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27% 260 questions

Old 10-24-2005, 03:13 AM
  #76  
stek79
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Default RE: 27% 260 questions

Hi dick, thank you for the reply!

I have one more doubt: the arm on the rudder servo could be smaller, for example a classic Futaba round arm (the big one)? On the rudder side you could always put a smaller control horn, in order to reach the same (more actually) throw you have on the servo side. In other words, is it necessary to put so big arms? Why can't the setup be done with smaller arms (provided that, as sayed above, also on the control surface side a smaller control horn will be fitted).

Let's imagine that we want 45 deg of throw: since the servo is capable of doing 45 deg, let's suppose we put the servo arm of the same length of the control horns. Now the point is that these lengths can be made larger or smaller, since if kept equal they will give always 45 deg as wanted. The original question was: since we have this freedom of choice (servo arm & control horn length), how should we choose it? Is there an advantage in putting a larger length?

If this can help you, I'm referring to a pattern airplane setup, instead of a 3D one.

Thank you!
Old 10-24-2005, 03:26 AM
  #77  
stek79
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Default RE: 27% 260 questions

One more observation to my previous post: putting a large servo arm you may gain in control surface movement resolution but you are losing servo torque...
Old 10-24-2005, 06:10 AM
  #78  
rmh
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Default RE: 27% 260 questions

To clarify- as long as ratios are held the same -size does not matter -- except--
The exit points easily available in the fuselage, must be considered . By using a long stick, I could plot where a slit in the covering worked out nicely -- this width worked best for me.
Also there is a certain amount of stretch/bending in any tension setup and the longer the throw , the less any varience matters . So- my setup allowed for moderate tension, a perfectly straight shot down either side and no need to cut into any wood.

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