Prerotator

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MACOWA

Well-Known Member
HBA Supporter
Joined
Apr 19, 2021
Messages
49
Has anyone ever used a small chainsaw motor as a prerotator ? Light, powerful, small when stripped down, and comes with an appropriate clutch. When mounted to the mast top it could be fairly compact.
 

Derswede

Well-Known Member
Joined
Jan 6, 2016
Messages
1,060
Location
Central North Carolina
A friend used a small chainsaw motor to pre-rotate on his Gyro. I will see if I can find any info on it......he passed some years ago.

Derswede
 

Kiwi303

Well-Known Member
Joined
Jul 22, 2015
Messages
357
Location
En Zed. Aka The Shire.
These days I'd probably look at using a E-Scooter motor attached to a cars air con electric clutch, run an ABS ring around the main shaft and a raspberry pi to the hall sensor so if it detects the rotation dropping below X RPM it automatically jumps in to speed it up again. just that extra insurance against slow speed rotor stall in addition to prerotation.
 

jazzenjohn

Active Member
Joined
Oct 22, 2014
Messages
26
Location
Milan, Mi. U.S.A.
Most people I know that went with a engine for a prerotator used a high performance scooter motor. You can get them at Daves Discount Motors. For some good video/pics, look up the superfly gyro here:
or the dragonfly gyro here: The Dragonfly Gyrocopter
 

jazzenjohn

Active Member
Joined
Oct 22, 2014
Messages
26
Location
Milan, Mi. U.S.A.
I'm using a brushless outrunner motor for my prerotator. It's smaller and weighs less, but I don't get quite as fast a prerotation as the best gopeds. 185 vs 220 RRPM or so. I could go with a bigger motor but there are several other considerations that go along with the higher RRPM's.
 
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