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Peter Miller26/06/2020 10:19:47
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Sorry about that. It is flat calm in Suffolk but going to be pretty windy over the weekend.

Martin McIntosh26/06/2020 10:50:27
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Teach you not to try a maiden with the flaps down! These need testing at height first.

Tim C26/06/2020 11:23:34
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Ground handling was generally good, particularly as there is a steerable tail wheel. Flaps or not, turning in the wind in either directions it just flipped over, it was gusting 18+mph.

Peter Miller26/06/2020 12:23:00
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Well,what do you expect with a wind of 18 mph!!!disgust

Martin McIntosh26/06/2020 15:49:49
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Mine can have a mind of its own on take off and needs to be exactly into wind. Slightly off and full aileron and maybe some rudder is required to get it on track but once going it is fine.

bees01/07/2020 16:52:17
133 forum posts

Eventually the weather was ideal to maiden the Cub. Did not go well at all and iam completely baffled by what happened. No wind , did the usual range check, checked all controls for the right deflection and everything was okay. Took off gained some height and gave some right aileron and nothing happened if there was no control at all but managed to land safely by pure luck. Doubting myself did another range check and gave the ailerons a little more movement and tried again but to my surprised would not turn right so gave it some left aileron and she turned rather sharply due to the extra movement i added but once again my luck was in and managed to land it but ended with a broken prop so that was the end off my session. I have built a lot of models in my day and most of the time they have been successful but this episode this afternoon has really got me baffled.

Trevor01/07/2020 17:41:31
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I had one model that behaved like this. You may find that it will turn right if you back off the throttle. If so, try a smaller propeller. A bit more right side thrust might also help but reducing the torque is better than fighting it!

Peter Miller01/07/2020 18:13:58
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That is the first time anyone has experienced that one.

I have no side thrust on mine.

Martin McIntosh01/07/2020 18:14:36
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Sorry to hear about your continued problems. Mine is powered by a SC30 FS which is about right, but with all the motor weight up front the cg is 55mm from the wing LE, and that is without fuel. It also has a fair bit of right thrust, about 2 deg.

Aileron travel is: low rate up, 12mm. High, 14. Low down, 10, high 12.5. This is how I originally set it up.

The wing has very little dihedral so should respond to ailerons reasonably well but this is not always the case. You could try mixing in about 30% rudder. A Lancaster for instance cannot be flown on aileron only, you just get adverse yaw and it will not turn. I have done a couple of o/d Cub lookalikes in the past which responded (or not) in a similar manner.

On the maiden of mine it swung left and I nearly broke the stick willing it to straighten up but it did. That was on low rate. I now know the nature of the beast and can fly it with confidence. It was flown at the Buckminster Fly In last year in a crosswind.

I would say that some right thrust would help you. I only have a 10x6 prop. so on leccy you may well be using a larger one which would give more left torque effect.

Peter Miller01/07/2020 18:20:11
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Mine uses a 13X6 high performance wood propeller as per George at 4-Max. It does not like a smaller prop

bees01/07/2020 21:07:31
133 forum posts

Mine also has a 13x6 prop and motor from 4-max. In all my years model flying i have never experience anything like this. I have a 3d fokker that will not turn by ailerons alone, rudder is the only wait will turn. At first i thought i had no signal but managed to land but it did the same on the second flight again no control regarding right input but plenty of left turn.

bees01/07/2020 21:09:47
133 forum posts

Forgot to mention, i had already added some slight down thrust and right thrust before the first flight.

Peter Miller02/07/2020 08:15:52
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Most peculiar!!!

So far no one else has had this problem and I do not have any side or down thrust on my model.

Tim C14/07/2020 18:16:39
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Video clip of maiden attempt

 

not a success, took off then abrupt turn left and no effective roll control, Even with rudder. 2nd flight hairy after some fiddling with aileron settings, no damage, assessing options as to what next

Edited By Tim C on 14/07/2020 18:19:59

Peter Miller14/07/2020 18:23:59
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I can't get the video to work.

Tim C14/07/2020 18:37:56
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Peter Miller14/07/2020 18:55:41
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THat looks as if the CG is far to far back/ Just where is the balamce point?

ken anderson.14/07/2020 18:57:29
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i reckon the c of g needs to go forward...weight in the nose reqd..

ken anderson...ne...1...c of g dept.

Peter Miller14/07/2020 19:11:51
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Move the balance point (CG ) forward to 25% wing chord. IT is forward of the one shown on the plan but will stabilise the model.

Tim C14/07/2020 19:12:19
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I tend to agree, the cg set on the Rcme plan mark which is fwd of that on Peters hand drafted plan, I have added some nose weight about 55gm, but have yet to put the wings on to check on the cg balancer. I have also checked for any trimming issues which give a left bias, as was unable to check any trimming on the test flights

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