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Delta & Flying Wings Discuss electric powered delta (flying wing) style aircraft here.

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Old 12-04-2012, 05:55 AM   #1
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Default 60" Dollar Tree foam-board flying wing

This will be a thread on my new wing which I maiden today. The video will be up first in a couple of minutes, then I'll come back and do a description of how to build it.

On Youtube.com http://youtu.be/wlc7jOMWAhc
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Old 12-04-2012, 06:44 AM   #2
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Default Orig wing

This was my first try:


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ID:	164622 The original layout with vertical fins. Blue boxes are doubling for aileron servos.
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ID:	164623 The red is the center section foam that ties the two halves together.
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ID:	164624 I didn't want to use spars, so I made the center foam go to about an inch from the LE, rather than stopping ar 50%.
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ID:	164625 The original motor, camera, and center foam strip.
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ID:	164626 The first motor was mounter on the top of the wing, it was a inrunner and did not keep the magic smoke inside. :^( You can see the five layers at the center of the wing.
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Name:	origlayoutandmotor.jpg
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ID:	164627 The original layout of equipment.
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Old 12-04-2012, 07:03 AM   #3
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The first try flew well with power on, very locked in feeling, but it wouldn't soar because of the drag from the fins. I had 1 1/2" of toe-in in the fins, great for stability, but draggy. I took the fins off and made horizontal wing tips. Now it soared in strong lift, but was a bear to launch because of slow-speed directional instability. I found balls to the wall full power worked, but I need someone else to launch it and it had taken a few good hits learning to go full power. The wing started to fail from this abuse, but I flew it anyway. The wing failed in flight just out board of my doubler pieces. :^(


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ID:	164628 2200 mah battery and new motor.
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ID:	164629 Wing failed just out board of doublers.
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ID:	164630
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ID:	164631 Replacement flat tips.
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Old 12-04-2012, 07:04 AM   #4
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More tomorrow.
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Old 12-05-2012, 07:35 PM   #5
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Default new wing

This is the new and improved wing. I've made the doublers that go behind the LE piece different lengths, the top one goes out to about 4" from the aileron servo, the bottom doubler goes about 4" past the servo. Making the doublers different lengths avoids a hard point in the wing so that any flexing of the wing is spread out. I've not seen the wing flex at all though. I made the firewall differently, the old one I had to guess at straight ahead and at the thrust angle. I made the new firewall a "T" shape, the leg of the "T" alines the firewall to the line of the two wing halves and when laid flush with the top of the wing alines the thrust at 0.
I'm having trouble uploading the pictures but I'll keep trying.


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ID:	164657 Top view of wing. Notice that the doublers go out almost to the servos'
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ID:	164658 The bottom of the wing. The doublers on this side go out passed the servos. I hide the servo wires behind the doublers.
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ID:	164659 The 2200 mah Lipo, RX, speed controller, and motor.
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ID:	164660 The fire wall is lite-ply made into a "T" for a 0° 0° set-up. Cutting the foam away from the prop cuts the prop-noise in halve.
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Old 11-10-2013, 08:00 AM   #6
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Clam shell motor mount: 5 pieces of lite ply, 1st two applied to top and bottom of the wing, 2nd two are "bird mouthed" to the first pieces.
(space according to firewall size) 5th piece is the fire wall

I drew it up poorly but if you click on it it'll get big enough to see


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Old 11-11-2013, 01:28 PM   #7
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I flew this wing maybe 30 times, this is what I've learned:

Dollar Tree foam-board is good for prototyping, but here in New Jersey, USA the humidity is so high that the paper slowly delaminates and the plane dies a slow death.

The design here flies very well without vertical wing tips as long as it is balanced so that you get 3/16 of up trim in the elverons. I think that the trim adds drag at the tips keeping the wing stable.

This kind of wing will always fall out of a slow roll due to no vertical side area, but if you know "that's the nature of the beast" it's not a problem.
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