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HelicopterFuel-Helicopters New or Limited ActivityGraupner › gearing for Elektro skaler
03-16-2009 07:37 AM  8 years agoPost 1
Phoenix Flyer-2

rrNovice

Adelaide, Australia.

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Hi all.
I have a mate who has been building a elektro skaler.
He is running a 22t pinion and would like to know what is the best motor for the heli.
Also he would like to know what the gear ratio between the head and the motor.
Cheers
thanks for any help
Hamish

Logo 600 vbar | Beam E4-A mini vbar | Futaba Fasst on a 12z

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03-19-2009 02:18 AM  8 years agoPost 2
CHOPERAMA

rrNovice

Bay Area, CA, USA

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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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