Scratchbuilt twin boom

Since the twin booms seem to be the way to go, and I was wanting a payload plane anyway, I decided to build a twin boom.  This is 100% scratchbuilt, even the wing.   I gave it an RC only maiden flight this morning, and it flew like a dream.  Highly stable.  I do plan on adding rudders though, as I want to do some AP work, and require flat turns.  It has a 60" KFm3 airfoil.  The fuse is 5" square (about) on the outside and big enough on the inside to stick my arm in it. The nose has a removable EPP foam panel, I will replace with clear plastic for FPV/AP runs.






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Permalink Reply by ilium007 on July 18, 2010 at 1:34am
Hi Dave - Any luck with getting those plans approved ? Cant wait to build this plane !
Permalink Reply by Dave Buckley on July 19, 2010 at 12:34am
I've been away the past four days, and will post what I have here tomorrow.

Cheers,

Dave.
Permalink Reply by ilium007 on July 19, 2010 at 12:46am
Great !
Permalink Reply by Dave Buckley on July 3, 2010 at 11:32pm
Inspiring work, Tim.

If I can help with CAD work/Blueprints/Renderings please let me know.

fuselage and wing


Partial Assembly




Your article led me to research the Kline-Fogelman airfoils, so thank you again for that.
Permalink Reply by ilium007 on July 4, 2010 at 1:22am
I think I am going to build one of these - do you think it would suit a beginner pilot ?
Permalink Reply by Jon on July 4, 2010 at 4:47pm
yes I think it would be good for a beginner. Its a very stable platform.
Permalink Reply by Tim McMahan on July 4, 2010 at 4:48pm
I think this would be a great beginner plane. It flies very much like the plane I learned to fly on, and could be semi aerobatic if I didn't have so much battery weight. Its very stable in the air, but does bank, unlike a RET plane.
Permalink Reply by Dave Buckley on July 4, 2010 at 4:56am
Could someone help me find a system for attaching a carbon rod boom so that it can be broken down again?
My searches have come up blank. I'm looking for a system similar to the balsa one, but using the round carbon rod or tube.

Thank you.

Permalink Reply by Jon on July 4, 2010 at 5:08pm
if you come up with something can you post it here. I have a system I designed but it needs to be stiffer. heres some photos of what I came up with. I had a friend laser cut these for me. the front piece is a single layer of 1/8" ply and the rear piece is to layers identical to the front and on layer without the hole, to make a cup. then I use a small body pin from an RC car to hold them together.

Jon
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Permalink Reply by Jon on July 4, 2010 at 5:09pm
one more photo of the mount without the CF. I did the same on the tail there just a bit closer together. the mounts ar hotglued into the EPP wing.

Maybe you can add to my idea and we can have a great mount. I want something that breaks down but doesn't take long to assemble in the field.

Jon
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Permalink Reply by Dave Buckley on July 5, 2010 at 1:12am
Have you ground a notch into the CF rod to take the pin?

I thought of putting a pin through the CF rod, but:

1. It can be 'hit and miss' drilling CF rod
2. the action of running a split pin through it could also cause splintering.

I will build a boom box shortly and test my design on it.
Permalink Reply by Jon on July 5, 2010 at 6:13am
yea I forgot to mention the CF rod I used is actually CF with an aluminum sleeve. we get our CF rod from a local archery supply store. he sells us used and miss cut arrow shafts really cheap. these are normally high dollar arrow shafts. with the aluminum sleeves there's no worry of drilling them. after stiffening the wing with a bit of fiberglass and some packing tape its a much firmer mount. but I like the idea of the bolt, I could add a small hole to the current mount to incorporate an end bolt instead of the pin., and maybe use something like a blind nut or maybe get another piece of the threaded insert they use on the arrows for the tips. most of the arrows we get already have a threaded insert on one end, no reason we couldn't add one to the other end. not sure what the thread pitch is on an arrow tip at the moment but I will find out.

thanks, I knew getting some other point of view would be helpful.

Jon

update: I just checked and the threads on the arrow I have with the insert are 8-32. have to get the bolt to the right size tho as the threads bottom out at the bottom so the bolt can't be too long.

Jon

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