"1/2 A" & "1/8 A" airplanes These are the small ones...more popular now than ever.

this ones for AJC

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Old 12-07-2002, 12:56 AM
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fastlash
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Default this ones for AJC

Saw a picture of your sub piston intake design on the site that dickybird turned us on to, I was curious as to how well it works and what type of port you machined into the sleeve??And did you port the piston or trim the piston skirt?? loved the thimble
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Old 12-07-2002, 02:13 AM
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Default HOLY SUB PISTON INDUCTION BATMAN...

This is the kind of stuff us speed junkies LOVE...

What site are you referring to?
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Old 12-07-2002, 03:31 AM
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Default Re: this ones for AJC

Originally posted by fastlash
Saw a picture of your sub piston intake design on the site that dickybird turned us on to, I was curious as to how well it works and what type of port you machined into the sleeve??And did you port the piston or trim the piston skirt?? loved the thimble
I think you are referring to the Piston Ported Cox 049 I have made up quite a few. The engine uses a Cox #2 (babe bee) single bypass thickwall cylinder. The intake is on the side opposite the bypass, and the intake is silver brazed onto the cylinder after drilling the intake hole in the proper location. The cylinder must be relapped after silver brazing as the leaded steel will "shrink" and slightly deform. An aluminum lap charged with diamond lapping paste makes quick work of refitting the piston. The crankcase is a stock TD one, with a custom aluminum front to replace the plastic one. I also fit an aluminum plug into the crank as to "stuff" the case volume. The thimble is the icing on the cake, as it is now a real "Thimble Drome" engine! HA!

The engine, as most piston ported designs, is not meant for speed, but will run happily at an RPM similar to a reed valve cox engine. It will turn a larger prop like a 7 or 8 inch like a Texaco.

It is mainly done for fun and for the originality. I cannot take credit however for the design, that goes to a fellow Canadian that lives in Quebec, Canada, Mr. E D Cox! (no relation to the Cox engines!) It was a published article in "Strictly I. C." a magazine devoted to miniature internal combustion engines, no longer in print.

Hope that helps!

Andrew J. Coholic
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Old 12-07-2002, 08:32 AM
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Default didn't know you were famous

That is as brilliant as it is beautiful.
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Old 12-07-2002, 01:34 PM
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Default Re: didn't know you were famous

Originally posted by prole
That is as brilliant as it is beautiful.
Yup, our friend Andrew is quite a creative craftsman. Check out another of his projects here: http://www.rcuniverse.com/showthread...3&pagenumber=3
about a quarter of the way down the page. Is that cool or what! )
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Old 12-07-2002, 03:52 PM
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Default this ones for AJC

He He He

You guys... its just a bit of foolin' around! It is nice to have someone to show my creations too.

Andrew
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