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Old 04-04-2010, 05:59 PM
neverending123 is offline
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scratch build profile....

I recently lost me seagull yak .90-1.20, on a failed landing. Wings and tail feathers good, fuse totaled.

Now my question is, I would liketo get some help with bulding a profile fuse. As i plan on using the wings and building in the tail (ele&rud) from the yak. Any tips, tricks, or advice... Or if anyones got a set of plans for a .90-1.20 profile fuse I can buy or down load that would be great, but all comments are also good.

Thanks for your time, and build pics to be posted once build has started.

heres some pics of what I am using:
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Last edited by neverending123; 04-04-2010 at 08:35 PM.
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Old 04-04-2010, 07:27 PM
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Re: scratch build profile....

Justin copy Randys omp
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Old 04-04-2010, 07:43 PM
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Re: scratch build profile....

i think it may be a little big for the wings im going to use but never thought of that.
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Old 04-04-2010, 08:12 PM
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Re: scratch build profile....

Here's a couple of profiles I built. 120 to 160cc powered.

http://www.rcuniverse.com/forum/m_25..._1/key_/tm.htm
http://www.rcuniverse.com/forum/m_66..._1/key_/tm.htm


At the top of the page, click on "gallery" and it will bring up all the pics in the thread into a slideshow.
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Old 04-04-2010, 08:50 PM
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Re: scratch build profile....

mr big them are some really cool looking profiles i can only hope mine can look that good when done
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Old 04-05-2010, 09:07 PM
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Re: scratch build profile....

well i got all the wings un covered and ready to modify for the build.
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Old 04-06-2010, 07:33 AM
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Re: scratch build profile....

Justin just copy Randys an down size it !! use his as a template..
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Old 04-06-2010, 07:54 AM
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Re: scratch build profile....

Almost forgot, the major problem when using a fatty's wing and going to a profile fuse is the that the fuse is tapered, front to back. The root ribs are usually on an angle also. Usually not too much of a problem with a wing that has a tapered leading edge, but with a wing with a straight leading edge won't work unless you redo the root. That's what I had to do on my big Edge.
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Old 04-06-2010, 07:59 AM
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Re: scratch build profile....

Here's a quick drawing of what I'm talking about.
The black and red are the original plane. The blue and purple are what happens when you straighten the fuse.
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Old 04-06-2010, 08:07 AM
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Re: scratch build profile....

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Old 04-06-2010, 10:36 AM
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Re: scratch build profile....

mrbig... i did notice that there is a slight taper to the wings where it would bolt to the fuse. i plan on building to adjust to the taper. but thanks for the info
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Old 04-07-2010, 01:41 PM
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Re: scratch build profile....

ok i got a fuse style picked out to use for my build. Next I'm trying to figure out whether or not to use a carbon backed stick fuse or foam cored. What do you all think?
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Old 04-07-2010, 04:31 PM
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Re: scratch build profile....

foam core is going to be heavy and prone to snap behind the wing. i'd say go foam if it were 80" or larger, but since it's smaller, go stick built with a glass form tube from a kite shop. glass form has flex whereas CF tubes dont have much... and believe me, you want the flex for cartwheel landings LOL
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Old 04-07-2010, 06:38 PM
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Re: scratch build profile....

thanks never thought of that
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Old 04-12-2010, 08:23 PM
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Re: scratch build profile....

well i have started to draw up a blue-print for the yak profile but now i need some help here is a pic of my plans what is in blue is the fuse lay-out. but what i need help with is how do i figure where my main wings (wingtube location) are they on center line of crank if so not a big deal if not how do you figure that out?
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