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Old 05-26-2010 | 09:02 PM
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From: Euharlee, GA
Default RE: Black Magic VF3 Build Thread

My control throw meter measures in inches...I found this formula in another thread on how to convert degrees into inches:

ORIGINAL: scratchonly

Double the width of the control surface; eg 2" surface = 4"; multiply x 3.14 =12.56. Divide by 360 =.035. this is your inches per degree. 20 degree throw=..035x 20 = about .7 inch or between 5/8 and 3/4 inch. This will certainly be close enough.
This is all based on the circumferance of a circle which is 3.14xdiameter. Be sure to double the width of the surface.
Read more: http://www.rcuniverse.com/forum/m_44...#ixzz0p5dxqSt6



So for me wanting 8 deg low rates and 12 deg high rates on the elevator I came up with:

Elevator Chord = 4" (I used the largest chord...Since it's tapered you want to be sure and use the same spot to set your gauge that you measured for the calculations... )

8 x 3.14 = 25.12 / 360 = 0.0697 (inches per degree which I rounded off to .070)

.070 x 8 = .56" for 8 degrees of throw

.070 x 12 = .84" for 12 degrees of throw


I know this is very basic Trig but I'm dumb and I couldn't remember way back to school so I had to go look it up...

Hope this helps...

Chuck