Use of landing flaps for an 87" Yak

[RogerIngarfield]

Does anyone use the landing flaps setup on a JR DX7 radio for an 87" Yak?

I have a switch on my radio which has 3 settings. The mid setting will leave the ailerons in the neutral position.
In the forward position I could set it up to have an equal deflection of down to both ailerons. That setting will also allow me to couple in some up on the elevator. This setting could be useful to slow the plane down and put it into a slight harrier postion for landing.
The 3rd position of the switch could be used to give and equal amount of up deflection to the ailerons to eliminate wing rock when flying a harrier.

Is this a good idea?
Is this common practice?
If it is, how much deflection on ailerons and elevator?

[jamesrxx951]

it might be a really bad idea. i talked to a gut on a different thread tha did this on a 25% yak and im not sure how much angle he set up but it pitched the nose down really bad. almost lost it. the ailerons are huge on these planes and would act like a huge brake. these styles of planes and land real slow and don't need flaps.

[bodywerks]

If you get wing rock you have a poory designed or poorly set up plane, If you cant get it to slow down for landing then you have a heavy plane, a noseheavy plane, or poor technique.
To answer yourquestion, no, it is not a common practice.

[Black Bird]

	Quote: Originally Posted by bodywerks
	If you get wing rock you have a poory designed or poorly set up plane, If you cant get it to slow down for landing then you have a heavy plane, a noseheavy plane, or poor technique. To answer yourquestion, no, it is not a common practice.

Excuse me,
You also get wing rock from a cross wind and roll dampening. In your haste to judge his situation, you did not answer the other two questions. Yes, it is a good idea to "experiment" with your mixes. Find out which ones suit your style. Can you use them for landing? Ofcourse you can. It is not common, only because they are meant to be used in specific configurations when needed. So, some just opt not to use them. Seven degrees of up ailerons is a good start if you want to augment your landing configuration when flying a "heavy poorly designed" plane with a "good" setup and "average" technique. Use flaps in a no wind condition when landing hot. Use airbrakes in a windy condition to take lift from the wings. Elevator as needed to maintain pitch.

Carry on...

[phippsj]

I have UP ailerons set up on my flap switch as to kill lift to help my plane settle in for landing. It's only 1/4" to act as spoilers.

This in on my 2.6m Extreme Composites Edge. It really does make a difference. Of course, I'm not trying to harrier land. One of my club members does use this method to help harrier (or carrier) land his 3m comp-aft extra.

Using ailerons as flaps in the down position would probably not yield good results.

[Flyfalcons]

A problem with dropping the ailerons for landing is you can increase the wing incidence on the tips more than the root, which could lead to a tip stall when you don't want it. A round-cowl plane like a Yak should have enough drag to slow comfortably for landing.