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HelicopterMain Discussion › Gear Ratio VS Head speed
11-30-2005 11:19 PM  12 years agoPost 1
HeliKopter Ken

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Gray, LA

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I have a Raptor 70 se but today i got a Band new YS 91 in the mail (X-mas I guess). I was wanting to know how do you do the math to figure out what engine rpm, x's gear ratio, for a given head speed. If i want to run engine at 16000 rpm and head speed of 1750 how do i get there what gear ratio. I little lost on this thanks for any help.

Ken

.

Aurora, Raptor 90 FBL, Logo 600SX

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11-30-2005 11:30 PM  12 years agoPost 2
airdodger

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Johnston USA

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16000/1750=9.14 Chris

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12-01-2005 12:05 AM  12 years agoPost 3
hepsibar

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Perth WA

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Just in case your math is not that good-

gear ratio (9.14 etc) multiplied by required head speed (1750rpm etc) gives you your engine rpm.

Empty Coffee Cup

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12-01-2005 12:21 AM  12 years agoPost 4
sharam

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Northern California - Fly at Morgan Hill Field

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IMHO 16,000 for the YS 91 is probably a bit on the high side. You might be safer if you kept it just under 15,000.

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12-01-2005 12:39 AM  12 years agoPost 5
HeliKopter Ken

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Gray, LA

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that was just a example for the engine rpm. i want to take very good care of this engine hard to come by. It Came today. I am tring to figure out what to run as far as gear ratio goes for that head speed i think i have it.

Ken

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Aurora, Raptor 90 FBL, Logo 600SX

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12-01-2005 01:16 AM  12 years agoPost 6
AirWolfRC

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42½ N, 83½ W

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90 / 11 is a good gear set for the YS91 and a head speed of 1800.

Wolfgang

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HelicopterMain Discussion › Gear Ratio VS Head speed
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