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Old Jan 20, 2013, 08:40 PM
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Will this fly?

Hi guys, first time posting on the forum, though been here plenty of time before.

Anyway. I saw this strange free flight glider while watching an anime, and it just appeared so strange yet so cool. So I'm just wondering, can this model fly if built correctly?



In the anime, it is flying toward the upper right, and the smaller wing appear to be the front

This is only shown in this angle, there are no other view of this plane
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Last edited by bookyle; Jan 20, 2013 at 08:49 PM.
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Old Jan 20, 2013, 10:10 PM
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If it had some dihedral on both front and rear, and the CG was about between the TE of the front and LE of the rear then there's good chance it will.
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Old Jan 20, 2013, 10:27 PM
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if the wings had some back sweep, it should fly similar to the canard designs of burt rutan. the sweep gives similar effects as dihedral, and would simplify building a little bit.

btw, what anime was it in? looks to be cgi and drawn mix, so must be a recent show...
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Old Jan 20, 2013, 10:42 PM
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Some years ago I helped some kids make gliders using a plastic soda straw for the fuselage and stiff paper for flying surfaces.
Some of the best flyers were ones that looked just about the same as the one in your post.
We used the "business reply mail" things you find in magazines for wings, for the vertical tail, and "that small wing in the front" which is called a "canard", the French word for "duck".
That particular paper has a good stiffness-to-weight ratio and so makes good wings and tails.
One thing to keep in mind is that canard designs are VERY sensitive to any "tilt" in the canard relative to the wing. So make sure the canard is level with the wing. If the canard is tilted let's say to the left, the glider will have a strong tendency to turn left,
This is mostly due to the canard having a high wing loading. "Conventional" airplane designs with the tail in the rear are not as sensitive to stabilizer tilt.

So grab some scissors, a sharp blade, a straw or bamboo skewer, and some stiff paper and try this thing.
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Old Jan 20, 2013, 11:47 PM
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Of course it will fly! You'll need to add some dihedral or winglets or sweep, though, for stability.
Here are some models with similar configurations:
http://www.outerzone.co.uk/plan_details.asp?ID=3125
http://www.outerzone.co.uk/plan_details.asp?ID=3327
http://www.outerzone.co.uk/plan_details.asp?ID=3763
http://www.outerzone.co.uk/plan_details.asp?ID=802
It's amazing to me that a model glider in a cartoon is this close to something that would work.

BTW, at one time, the twin pusher canard was the most popular free flight contest airplane. At the time, free flight was pretty much it. They tended to look like this one, except most had built up wings. I built the one in the picture and it flies pretty well. The propellers act like fins, so it doesn't need a fin like yours has.
http://www.outerzone.co.uk/plan_details.asp?ID=2376
http://www.outerzone.co.uk/plan_details.asp?ID=2376
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Old Jan 21, 2013, 01:42 AM
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Thought you might get a kick out of this one:
http://claudel.dopp.free.fr/Les_plan..._Huckebein.jpg
from this page:
http://claudel.dopp.free.fr/Les_plan...ues.htm#x02_dm
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Old Jan 21, 2013, 11:35 AM
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Just a note on the idea of sweep instead of dihedral. Sweep is far less effective. A rule of thumb I've read in more than one location was that 30 degrees of sweep angle is equivalent to around 5 degrees of proper dihedral.

The glider as shown will get SOME degree of roll stability from the tall fin and the fact that on a canard configuration that the center of gravity is well back on the airframe. So if you were to build it exactly as shown it would fly fine if you simply hand toss it into a flat glide.

By adding some dihedral to the rear wing and possibly to the front the model will gain a stronger ability to right itself back to level from odd attitudes. So forming the wings into a V shape with each side at around 5 to 10 degrees from horizontal would be a good idea.

If you want to have a go at this a simple all balsa version that has the wings and foreplane made from 1/16 sheet would be very easy to make in under an hour of your time. I'd suggest that the main wing be 16 inch total span by 3 inch chord. The foreplane could work well at about 7x2.5 inches and the fin be 3.5 inches tall by 2.5 at the base and 1.75 at the top. The fuselage stick can be done nicely from a piece of 1/4 x 1/2 or cut from 3/16 sheet to be around 3/4 deep. The foreplane as shown is mounted on a stubby little spacer which would need to be slightly wedge shaped to give the foreplane around 2 degrees of positive incidence compared to the rear wing. The balance point should likely end up somewhere around 1 inch in front of the rear wing's leading edge.
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Old Jan 21, 2013, 07:46 PM
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Quote:
Originally Posted by derk View Post
if the wings had some back sweep, it should fly similar to the canard designs of burt rutan. the sweep gives similar effects as dihedral, and would simplify building a little bit.

btw, what anime was it in? looks to be cgi and drawn mix, so must be a recent show...
This is from http://myanimelist.net/anime/11597/Nisemonogatari

Pretty good anime
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Old Jan 21, 2013, 07:54 PM
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Wow. Thanks for all the replies. I don't have time to build anything at the moment, being at school and all. But I'll certainly try this when I go home for the summer
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Old Jan 22, 2013, 11:15 PM
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I've built lots of free flight planes without any dihedral and they all fly fine - as long as they're flying straight. If you have enough pitch stability somehow roll stability does not matter much. Where roll stability is required is when you try to trim the aircraft to fly in circles. Without roll stability it will spiral to the ground.
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