Forums > Windsurfing   Western Australia

fin mold

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Created by pepe47 2 months ago, 6 Mar 2018
pepe47
WA, 1070 posts
6 Mar 2018 6:06PM
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Have to express my gratitude to Elmo today for his help in my efforts in my first venture in urethane moulding. Absolutely stuffed the first attempt but with some useful tips I think I can rectify the mould itself. I'm trying to replicate Fangy's fin in a carbon / glass and silicone carbide foil. Needless to say the attempt was a learning experience. If you don't make any mistakes in life, you're not learning anything.
cheers, mate

elmo
WA, 7703 posts
6 Mar 2018 9:53PM
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Just call me Egor Maaaaster

col5555
WA, 270 posts
7 Mar 2018 1:00PM
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If you can get CNC code for the fin mould I may be able to get it CNC cut in SE Asia

pepe47
WA, 1070 posts
7 Mar 2018 6:49PM
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Igor, you evil bastard, third attempt.

pepe47
WA, 1070 posts
7 Mar 2018 6:56PM
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Great idea Col, We'd need to get the fin scanned. I have no idea how to do it as I've done it by eye. But any help would be welcome

pepe47
WA, 1070 posts
7 Mar 2018 9:28PM
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ok, now we have a mold that is up to the standard. (took three attempts and there was no way I was giving up) . The advice from Elmo is spot on and even though I've had 47 beers the job turned out great. Happy Lad!


pepe47
WA, 1070 posts
9 Mar 2018 7:10PM
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So, after my third attempt, it's been a bit of a success. Not completely sure my neighbours like the sound of the router any more but, it had to be done. Both sides done and it's starting to look like a split mold..

AUS 808
WA, 219 posts
12 Mar 2018 4:31PM
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Select to expand quote
pepe47 said..
Great idea Col, We'd need to get the fin scanned. I have no idea how to do it as I've done it by eye. But any help would be welcome


I believe Fangy has the CAD files so should be simple to get moulds cut.

pepe47
WA, 1070 posts
22 Mar 2018 2:48PM
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AUS 808, the cad that Fangy has are for his fins, mine are a little different. Like his, the chord ratio is still 8% through the profile, however I've made the fillet shorter as I believe it's done it's work on entry and may not be needed at the rear. This may of course be completely wrong, but after testing I found it worked, and worked well. Mine are carbon, which may be lighter but do not wear well, especially where the sand particles are suspended in the weed. I'm trying to coat the leading edge (in the mold) with silicone carbide which Elmo had success with. 6 months of wear and tear and the leading edge looks like one trip to Albany. However, after handing me a jar, he had an evil snigger happening, which I'm sure has to do with final sanding.
Anyway, I've made three of them, a 24cm, a 21 and a 19. The leading edge is 49 through to 53 degrees, which should of been 51 but ended up at 53 from some estuary bed profiling. Why mess with mother nature...





decrepit
WA, 8225 posts
22 Mar 2018 6:28PM
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Looking good Paul.

Swindy
WA, 161 posts
22 Mar 2018 7:33PM
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Looks amazing, wish I had your skills.

Windxtasy
WA, 3786 posts
23 Mar 2018 7:49AM
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another work of art, Pepe!



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"fin mold" started by pepe47