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HomeScaleAircraftScale HeliScale Helicopter Main Discussion › Vario Schweizer 300
05-26-2015 02:35 AM  3 years agoPost 1
crflyer

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Maine

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I have a Vario Schweizer 300 with a 3 blade head and newly broken in G240rc engine.
What head speed should I be running?
The gear ratio is 4.14.
Thanks

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05-26-2015 01:08 PM  3 years agoPost 2
Notar

rrKey Veteran

Taxachussetts

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Your gear ratio is actually 9:1 in that heli. Its two stage gearing, so you must take both gear ratios into account.
You want 1200rpm on the head for that heli.
Joe

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05-26-2015 03:45 PM  3 years agoPost 3
crflyer

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Maine

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Thanks Joe

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05-26-2015 04:12 PM  3 years agoPost 4
Mojave

rrElite Veteran

Palos Verdes, Ca. USA

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Yup, that heli flies great on 1200 rpm HS. Here's a pic of mine on E-Power.
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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05-27-2015 12:59 AM  3 years agoPost 5
crflyer

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Maine

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How do you figure the gear ratio with 2 stage gearing?
Thanks

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05-27-2015 07:42 AM  3 years agoPost 6
goodhunting

rrVeteran

Slovenia ... somewhere in Europe

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Figure the 1st stage and then multiply with the 2nd stage...

Ex of my Skyfox...

1st stage
53 t main / 20 t on motor (of clutch)
2nd stage has internal gearing with 40t and pinion with 10t

1st stage = 2,65
2nd stage = 4

total gear ratio: 1st x 2nd stage = 10,6

gh

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05-27-2015 05:37 PM  3 years agoPost 7
crflyer

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Maine

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That's very helpful
Thanks

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