Author Topic: Diy sup foil  (Read 215664 times)

jrandy

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Re: Diy sup foil
« Reply #615 on: February 22, 2018, 06:03:14 AM »
Wow! That is awesome. For some reason I think it needs a Batman logo...
What are you doing for lamination schedules on the mast and wings?
http://pushheretosavealife.com/
Be safe, have fun. -J

supuk

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Re: Diy sup foil
« Reply #616 on: February 22, 2018, 12:05:10 PM »
Wow! That is awesome. For some reason I think it needs a Batman logo...
What are you doing for lamination schedules on the mast and wings?

5layers of 6oz top and bottom on the wings the mast I forget now but as much carbon as possible really, you want it to all be rock solid between the board and the wing.

jrandy

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Re: Diy sup foil
« Reply #617 on: February 22, 2018, 07:18:49 PM »
Thanks guys!
http://pushheretosavealife.com/
Be safe, have fun. -J

surfcowboy

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Re: Diy sup foil
« Reply #618 on: February 22, 2018, 08:34:54 PM »
Ok so now I gotta lay more carbon on my mast lol. I guess if I got it I should use it.

supuk

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Re: Diy sup foil
« Reply #619 on: March 06, 2018, 11:43:35 AM »
Just about finished up the latest Sup foil board so cut myself a little 5’ prone blank this eve

http://youtu.be/ddNGSf5_sjw

jrandy

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Re: Diy sup foil
« Reply #620 on: March 06, 2018, 08:38:13 PM »
Right on Charlie!
Thanks for the inspiration, it helped me to keep going tonight.
I found myself slabbing off some foam for a set of wings.
http://pushheretosavealife.com/
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supuk

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Re: Diy sup foil
« Reply #621 on: March 07, 2018, 02:31:46 AM »
Good work good to see a few outher building there own now. For hotwireing blanks if you use templates like bellow it’s alot easier to get nice leading and trailing edges  and stops things moving around and even easier when you have the cnc to cut the templates and airfoil tools to get your profiles.

jrandy

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Re: Diy sup foil
« Reply #622 on: March 07, 2018, 04:16:09 AM »
Thanks Charlie.

Yes, I got so excited that it came together between Airfoiltools.com and Fusion360 and my general work holding concept and then finding enough scrap to CNC so as not to have to go buy plywood...that I totally forgot about a lead-in and lead-out section for the hot wire. I have recoverd from this in the past by gluing a small extra piece onto the template.

It has me thinking, could one 3D print the airfoil templates provided one used metal bobbins from a sewing machine to keep the hot wire from melting the plastic on the templates? I remember reading on Sway's that some folks use bobbins cored with the tips from a wire-feed welding gun to keep the wire in the center of the bobbin. One would have to figure in the offset from template to foam and from center of bobbin to desired airfoil shape.

http://pushheretosavealife.com/
Be safe, have fun. -J

supuk

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Re: Diy sup foil
« Reply #623 on: March 07, 2018, 05:29:48 AM »
could do I suppose however you would need a good size printer to get it all on. for years I just cut them out of formica or  thin mdf which I sealed the edge with superglue, you can also use thin aluminum sheet just make sure the surface is super smooth so the wire glides nice and you don't get bumps in your foam.

jrandy

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Re: Diy sup foil
« Reply #624 on: March 07, 2018, 04:00:45 PM »
Charlie, do you (or anyone, open mic) see any advantage in cutting wings by moving the wire around he templates with the foam clamped or moving the foam and templates around a clamped wire? The way my work is set up I can do either.
http://pushheretosavealife.com/
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supuk

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Re: Diy sup foil
« Reply #625 on: March 07, 2018, 04:07:39 PM »
I move the wire using the weighted lever method with a series of pulleys you can adjust the speed at ether end to get the perfect speed for tapers, it a comon setup in the rc plane world 

surfcowboy

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Re: Diy sup foil
« Reply #626 on: March 07, 2018, 08:59:58 PM »
Keeping my eye out for a variac and watching this post closely.

Surfside

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Re: Diy sup foil
« Reply #627 on: March 08, 2018, 04:07:35 AM »

jrandy

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Re: Diy sup foil
« Reply #628 on: March 08, 2018, 04:41:20 AM »
I think I am going to take Charlie's advice and play out the lead-in and lead-out of the template.
It is pretty easy to do in CAD as the geometry is there, it just needs to be tweaked.

The variac in my pictures is from work. I am not sure if I'd do a variac or lab power supply if I were to set up to do more of these.

I read up on the model airplane rigs. They seem neat, much like a parallel rule in drafting, but more pulleys and baubles than I want to do right now. So I think I will clamp the work and start in the middle and pull towards the edges.
http://pushheretosavealife.com/
Be safe, have fun. -J

supuk

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Re: Diy sup foil
« Reply #629 on: March 08, 2018, 04:54:13 AM »
If you can get a second pair of hand the best way to do the taperer is to mark each end in to 1/4 or 1/8 segments the call out to each other when you get to each one so you can keep in time and get to the Le at the same time. If you don’t you tend to get a curve in the profile simarly if you go to fast the wire will drag and you will get a curve in your surface.

 


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