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Old Apr 15, 2014, 10:23 AM
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Joined Apr 2014
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Building a wing from salvaged sailplane parts! First build I do by myself!

Hello everyone,

As this is my first post I'd first like to say that the RCgroups website was really a big booster on getting to want to build my wing. Really enjoyed surfing the site and seeing all those projects coming to light with tips and help from the community.

I've always loved flying crafts and my family and I used to build them some when I was a kid, we built two from scratch and those both crashed after a flew flights, they were motorised gliders, and I'd now like to build a wing, as their nervousness and power in flight was always something that left me in awe.
The last motorglider we built I got most the parts from, that one wasnt built from scratch and was assembled from a pre-made kit. It was an Aspire RTF EP. The motor appears to be a "500-600"motor, it's pretty big, and weights 230 grams.
I have some questions about the motor:
- How much power does "500" mean? There are no indications whatsoever written on the motor...
- This motor was intended for a glider, meaning, it's not supposed to always be on, but rather procure a large amount of power to the airplane for going back up, then being turned off so the plane can go fishing for that warm air, Will this large motor be appropriate for the flying wing I intend to build, or will it be too powerful, and thus consume the batteries charge straight away, Would it suffer from heat buildup because of prolonged use (I don't want the foam to melt mid-air!)
Now a few questions about the wing itself:
- I'm going to build this from kadapak foam, it's an architectural modeling foamboard widely used here in france and i've got load of it, I'm pretty sure it's going to be alright, it's like blue foam but has paper on each side so as to give it a nice finish.
- Seeing as i'll be sporting probably about 600grams of hardware, (motor, battery, and servos), what kind of wingspan should I be looking at? I'd like this wing to be on the nervous side but still stable in sturdy winds...

In terms of airfoil profile; the MH32 seems to be looking good from comments I fished here and there on the rcgroups forums, but i'm not sure, anybody have experience willing to share with this airfoil?

One of the builds i was planning on copying was this:
"The Thrifty 30" Scratch-built RC Flying Wing for under $35 (4 min 42 sec)


But adding, 30% more wingspan, he seems to have a really small motor and battery for a small wing, seeing as i'm using some oldschool tech, I figure I should be giving more wing proportionally.

Lastly: my sailplane had a folding prop, which is obviously no good, any advice on what kind i should be getting?

Thanks
Louis.

I'll be updating this post as I get more salvaged hardware, today's acquisition was an old 2ch command from a tamiya RC car i'd built being little. I hope to salvage the receiver from it to handle the wings servos but i just realised: I need three channels: 2 for ailerons and one for thrust... Or do I?
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Old Apr 15, 2014, 01:08 PM
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Joined Apr 2014
11 Posts
Hey everyone,

After a lot of searching, i'm totally lost in finding the right wing for me...

Plank style? Delta wing? Symmetrical or asymmetrical airfoil?

I'm not leaning towards anything at the moment except that I know this:

-This is my first foam build, and so I'd like an airfoil/wingtype that's going to be relatively easy to build, but still fly straight.

- I'd like something that's not too hard to get flying on, and that can support the heavy payload it will carry rather slowly, so that I can get to know my aircraft, and my flight capabilities.

If there are any wing veterans out there that can help me out in choosing the right buildtype, I'd greatly appreciate it!

Thanks,
Louis

Edit: I'm thinking maybe something like this, simple to build and using old-school batteries like the ones I have

http://www.rcgroups.com/forums/showthread.php?t=682098
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Last edited by Babibab; Apr 15, 2014 at 01:18 PM.
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