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Correct Mechanical Advantage

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Correct Mechanical Advantage

Old 10-13-2007, 11:21 AM
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thunderbolts
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Default Correct Mechanical Advantage

Can someone give me a definative answer on "Mechanical Advantage"?? I want to get this right when I set up my controls on a new airframe.

I think I have an idea of whats required but some of the pictures and setups I have looked at seem to contradict what I have read.

Thanks.
Old 10-13-2007, 11:38 AM
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DMcQuinn
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Default RE: Correct Mechanical Advantage

Use the maximum throw on the servos. This is a transmitter setting, typicallly called travel adj (on JR). JR Radioa express this as a percentage. From the factory, the transmitter is set to 100%. Change this to 125 or 140%.
Use a short arm on the servo or use one of the holes near the axis.
Use a long arm on the movable surface.
set the length of the pushrod so that it is at 90 degrees to the arms on both ends.
If you have enough movement of the surface, you are done. If however, you don't have enough movement, you must compromise some mechanical advantage for more movement. Put a longer arm on the servo (or use a hole further from the axis)
Old 10-13-2007, 12:10 PM
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thunderbolts
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Default RE: Correct Mechanical Advantage

Thanks for the info. As I thought. It looks like some examples I have seen pictured have used more of a compromise than others.

Thanks again TB
Old 10-14-2007, 06:12 AM
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WB2SXN
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Default RE: Correct Mechanical Advantage

Here is a good explanation from the Horizon Hobbies web site

http://www.horizonhobby.com/Articles...ArticleID=1192

WB2SXN

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