness and fatigue.
danceswithmullet
Member
Sounds like you know what you are doing. I made a colossal mistake a few years ago when I made a foam core hardtop for my Navy whaleboat diesel to electric conversion. The front top section was 16x8 ft after a seal coat I handlaid laminated 2 layers of 6 ounce glass. When I knocked off at 0130 and collapsed into bed it looked like a perfect surfboard. When I woke up the foam had continue to absorb the resin causing about 1/3 to delaminate. To add insult to injury the resin passed through the foam to glue it to the framework of the form. It was a bad day!
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