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Home✈️Aircraft🚁HelicopterBeginners Corner › Help with Motor RPM w/ Century Helicopter
04-26-2009 06:56 AM  10 years ago
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nrad2000

rrVeteran

USA

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Help with Motor RPM w/ Century Helicopter
At full throttle - how fast in RPM do the os 50 hyper spinning?

At full throttle - how fast in RPM do the 1100kv motor w/ 6s spins?

- 800kV w/ 8s?

I'm thinking of turning one of my hawk pro (50) into an electric. I was thinking of using the Century 800kV motor w/ 8s Lipo and use the largest Pinion Gear that Century has (15 tooth). I'm wondering what kind of head speed this would give me. I'm planning to put this into a scale helicopter so crazy head speed is not necessary.
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04-26-2009 11:54 PM  10 years ago
FlaG8r

rrElite Veteran

Florida

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http://www.readyheli.com/Online_Hea...ulator_s/81.htmLife is tough, it's tougher if you're stupid
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04-27-2009 12:04 AM  10 years ago
Gearhead

rrMaster

Vt

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EDITED again
Ratio between Counter Gears and Bell Gear,

53 Counter Gear... Ratio 2.038,
55 Counter Gear... Ratio 2.115,

Ratio between Drive Pinion and Main Gear,

13/60... 4.615
14/60... 4.285

Final Ratio with Head Speed and Engine RPM

55/13/60,, Final> 9.763,, 1639... 16,000,,, 1741... 17,000
53/13/60,, Final> 9.408,, 1701... 16,000,,, 1807... 17,000
55/14/60,, Final> 9.065,, 1765... 16,000,,, 1875... 17,000
53/14/60,, Final> 8.736,, 1831... 16,000,,, 1946... 17,000
Jim
Buzz Buzz Buzz
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