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Old Sep 01, 2009, 03:34 PM
the answer 42 is
Switzerland, AG, Lenzburg
Joined Jan 2006
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Question
4 control surfaces Flying wing???

Hello

I m planing to build a new 1.6m Flying wing and looking around I found out some using 4 control surfaces (2 elevevons + 2 flaps) Does anyone have information about this?? it will really work?? or is just better to have the elevons??

thanks for your input

EZ
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Old Sep 01, 2009, 05:38 PM
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Joined Jul 2008
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I have build a 2.5 meter wing span flying wing, And use 4 control surfaces.

The wing is very nose heavy for now.
I have an other topic running on this forum and have been told that calculated cg is not necessarily the "actual cg". And as far as i can see now(rain, no powered test flight) they are right about it.

But back to the 4 control surfaces:
The outer 2 surfaces are used for "up/down" and "left/right" at all times.
the inner 2 surfaces are hooked to a switch on the remote to aid the outer 2 surfaces in "up/down"
They are also hooked to a second switch to be used as flaps.
If I trigger the flap switch the inner 2 surfaces move down 50 degrees and the outer surfaces move up an extra 4 degrees.

At this setting I can flip the flap switch at any speed.
* If the speed it to high she will just pitch up a little.
* If the speed is just right she will slow down very quickly.
* If the speed is to low she will slow down until there is almost no control left. Your 90+ granny could walk aside and be faster

I created her to be a powered wind sailer.
Wing span is 2.5 meter
The control surfaces go right to the end of the wing (where i mounted the fins)
5 centimeter space between the two inner flaps and the prop/motor.
And an other 5 centimeter between the outer 2 control surfaces and the flaps.
The flaps are one 5th of the size from the outer 2 control surfaces.

Why flaps?
I have to land in a very limited space.
And as she is designed to be a glider she glides a fair bit.
So to be able to land her in the limited space have, I needed her to slow down alot. thus the solution was flaps.

Some times I use the flaps high in the sky to slow her down when i hit a nice thermal up stream.

I hope i have given you a start on the 4 control surfaces question.
if not let me know
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Old Sep 01, 2009, 09:07 PM
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Quote:
Originally Posted by Edwinzea
Hello

I m planing to build a new 1.6m Flying wing and looking around I found out some using 4 control surfaces (2 elevevons + 2 flaps) Does anyone have information about this?? it will really work?? or is just better to have the elevons??

thanks for your input

EZ

Swept wing or a plank?
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Old Sep 01, 2009, 09:14 PM
Mum is the word!
Joined Jun 2003
6,793 Posts
Here is a thread where Matt has built one of my zephyr thats like what you are looking for.

http://www.rcgroups.com/forums/showthread.php?t=1098938
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Old Sep 01, 2009, 10:00 PM
the answer 42 is
Switzerland, AG, Lenzburg
Joined Jan 2006
1,904 Posts
Hey MDKme thanks for the info, Im plnnig to build something small but with the same ideas in mind,
DT56 yes sweeep

I will keep you posted on my developments


EZ
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Old Sep 02, 2009, 03:59 PM
An itch?. Scratch build.
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South Wales U.K.
Joined Mar 2003
13,773 Posts
Perhaps a little too large

The Hump, 3.5 meter span.

Used elevons, flaps, and an air brake.

The air brake was important to get it down, and 'dialing in', (pot control on the Tx), small flap changes could be used for some trim and speed changes, but not used very often.
The flaps could have been used for braking, but a big 'barn door' air brake worked really well at dumping height without increasing speed.
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Old Sep 05, 2009, 12:41 PM
the answer 42 is
Switzerland, AG, Lenzburg
Joined Jan 2006
1,904 Posts
wooow that is big

EZ
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