How to build scratch planes.

[Mr. Pimp]

I want to build a bipe flying wing using a 380 brushed motor and a 900 mah NiMH battery. I want the wing span around 30". Any designs on building scratch planes what-so-ever are welcome.

Thanks for any help.

Sincerely

-Mr. Pimp :cool:

[ghoti]

Do you really mean two wings and no tail? I have never ever heard of such. Wow, what a strange idea! Bill

[Mr. Pimp]

Yeah, I thought the same thing too. But there is a thread on bipe flying wings in the flying wing section. For example the Wright Brother's plane was a bipe flying wing. Here is a link somebody gave me of pictures of the Burgess-Dunne flying wing bipe. http://www.ctie.monash.edu.au/hargrave/dunne.html

Sincerely

-Mr. Pimp

[Ollie]

"How to build scratch planes."

My advise is to:
1. Get plans.
2. Buy materals.
3. Add craftmanship.

;)

[ghoti]

That Dunne machine is truly a flying wing biplane and the photo knocked my socks off! Well done. Notice the heavy sweepback that makes it possible. There must have been som reflux built into that wing? Is that the right word?

On the other hand, I consider the Wright flyer a canard, not a flying wing. It had a seperate elevator in front that took care of the pitching moment produced by their non swept back wings, no? Bill

[JetPlaneFlyer]

For example the Wright Brother's plane was a bipe flying wing.

I'm sure the foreplanes on the write flyer were there for more than decoration :rolleyes:... As suggested above I think you will find that the Wright Flyer is a canard.

A swept wing tailess bipe is one thing but a straight wing 'plank' bipe would be something else altogether (if this is what was intended). It may be very difficult to prevent violent pitch changes due to minor variations in aerodynamic forces acting on the upper and lower wing.... I'm not saying it can't be done but there are lots of potential difficulties.

Mr Pimp....Were you thinking of a straight or swept wing?

That Dunne machine is truly a flying wing biplane .........There must have been som reflux built into that wing? Is that the right word?
Close!... its 'reflex'... With swept wings they would probably use wing twist (washout) to achieve the correct trim instead of (or together with ) reflex... In fact if you look at the 3-view drawing and the photo of the replica you can clearly see the twist.

[Sparky Paul]

Get one of the Wattage TM350 3D kits.. build it without the horizontal.
Reflex the (now) elevons a bit.
Move the c.g. forward..
And get back to us.. :)

[nmasters]

There must have been som reflux built into that wing?

Nope. Just sweep, twist and blended camber. Control was by elevons at the tips.

[miniphase]

to quote Jupp Wimmer, builder of this model

'flys....... but not recommended'

[Lon Enloe]

"How to build scratch planes."

My advise is to:
1. Get plans.
2. Buy materals.
3. Add craftmanship.

;)

Heck, skip step 1--make up your own. You learn a lot when things work out, and even more when they don't. :)

[Thomas B]

The Easy Riser biplane ultralight/hang glider is another example of a tailless swept biplane flying wing:

http://www.ultralighthomepage.com/PICS/easyrise.gif

There was a French tailless plank winged biplane as well, bult by Rene Arnoux:

http://www.century-of-flight.freeola.com/Aviation%20history/flying%20wings/europe_interwar.htm

There are at least one or two more out there.

[BMatthews]

The Burgess Dunne actually has a whopping big amount of wing twist in it. On a swept flying wing the twist substitutes for reflex. Reflex in the airfoil itself is only needed for plank style flying wings where there's very little or no sweepback angle where twist can work with you.