CHOPERAMA
Heliman
Location: Bay Area, CA, USA
My Posts This: Topic Forum | Check this website http://rceheli.com/ss/sheet
You can use it to work backwards and see what KV & Voltages you need to achieve the desired RPM and find a motor that fits the criteria. It also have usefull information on how to calculate the effective gear ratio for multiple gearing system like the Graupner.
This is what I have on my Skalar
AXI motor 4130/16
Jeti Spin 77 Opto ESC
Medusa BEC 5V
2 - Zippy 4S1P cell 3500 20-30C (8 cells)
Motor Pinion - 32 teeth
2nd gear - 50 teeth
bottom metal pinion - 15 teeth
bottom main gear - 60 teeth
The gear ratio I input to the Jeti programmer is 9.6 and set at 1,600 rotor rpm. Flying time is around 5-7 minutes at this time (still breaking in the batteries). ESC & batteries barely warm and motor warm.
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