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ProModeler Scorpion Power
HelicopterThunder TigerRAPTOR 50 › Gear Ratio " HELP"
06-06-2010 09:02 PM  7 years agoPost 1
Raptor Freak

Senior Heliman

Auburn, Wa

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I have a lot of different main gears for the Raptor i Have a 93T 86T and 85T i also have the pinion gear for a 30 size but i want to install an O.S .50 but want to keep it as the short boom conversion. Does anyone know what main gear and pinion gear i should use? I have a 12T Pinion Gear. Will the 12T with the 85T Work for the 50 size engine?

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06-06-2010 09:10 PM  7 years agoPost 2
Richie Sabin

Senior Heliman

Niagara Falls, NY

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Optimal gear ratio for the 50 is 10t pinion 85t main gear

Rich Sabin
Team Align
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Morgan Fuels
Hatori Mufflers

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06-06-2010 09:11 PM  7 years agoPost 3
Raptor Freak

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Auburn, Wa

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Even if i was to keep it with the short boom and 550 blades?

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06-06-2010 10:43 PM  7 years agoPost 4
mundo330

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Holly Springs, GA, USA

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The Larger pinion gear will speed up the head. The rotor size does not make a difference in the rotor rpm. The smaller rotor disk should be able to take a little more rpm for a given blade density, putting less stress on the head but you need to use common sense here. 10/85 or 8.5 ratio is optimal for most 50 engines. If you are using a long stroke like the old Enya you could go up a tooth or two to match the lower engine rpm with the same head speed.
Hope this helps!

Causality is the Root of all Life!

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06-07-2010 12:23 AM  7 years agoPost 5
Raptor Freak

Senior Heliman

Auburn, Wa

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Thankyou very much for the information. i will get the proper pinion gear.

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HelicopterThunder TigerRAPTOR 50 › Gear Ratio " HELP"
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