Identify this Engine?
 

Hi,

Can you identify this engine? It doesn't say anything on it at all except "OK".

Thanks!

RE: Identify this Engine?
 

It's a Herkimer OK made in various sizes thru the 40's, 50's, and 60's by the Herkimer tool company. .049's thru .35's and maybe more. Believe they even made a twin ignition engine back in the days of the dinosaur...........RJ

RE: Identify this Engine?
 

Thanks.

I also had someone say that this is an "OK Cub Twinstack".

Is that the same thing?

RE: Identify this Engine?
 

It looks like an OK Cub 29 or 35 made in the 50s. As I recall they used a ball and socket connection of the rod to the piston like their 049s. The engine was pretty much a failure because of this. The ball and socket just was not adequate for engines this size.

Denis

RE: Identify this Engine?
 

Yes, the smaller ones were called Cubs. I'm not so sure about the larger ones as I never owned one. The first RC plane I ever flew (1955) was powered by a Cub .074 diesel. Still out in the garage in the old engine box. [8D][8D] RJ

RE: Identify this Engine?
 

With your help, I've narrowed this engine down to two choices:

It's a Herkimer OK Cub, and either a .29 or a .35 made in the mid 50's.

Please tell me how I tell the difference between the 29 and the 35.

I measured the diameter of the piston. It is 0.7 inches. Is 0.35 the radius of the combustion chamber/piston?

I had someone tell me that the 29's had red trim and the 35's had gold.

Thanks!

Bob

RE: Identify this Engine?
 

The Anderson book says that the .29 (Red Trim) has 8 cylinder fins & the .35 (Gold Trim) has 9 cylinder fins . I would buy yours for parts . MAX H.