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"Cherry Bomb" .051 engine

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Post  rsv1cox Sat May 30, 2015 1:59 pm

When I found this McCoy 35 it had a strange glow plug, I thought someone just had it installed in a model that had poor access so they added an extension.
A McCoy surprise McCoy%20surprise%20002_zpsqvo2y618

Wrong.....When I removed it I found that the heater coil had been removed.

A McCoy surprise McCoy%20surprise%20004_zpsx4iotiof

Looking closer I noticed there is a restrained ball bearing embedded in the end. Some sort of compression tester maybe but when I added a propeller and turned it over the ball did not move although there is compression in the engine.

A McCoy surprise McCoy%20surprise%20013_zpsc1wacyxb

Any ideas as to what this might be or the motivation of the perpetrator?

The McCoy herd grows.....

A McCoy surprise McCoy%20surprise%20017_zpszjjlrz8w

Thanks - Bob
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Post  Cribbs74 Sat May 30, 2015 2:10 pm

My guess would be Co2 powered free flight.
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Post  roddie Sat May 30, 2015 2:52 pm

I'm thinking it was an attempt at a small homemade air compressor. Maybe for air-brushing?
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Post  TDbandit Sat May 30, 2015 3:36 pm

Possible pneumatic conversion (someone tried to run it on air). if you haven't pulled the head I would pull it to make sure a peg hasn't been added to the piston. Pegs used to push the check ball off its seat at top dead center in air powered or Co2 as Ron stated. (bandit)
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Post  rsv1cox Sat May 30, 2015 6:28 pm

Thanks, Maybe air compressor or co2.

I will disassemble tomorrow and look for that peg, also see if I can loosen up that ball bearing. It seems to be such a simple mechanism though to perform the more complicated task of co2 operation. Seems like a more robust pressure tank would be involved to operate anything bigger than an .049??

Head scratcher.....
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Post  TDbandit Sat May 30, 2015 6:48 pm

It is, all it does is forms a valve when pressure is added when the peg hits this ball it lifts it off its seat allowing pressurized air to flow in, pushing the piston back down closing the valve in the process and the air escapes out the exhaust and the process repeats, but yup it would probably take a paint ball sized Co2 tank to run it for any length of time. lubrication is an issue though. I would check this engine over thoroughly paying spechle attention to the crank bushing and rod. that's if this engine was used for this process.it sure looks like it though and hopefully there is no pin not sure how you would get it off with out killing the piston.
(Bandit)
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Post  rsv1cox Sun May 31, 2015 8:58 am

Disassembled it this morning, came apart easy indicating some sort of previous take-down.  Everything looks normal (no peg) but the pistons baffle is on the exhaust port side where my other .35's was on the opposite side.

A McCoy surprise McCoy%2035%20dis%20003_zpssz5ftwkw

Guess I will just clean it up, sandblast the case, re-blue the cylinder, paint the head, install new gaskets and a normal glow plug and see how she runs.  

A McCoy surprise McCoy%2035%20dis%20006_zpsquarb26q

I still need to look at that modified glow plug and see if the ball will move.  So, which side is correct for that baffle?
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Post  Ken Cook Sun May 31, 2015 9:23 am

Baffles always go opposite of the exhaust. The cylinder of a Mccoy can only go on one direction. and have the case holes line up.  The piston and rod assembly can be installed 180 deg as you have. I just wonder how many times someone moved the piston up and down in the cylinder like that. This can really do damage as the piston was lined up 180 to it's current situation. These engines are not very high tolerance engines therefore the cylinder in a exaggerated sense can be shaped like an egg. Putting it in the other way and forcing it over now takes the high spot off of the piston and or cylinder. Both which are quite soft. Putting it back together and running it will certainly let you know. Ken
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Post  TDbandit Sun May 31, 2015 9:24 am

Cool just make sure when you reassemble that you put the baffle back on the intake side. It has to be on the intake side to run. (Bandit)

(Edit)
Looks like Ken beat me sorries
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Post  rsv1cox Sun May 31, 2015 9:55 am

Thanks guys.  I wonder if the PO just got it wrong or intentionally did it because of some relationship to the modfied glow plug?

Edit add... Just bought this - only one I have ever seen with a tank that hasn't been removed.

http://www.ebay.com/itm/361277993952?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
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