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150 Class Electric Helicopters 150 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 01-04-2017, 02:30 AM   #41 (permalink)
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Join Date: Jun 2014
Location: Taiwan
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Quote:
Originally Posted by nightofcarnage View Post
Any one have tips on measuring +/- 10 on collective pitch. Only thing that pop to my head is using the blade length, distance between blades facing in same direction and distance from the ground to each blade and do some trigonometry. I should be able to figure out each blades angle and come up with a table. Anyone else have any other ideas.
There is an app called RC-Heli-Pitch for Android in Google Play store.

It uses your tablet/phone camera to take a picture at maximum pitch, with the blades folded 90 degrees, like a scissor, and will calculate the angle for you, after your set the blade length (120 mm).
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Old 01-04-2017, 10:38 PM   #42 (permalink)
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Join Date: Jul 2007
Location: chicago
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Thanks, but the math is so easy

D1 = distance for blade 1 to table
D2 = distance for balde 2 to table

BL = Blade length is actual 123 mm

A = ABS((D1 - D2)/2)

angle = arcsin(A/BL)

so to get 10 deg you need a distance for 42.7174 mm between the blades.

Its a easy calculation


Here is a quick dirty table

------------------------
| angle | distance in mm (A) |
------------------------
|0|0|
|0.5|2.1467277326|
|1|4.2932919835717|
|1.5|6.4395292837368|
|2|8.5852761888152|
|2.5|10.730369291873|
|3|12.874645235764|
|3.5|15.017940725575|
|4|17.160092541055|
|4.5|19.30093754905|
|5|21.440312715924|
|5.5|23.578055119975|
|6|25.714001963843|
|6.5|27.847990586905|
|7|29.979858477666|
|7.5|32.109443286133|
|8|34.236582836176|
|8.5|36.361115137884|
|9|38.482878399897|
|9.5|40.601711041727|
|10|42.717451706065|
|10.5|44.829939271068|
|11|46.93901286263|
|11.5|49.044511866631|
|12|51.146275941169|
|12.5|53.244145028773|
|13|55.337959368591|
|13.5|57.427559508553|
|14|59.512786317518|
|14.5|61.593480997393|
|15|63.66948509522|
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