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HelicopterGasser Model RC HelicoptersOther › 8.42 ratio on gasser
08-09-2016 01:28 PM  15 months agoPost 1
epryor

rrApprentice

Grandview mo,

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14t/118t = 8.42 is that right? I'm looking for low head speed on a 270rc gasser which is going in to a scale body, I'm trying for 1500rpm or a little lower.

Batman - Scale it up

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08-09-2016 02:27 PM  15 months agoPost 2
fastflyer20

rrKey Veteran

N. Tonawanda, NY

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Yup, that's right. So your engine RPM will be 12,640. Is it modified or stock? If it is stock, you may want to have it balanced to decrease vibes.

I like the ratio, you could go lower with the HS if you want and still have reasonable RPM's for the engine.

Tom
CAUTION - my posts are based on my experiences, yours may be different.

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08-09-2016 04:46 PM  15 months agoPost 3
epryor

rrApprentice

Grandview mo,

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Yes, it is a stock motor.

Batman - Scale it up

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08-11-2016 07:36 PM  15 months agoPost 4
epryor

rrApprentice

Grandview mo,

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I had to go with a 14t/115t,that give me 8.21 ratio with a engine rpm around 12,315 with a head speed of 1500. the gearing on my gasser now 10.25 ratio with 800mm blades, do you think the 8.21 ratio will work? the mechanics is a Trex 700 helibug stretch to 800 size.

Batman - Scale it up

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08-11-2016 07:57 PM  15 months agoPost 5
fastflyer20

rrKey Veteran

N. Tonawanda, NY

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Yes, slowing down the stock engine by 300 RPM's should not make a big difference.

Tom
CAUTION - my posts are based on my experiences, yours may be different.

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08-11-2016 08:26 PM  15 months agoPost 6
epryor

rrApprentice

Grandview mo,

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Good! that will work

Batman - Scale it up

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08-12-2016 01:34 AM  15 months agoPost 7
rbort

rrProfessor

Franklin, MA - USA

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Slow it down as much as you can

The slower the better for stock engines due to vibes, will be smoother slower.

-=>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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