delta wing with flaperon

[kaos]

Never flew delta wing till my Skyfun recently. Finally got it tuned up and fly well now. One thing pop up in my head. Can we add a flaperon in delta wing? if so, how? and what fly character I would be experiencing once the flaepron is down? similar to normal plane's flaperon?

Here is a vid of my Skyfun flying last wkend using Ersky9x. By the way, the good news is the fly club i am joining obviously accept Flysky/er9x... without any issue. I was showing a few people who have been long term members there my Sky9X Tx with all the bells and whistles. Surely popped a few eye, one of them even asked if he can get a Sky9x board any more. told him -no but Taranis is available. He pulled out his cell phone and looked at the Taranis and tell me straight in the eye: I am going to get one.

http://www.youtube.com/watch?v=DfNb5txI28s

[gohsthb]

Wouldn't flap eron be the same thing as elevator on a wing? If you have 4 moving surfaces I think you can do brakes, but that would be all on a wing.
-Gohst

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[kaos]

I think flaperon is using aileron as flaps while maintain the aileron functions so the aileron is lowered when activated to increase float during landing but still has some aileron function. But, delta wing like Skyfun has only 2 ailerons (2 wing surface only), no elevator, no rudder, just using the delta mix on both aileron to perform ailron, elevator and rudder function. Actually there is no/little rudder function, you turn by tilting the wing and elevator to turn (bank and yank). This is why the question popped in my head, what happens if I use flaperon on a delta wing.

[MikeB]

You get down elevator!

Mike.

[jhsa]

if you lower both surfaces your wing will dive to death because as Mike said you are giving down elevator command

The mix for that kind of aircraft is normally called ELEVON, which is a mix between aileron and elevator..
I guess you could also call it "ailevator" but it's not as elegant..

[kaos]

I see. now if I put an elevon in there basically the nose come up but the lift is actually reduced? so flaperon/elevon really does not work well with delta wing?

[jhsa]

elevon is the mix you used to mix elevator and aileron on the aircraft. it's not something extra.
basically Delta shaped wings don't need flaps as they can fly at greater angle of attack and slower than conventional wings.. I hope I'm not starting an argument here

João

[gohsthb]

conventional wing being one which is constantly follow by something called the tail of an aircraft, which typically includes an elevator and rudder control.
-Gohst

[jhsa]

forgetting the canard??

[gohsthb]

Canards are just normal planes that fly backwards!

[jhsa]

[Flaps 30]

Wouldn't flap eron be the same thing as elevator on a wing? If you have 4 moving surfaces I think you can do brakes, but that would be all on a wing.

How about split Elevons... You could split the Elevons chord wise and have the top surfaces controlled by two surfaces and the underside controlled by another two servos. To apply brakes/flaps you would arrange for both the upper side servos and the underside servos to pull toward the nose for the full braking effect.. You could do a space shuttle on the rudder if you so wish..

Personally I would have thought that given the normal characteristic of a delta to loose airspeed and a fast rate of knots, when it has no or little power applied and the nose pointed upwards, that the need for some form of drag device wouldn't be needed.

[kaos]

yep, I think if really a 'flap' is needed, i need to split the aileron to two halves, one for flap/elevon, one for aileron. (may be flap30 / aileron70 )
this is just a thought pop into my head to see what else I can fool around with a delta wing.
but an airbreak may be a good idea to slow down the delta before landing, you saw I over shot the landing strip.
where on a delta wing to place an airbreak is a better choice: top, bottom, both sides?


ghoshb: I think I will get a canard in the future to fly backwards just program 'rev' for throttle.

[gohsthb]

a B2 stealth bomber looks like it uses a split aileron to also do a rudder effect. By applying the brake on only one side the aircraft turns.
-Gohst

[kaos]

Darn, you are getting ideas for me get more planes. I am already run out of 20 model memory on ERSKY9X.

[gohsthb]

That's easy to fix, just crash a few, then you will have more room. Works that way in the hangar (err garage) too.

[kaos]

but I always end up fixing them back up again, that is how I end up with 6 450s.

[MikeB]

Try 32 model memories, coming soon!

Mike.

[jhsa]

How many for the m128?

[kaos]

Yeah!!!!!!!!!!!!!!!! Thank you MIKE!!!!!!!!!!!!!!!!!!!!!!!!!!!!


edit: just out of curiosity, why 32? is that a bit/byte number?

[Flaps 30]

but an airbreak may be a good idea to slow down the delta before landing, you saw I over shot the landing strip.

Yes I saw that.. Read the last paragraph of my previous post. Try to come in on final raising the nose a bit more than what you did before. You should find that the speed bleeds off very fast as the AoA increases, in fact you may need more power to stop it sliding back.. Try it at height first ... Maybe you might need a bit more up elevon than you have at present to get the nose up far enough, as the elevons tend to become less effective as the AoA increases, due to the blanketing effect of the wing..

You could always go for another method of landing your aircraft ---> http://www.youtube.com/watch?v=CAwET3Q9Og4

[kaos]

working on it. Last time I was testing how slow I can fly this thing, at about 4 ft high came to a stall and dropped like a rock and broke the nose off and the canopy into 5 pieces. Took me all night to glue that curvacious canopy back together. Need a plastic surgeon to fix the nose better.

the high alpha approach is a little worry to me. This plane came as a grass lander, no wheels. those wheels are my own addition out of a set of wheels I have in the drawer. With a 6x4 prop on the tail and not too high a landing wheel, it is on my mind with high AOA the prop may hit the ground before the wheel.

Better idea, remember this one is going to be VTOL.