Re: OK Cub .049

rsv1cox Tue Oct 29, 2024 6:11 pm

Now I see what you mean. Smile

It's me. Many times I don't make myself clear. Typing and me just do not get along.....

Back to Robert's control............... Smile

Ken Cook Wed Oct 30, 2024 3:42 am

Was the case drilled to accept the spraybar of the OS unit? I would imagine that spraybar has a bit more diameter over a stock unit. The .039 is one of those engines caught in between prop sizes. A APC 4.6x3 might be a good option. I certainly would keep the load light.

rdw777 Wed Oct 30, 2024 9:06 am

I compared the needle assembly to the one I pressed out of the first engine and found the OS unit to be slightly smaller so it looks to be a near drop in fit…. The Cub spray bar
is .125” and the OS is .120”….Photo below …

This website….

https://www.adriansmodelaeroengines.com/catalog/main.php?cat_id=456

… has some interesting insight on the .039 with some testing and prop size information….
Interesting at least to me anyway, His results showed a peak HP of about .030 (about 22 watts)…. Compared to a PeeWee’s 26 watts….Would be an ideal engine for some of the sport free flight designs from around the same period as the engine IMO….

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