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Cox Engines Forum

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Post  Sleddin04 on Wed Oct 14, 2020 11:11 am

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!
Cox Engine identification Img-6412
Cox Engine identification Img-6411
Cox Engine identification Img-6410
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Post  Jason_WI on Wed Oct 14, 2020 11:36 am

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.
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Post  Sleddin04 on Wed Oct 14, 2020 11:48 am

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! Smile
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Post  Jason_WI on Wed Oct 14, 2020 6:28 pm

I think I paid ~$100 for mine with a throttle ring peewee. Never know with eBay if you get two fighting over it.
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Post  batjac on Wed Oct 14, 2020 8:04 pm

What I want to know is, what size helicopter was that used on?!?

The Egg Beater Mark
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Post  davidll1984 on Wed Oct 14, 2020 8:48 pm

Cox international did search on that part tink is ad on part for pee wee .020 To run larger prop on particular model
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Post  dckrsn on Wed Oct 14, 2020 9:57 pm

batjac wrote:What I want to know is, what size helicopter was that used on?!?
The Egg Beater Mark
Mark, here it is. Cox Sky Copter
Cox Engine identification Cox-sk10
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