RCU Forums - View Single Post - Flight controls power requirements and servo sizing
Old 12-01-2009 | 12:43 PM
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olnico
 
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Default RE: Flight controls power requirements and servo sizing

ORIGINAL: tassos p

And now that I have done this how can I simulate on ground the air forces on the surfaces? I mean how do I calculate the weight required to stick on the surfaces to simulate as close to reality as possible the forces exerted on the surfaces (like you did on the Phoenix in the last RCJI)

Tassos
This is explained in post 4 and 5 as well as in the article.

The important output data for this computation is Fp max. This gives you the weight that the system is seeing at the control horn distance given in Yc.
On your example, for the aileron we have 7,6 lbs for Yc= 5,9 cm.
This means that at 200 mph, a full deflection of the control surface ( the aileron here ) will generate an effort of 3,44 kg at 5,9 cm from the surface rotation axis.

So for the torture test you will have to put 3,44 kg of weight at 6 cm from the control axis of the ailerons.
For the endurance test, you'll have to put 1 kg at 6 cm from the control axis ( corresponds to 20% aileron deflection at full speed )

For the flap, I think that you need to rework the simulation a little bit. It does not look close enough from the UL configuration...