Barracuda; Innegra S
– Last Updated: Dec-08-10 11:30 AM EST –
Barracuda cloth is aluminized 8 oz E glass, that renders a composite hull that looks like a sheet metal canoe.
Innegra S is a new high density Polyethylene that has characteristics similar to Spectra in weight and strength but laminates more easily and costs less.
The Innegra folks indicate it is used differently than Spectra, particularly in F-1 chassis.
Wenonah's laminate is standard industry protocol; put the Spectra type stuff inside compression layers to get it to laminate, and surely, a layer of 8oz glass will keep the Innegra from floating in resin. Nova incapsulates Spectra similarly.
The Innegra folks contend that The compression layer should be contained within an Innegra capsule.
I've made several test panels when down at Colden Canoe; have several more to work up here in the North Country with Placid boatworks.
Issues are cosmetics and stiffness. Innegra is white and will remain so. None of the panels done at Colden were as stiff as the Carbon/Kevlar/Kevlar control panel but they deformed much farther before failure.
If the next series of lamination schedule tests work as anticipated, Joe will be able to save some three pounds on the current 20 lb SpitFire, a 12'X 27.5" hull. That doesn't seem like much, but it is a 15% weight reduction in completed hull, and that includes an outfitting package, seat, foot pegs and backband that weighs ~ 3 lbs.
So the real skittle weight savings is 17-3=14 lbs; closer to 20% reduction.
Builders infusing hull and integral rails of aerospace materials find few silver bullets left. Innegra may be the next thing, as Vectrane continues to be unavailable, but we're running out of options to build lighter and stronger. And, that's at any price. As DY has said for decades, if you want it light, it will be fragile or expensive.