[quote=bradinjax][quote=bradinjax][quote=charlescarlis]Awesome - thanks, Brad.
What IS your laminate schedule? I'd be using Dow high Load, I think and definitely hot wire cutting because my rig is automatic and makes perfect cores every time.
So, from what I can garner from pictures, a high aspect ratio rudder is preferred to the elliptical? That actually makes it WAY easier to build and more accurately. I was thinking on the order of: foam: 6oz satin, 6 oz satin, CF uni-strips run vertically, 4 oz, 1.5 oz on outside, vacuum at whatever mark that sharpie mark is at and post cure @ 110f for 6 hours. Lay out the layers of cloth across each other, 90 degrees for torsion control and put in hard points where the bolts come through (just hardwood dowels). My current favorite is Pro Set epoxies (have some that's 6 years old and STILL sets up as if new- but consider it "play material" now).
I pretty much know I'm going to fiddle with this at this point - will share pics and methods as I go.[/quote]
I slightly modified the schedule I got from the original manufacturer. On the board that works best I did a 4" wide strip double layered on the bottom and running top to bottom centered on the chord using 6oz plain weave fiberglass mat and West System. Then 3x layers of 2 oz and West. Each layer was bagged. Then finished by hand fairing and white gel coated.
I am told 3x layers of 2oz properly vacuum bagged is 2x stronger than a single layer of 6oz.
That schedule is a complete overkill for most beach cats. The centerboard fits a Stiletto 27 beach cat that weighs around 1400lbs and it just has one centerboard, not 2 like most beach cats.
I think if I had used something like a tri-weave aramid/kevlar/carbon fiber composite material I would just do a 4oz strip in fiberglass and 2x layers of 2oz tri-weave with no gel coat.
Because of the 6oz strip on the chord the finished profile thickness is about half way between the Eppler E836 and the NACA 0009 shape in total thickness. That is still significantly thinner than the stock board.
Other specs: the centerboard is 7ft long, 14 inches wide and weighs about 65lbs. A replacement board costs 2K for that boat. I estimate that I made mine for about 500$.
The hardest part was getting the foam shaped. After two failed attempts I paid a local surfboard shaper to do it.
Brad
Stiletto 27 CEEdited by bradinjax on Sep 07, 2018 - 09:50 PM. [/quote][/quote]
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