aileron differential

[dave9]

sorry if this topic has been asked before may be some one could point me to the correct section on this subject, the problem i am having is just before coming out of a turn i have to give full opposite aileron so the model can fly straight as it finishes its turn, i think its called adverse yaw the ailerons feel a bit slow to
react to inputs. I have about 10mm travel up and down with 2 servos in the wings, i let one of the more experienced pilots fly it
and he said i need less down movement and more up on the aileron travel, trying to think how to do this as i using a dx 5 and can not program this into the set, i was told i could move the the control arm on the servo to a different position to get the correct up and down movement, would just like to know if this how you get around this or is there a different way of doing it.

thanks Dave

[iflyforfun]

Moving the control arm's is the correct way. I would guess that you will want about 50% to 60% of the UP travel for the down travel. For example if you have 22mm up movement you will want to try about 11mm to 14mm for the down. Turn on your system and set all your servos to center trim. Them pull each servo arm off and move them in the direction of the tail.( the tip of the servo arm should be pointing on a slight angle towards the back of the plane.) then measure your differential. Repete the process till you get the travel you want.

Now on to your problem, I dont think that the diff is your problem if you are experiencing an issue coming OUT of a turn. Did you remove the dihedral from the wing? if you have a flat wing you will always have to add opposite control to come out of a turn!!! A stock SC has loads of dihedral and releasing the rudder will cause the wings to level!!!(self correcting) This will be the same even if you have aielrons!! You should have to keep aielron input to the point where you want to exit the turn and by simply releasing the stick the wings should level regardless of aielron differential.

Ifly

[flydiver]

Here's a bit more info on how to do that mechanically. Click on the included link diagrams, they help.
www.modelaircraft.org/mag/ftgu/Part%2031/31main4.html

But, as stated, sounds like you actually have a different problem.

[dave9]

Thanks for the advise just had a play a around with the servo horn position and have a bit of
success, but i have run out of adjustment on the rods so going to make them a little bit longer,
the dihedral is standard, do you know how much up and down movement is recomended for this model thanks

Dave

[flydiver]

You are NOT going to get the described results with dihedral in an aileron high wing. The dihedral is adding righting forces throughout the roll. Those forces and are changing constantly with wing position. No wonder you have wonky handling.

Essentially, mess around with if if you want but don't expect to learn anything concrete about differential handling.

[iflyforfun]

Flydiver posted a great link with instructions on how to test and adjust your setup. Your gonna have to pick a number and start with that.
I still am wondering why you have to initiate opposite aielron to come out of a turn with a stock SC wing.?? I have 2 wings for my SC. One with Flaps,Aielrons,and no dihedral at all(wing is completley flat. My second wing is a stock wing that I put on when my son flys.(he's still learning). I have been giving him hours and hours of lessons and the number one rule is " if the plane is upset in flight in any circumstance and you get nervous just let go of the stick" it always will return to stable level flight(as long as you have altitude.

Ifly

[dave9]

Thanks for your reply and the link for trimming and setting up your model,understanding now the point about leaving the dihedral in the wings going to think about taking most of it out,its just that many people have done this mod and have left the dihedral as standard and commented that it fly fine, i think the other problem was i was flying a much heavier and larger ic trainer just before flying the super cub and i think i was trying to compare it to this model.
Dave.

[flydiver]

People that leave the dihedral in the wing are not able to differentiate 'flying properly' from 'flying fine'. It's kind of a half-step to a flat wing.

It's OK if what you want is self righting and are happy with 'flying fine'. Most new fliers are, and with good reason. If you want 'flying properly' you have to understand the model, the physics, and do the work.

[iflyforfun]

Aug 2, 2011 16:43:30 GMT 1 flydiver said:

People that leave the dihedral in the wing are not able to differentiate 'flying properly' from 'flying fine'. It's kind of a half-step to a flat wing.

I could not have said it better myself!!!! ;D