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04-09-2011 09:58 PM  6 years agoPost 1
halliday

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england

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hi can any one work out my head speed using zenoha rc 270 with gearing
164/ 27 i dont know how too work it out also what gear ratio does that make it many thanks HALLIDAY

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04-09-2011 11:43 PM  6 years agoPost 2
mcp_x

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NY - USA

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Hi halliday

for the ratio divide the number of teeth on the main gear by the number of teeth on the pinion , in your case this would be 164 / 27 = 6.07

to figure engine speed , head speed

your headspeed times the ratio = engine speed

and your engine speed divided by the ratio = headspeed

so if you tach the headspeed at 1600 RPM you could figure your engine speed by 1600 X 6.07 = 9712 engines RPM

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04-09-2011 11:48 PM  6 years agoPost 3
fastflyer20

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N. Tonawanda, NY

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HS vs Engine RPM @ 6.07 ratio

1,850 = 11,237
1,900 = 11,541
1,950 = 11,844
2,000 = 12,148
2,100 = 12,756

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04-09-2011 11:51 PM  6 years agoPost 4
theriddick45

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United States

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To calculate gear ratio you simply take you main gear and divide it by you gear tooth. Example....167/27 = 6.07 gear ratio. This gear ratio is low but it will depend what kind of flying you want to do etc. If your motor is stock check your manual for maximum Rpm then you can calculate your head speed. If your motor MAX RPM is let say 12500 choose your head speed and multiplied by your gear ratio of 6.07. Ex 2000 X 6.07 = 12,140 RPM on your motor.

Hope this help.

Suzi Janis 800e & 700e 3blade both w/Ikon

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04-10-2011 04:29 AM  6 years agoPost 5
rbort

rrProfessor

Franklin, MA - USA

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Your gear ratio is too low to be ideal

You need to try to keep the head speed within 1800 rpms and be at the max engine speed by then otherwise its going to be hard on the motor to maintain the speed during maneuvering.

But like others said, just multiply your 6.07 gear ratio by the head speed you choose to run to calculate engine rpms.

-=>Raja.

MA 1005 Hanson 280, 4136 flts
Spectra 27 3DMax, 3200 flts
Whiplash V1 Hanson 300, 1430 flts
Whiplash V2 Hanson 300, 196 flts

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04-10-2011 02:41 PM  6 years agoPost 6
theriddick45

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United States

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The question I have is. Are you using the stock main gear and a custome gear tooth? 27 doesn't sound right to me since aling have a 20 And a 14 I guess that's all. If so you could get a 25,24 or 23 for better gear ratio.

Suzi Janis 800e & 700e 3blade both w/Ikon

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04-10-2011 02:48 PM  6 years agoPost 7
rbort

rrProfessor

Franklin, MA - USA

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If you have these options

With the 164 main gear that you spoke about then get a 24 tooth pinion that would be my best choice.

-=>Raja.

MA 1005 Hanson 280, 4136 flts
Spectra 27 3DMax, 3200 flts
Whiplash V1 Hanson 300, 1430 flts
Whiplash V2 Hanson 300, 196 flts

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04-10-2011 04:37 PM  6 years agoPost 8
halliday

rrNovice

england

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head speed

hi the main gear is gman 164 and 27 pinion hope that helps halliday

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04-10-2011 05:40 PM  6 years agoPost 9
theriddick45

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United States

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this is the gear ratio you will get...
164/24= 6.83
164/23= 7.13

Either will be good but it depend on flying style. 6.07 to my personal opinion is to low.

Hope this help

Suzi Janis 800e & 700e 3blade both w/Ikon

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