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Cox Engine identification
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Cox Engine identification
Good day everyone,
I am new to this forum and appreciate all your time. I have a Cox engine with a gear reduction and was wondering if anyone had some insight as to what I actually have.
I have attached a few pictures for review, but am hopeful someone will know right away what this is.
Thanks very much for the ad!



I am new to this forum and appreciate all your time. I have a Cox engine with a gear reduction and was wondering if anyone had some insight as to what I actually have.
I have attached a few pictures for review, but am hopeful someone will know right away what this is.
Thanks very much for the ad!



Sleddin04- Beginner Poster
- Posts : 5
Join date : 2020-10-14
Re: Cox Engine identification
It’s a Kress Technology GP-20 gear reduction unit. This one is mounted to a PeeWee .020 with a helicopter back plate. Was used by free flight guys to swing large props. I have one. It makes it pretty heavy with all that metal mounted on the engine.
Jason_WI- Top Poster
Posts : 3061
Join date : 2011-10-09
Age : 45
Location : Neenah, WI
Cox Engine identification
Thanks so much for that information. I have a few odds and ends that I'm beginning to list on Ebay. Curious about this items value before I list it.
Appreciate your help!
Appreciate your help!

Sleddin04- Beginner Poster
- Posts : 5
Join date : 2020-10-14
Re: Cox Engine identification
I think I paid ~$100 for mine with a throttle ring peewee. Never know with eBay if you get two fighting over it.
Jason_WI- Top Poster
Posts : 3061
Join date : 2011-10-09
Age : 45
Location : Neenah, WI
Re: Cox Engine identification
What I want to know is, what size helicopter was that used on?!?
The Egg Beater Mark
The Egg Beater Mark
batjac- Diamond Member
Posts : 1919
Join date : 2013-05-22
Age : 57
Location : Portland, OR, USA
Re: Cox Engine identification
Cox international did search on that part tink is ad on part for pee wee .020 To run larger prop on particular model
davidll1984- Platinum Member
- Posts : 935
Join date : 2020-02-12
Age : 36
Location : shawinigan
dckrsn- Diamond Member
Posts : 2445
Join date : 2010-10-21
Age : 68
Location : Long Island, New York
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