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Home✈️Aircraft🚁HelicopterLow Head Speed Helicopters › Gear ratio for low head speed
04-25-2014 02:06 PM  6 years ago
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epryor

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Grandview mo,

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Gear ratio for low head speed
Gear Ratio : 9.3 : 1: 4.6
(Optional 11 teeth and 12 teeth pinion gears are
available to make the main gear ratio into 7.75 and
8.45 to 1 for operation with the 80 and 90 size heli
engines.)
I will be using 800mm blades with a OS91, which of these numbers would be the lowest of the gear ratio for my scale?
Batman - Scale it up
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04-25-2014 03:35 PM  6 years ago
epryor

rrApprentice

Grandview mo,

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Help! do anybody know?Batman - Scale it up
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04-25-2014 03:37 PM  6 years ago
G-Limo

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Europe

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..
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04-25-2014 03:53 PM  6 years ago
xcellgasman101

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WOODWARD, OKLA....

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Your 9.3:1 will be your best of the 3 you posted, 91 engine @ 13,030rpm will get you a 1400HS as stated in your other post.. XGM/VGM

10.0:1 would be better,, it would put your engine closer to target rpm,(14,000) spec. on the 91 is around 15,000rpm @ 3.5hp

This is what happens when you start changing things that were made for a setup, and then changing it to something else that it wasn't intended to do,, There is going to be a give and take somewhere in the mix, Unless you use purpose built items as they are intended to be used... XGM/VGM
John Crotts
www.soonerhelicamproductions.com
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04-25-2014 04:02 PM  6 years ago
epryor

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Grandview mo,

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In that case, I can use the stock gearing in the Raptor 60 which is 9.3:1 Thanks for the help everybody.....Batman - Scale it up
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