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Comper CLA-7 Swift

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Bernd Lewerenz22/02/2019 14:06:01
346 forum posts
200 photos


Bernd Lewerenz22/02/2019 14:06:38
346 forum posts
200 photos


Bernd Lewerenz22/02/2019 14:07:19
346 forum posts
200 photos


Bernd Lewerenz22/02/2019 14:20:53
346 forum posts
200 photos

Last sunday was my 70th birthday and the first flight of the comper after a few changes..Some improvements were necessary.

at first a stronger engine with 9x6prop instead of 7x4. The lipo is now 2200mA instead of 1000mA.

The angel ofattack is reduced of 0,5 degrees instead 1,5degree.I would be very happy about a couple of comments.

kc22/02/2019 19:45:46
6207 forum posts
169 photos

Looks very nice in the air Bernd. Have you now reverted to the original plan alignment of tailplane and wing?

Bernd Lewerenz23/02/2019 07:45:00
346 forum posts
200 photos

No, I did not. She flyes very nice.The only negative thing is: THe tail hangs slightly down when turning.

Maybe the flat tail unit will be the reason.The point of ballance is right. The model is with 1200g

very light. It flies best without wind.But on my flights there was wind at 14km per hour.We will see.

Denis Watkins23/02/2019 08:00:01
4057 forum posts
75 photos

Beautiful aeroplane Bernd, dropping its tail in the turn is reminiscent of the Piper Cub

The solution is to fly the tail round too, with a touch of coordinated rudder, together with the aileron input

Or just mix 50% rudder with aileron for initial tests

Bernd Lewerenz23/02/2019 09:01:53
346 forum posts
200 photos

Hi Denis,

thank" for your help. I will mix rudder with aileron as recommended by Philip Kent also with 50% step by step.

It is always the same story. I need several flights with a new model, until all problems are elimated.

But that is the salt in the soup in our hobby, we say in Germany.

Piers Bowlan23/02/2019 10:00:57
1993 forum posts
53 photos

Excellent build log and beautiful model Bernd.

Hanging the tail in the turn is a classic symptom of adverse yaw, where the roll produced by the ailerons is countered by their asymmetric drag causing adverse yaw. Setting differential ailerons so that the up going aileron has more deflection than the down going one is one fix. This can be achieved mechanically if you have only one aileron servo or electronically through your transmitter when you have two. Some (most) full sized aircraft have frise ailerons designed to increase drag on the up going aileron as an aerodynamic fix for adverse yaw. On some model aircraft the adverse yaw can be so bad that the aircraft is reluctant to turn with aileron alone so rudder is always required.

Using coupled aileron and rudder (CAR) is also a fix as the rudder will produce positive yaw in the direction of the turn so countering the adverse yaw produced by the ailerons. Personally I think it is best to try and get rid of the source of the adverse yaw first by using differential ailerons.

Bernd Lewerenz23/02/2019 17:04:25
346 forum posts
200 photos

Hi Piers,

Today I did some test flights again.According to your recommendation I have increased the aileron differentiation step by step.Now I have 55% differentiation and the tail does not hang. Together with a mix rudder to aileron 50%

the comper turns fine.So flying makes fun right now. Thank"s to all who helped me with building and flying the Comper.Thank"s also for backround information to Nicolas Comper.Hope, we can keep our contact in this forum.


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