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Oct 06, 2017, 10:09 PM
Now I have to land that thing?
PGregory's Avatar

Paperwork for 70'ish Fox 40 CL Engine

I was gifted a nice Fox 40 plain-bearing CL engine by a generous club member.
It came in the box, nice, but no paperwork.
Does anyone have this to scan and send me ? Much appreciated, if so.
I believe you would want to go up on the prop from a .35, to a 11x5 or 11x6.
Almost no info on the internet, at least that I have found.
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Oct 07, 2017, 09:50 AM
Old Timer
The Kiwi's Avatar
The one that I have is also unused, and I never had the instructions, either. Duke had the original design several years before modifying it and selling a few of them. Initially, it was intended to be a racing engine, for CL Rat Racing. George Aldrich designed it, he told me.

George designed it with twin ball bearings on the crankshaft. It is a Schneurle ported type, with an unusual mounting pattern. A few European stunt fliers used the type, but generally, the engine wasn't well accepted here in the US. Similar to most engines ported like that, it will run best in a steady, higher-rpm state, with a lower-pitched prop.

An 11-5 is more suitable to a slower-running plain loop-scavenged engine in the 35 size. You'll need an 11-4, instead.

Last edited by The Kiwi; Oct 07, 2017 at 05:53 PM.
Oct 11, 2017, 11:53 AM
Registered User
flyelectcl's Avatar
This may be of help
Oct 11, 2017, 11:58 AM
Registered User
I believe this version is a collaboration between Duke Fox and George Aldrich. The liner uses a laminar flow transfer port.
Last edited by Fox35; Oct 12, 2017 at 07:07 AM.
Oct 11, 2017, 12:24 PM
Old Timer
The Kiwi's Avatar
Originally Posted by flyelectcl
That ("Rocket") 40 predated the OP version by 12-13 years, and was closely related to the the several Combat Special 35s of 1955, 1957, and 1960., as well as to the several "Rocket 35" sport engines.


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