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Which Thimble Drome Cox Engine Type?

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Which Thimble Drome Cox Engine Type?

Post  KaiHi on Tue Apr 30, 2013 2:14 am

Hi Cox Engine Forum Users,
Got this engine from a friend in order to restore and complete my Graupner Citabria from the early 80ties.
Need to find out what engine type it is for getting correct parts which need to be replaced (glow head, seal, reed valve etc.).
Thanks for your hints, KaiHi




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Re: Which Thimble Drome Cox Engine Type?

Post  coxaddicted on Tue Apr 30, 2013 4:08 am

Hi KaiHi,

for me, it looks like a pre 70's Babe Bee with muffler. I have a similar one in my p 40 warhawk. But I can be wrong.

It is funny, that you are restoring a Graupner Citabria too. I have also one, you maybe check my topic.

Here is a link:

https://www.coxengineforum.com/t4734-graupner-citabria-049-now-with-pictures

BTW: If you want a authentic restoration, you should use a black widow with a muffler. That's was Graupner recommended in the manuals. The Original Box also shows a Black widow with muffler, 45° rotated. The engine was not included in the kit.
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Re: Which Thimble Drome Cox Engine Type?

Post  RknRusty on Tue Apr 30, 2013 6:45 am

The "Thimble Drome" printed on the tank indicates it is in fact a Super Bee, a more powerful version of the Babe Bee. It did come from a Cox P-40 plastic RTF model. The difference is that its cylinder has dual bypass ports for increased fuel flow and more power than a Babe Bee. All Bees of that era share the same internals except the cylinders(which are interchangeable).

An inexpensive rebuild kit can be purchased at either
http://coxengines.ca/ or http://www.exmodelengines.com/

Welcome to CEF,
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Re: Which Thimble Drome Cox Engine Type?

Post  microflitedude on Tue Apr 30, 2013 7:44 am

I'm pretty sure the lettering on the tank was there on all BBs throughout the 60's.

If it is original to the P-40, (Super Bee) it will have "P-40" stamped in the cylinder port rather than a number and more ports as Rusty said.
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Re: Which Thimble Drome Cox Engine Type?

Post  KaiHi on Tue Apr 30, 2013 10:10 am

All,

Thanks for checking and for your much appreciate hints and resources. I’ve been able meanwhile to take the engine apart (thanks to the forum hints) since it was sitting for ages.



On the cylinder bottom section I could identify a stamped #2. Furthermore I’ve could only see one bypass port. So I assume it’s an old Babe Bee version. I’m looking forward to get the necessary replacement parts and get it running.

KaiHi

@Coxaddicted: Your Citabria luckily is in way better condition. I will keep on checking your topic.
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Re: Which Thimble Drome Cox Engine Type?

Post  SuperDave on Tue Apr 30, 2013 11:01 am

Kaihi:

Pay special attention to cleaning the venturi and needle which very often are gummed by old castor oil

Remember to properly position the fuel pickup tube either straghtit down or slightly to the left if you intend to fly control line.

Go to the Search file and reference "cleaning" for further tips.

SD


Last edited by SuperDave on Tue Apr 30, 2013 12:22 pm; edited 1 time in total
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Re: Which Thimble Drome Cox Engine Type?

Post  Kim on Tue Apr 30, 2013 12:16 pm

Hi KaiHi !

First of all, Welcome to the Forum !!!!!!

Just a thought as you work to get your engine running: Which ever site you choose, Matt or Bernie's, you might check out their bulk sales for some extra parts, and / or order some of the packages of parts, especially gaskets, reeds, and an extra glowhead or two.

Later !!!!!!!!!!!! Kim
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Re: Which Thimble Drome Cox Engine Type?

Post  Mudhen on Tue Apr 30, 2013 4:03 pm

If the cylinder is a #2, then the muffler was not intended for, and neither will it work on this engine. The #2's had spi.
If you want to use the muffler then you'll need a #6 to stay in the vintage. Or you can use a dual-slit cylinder from the eighties onward. In any case you want to make sure the cylinder you choose does not have free floating.
Mud
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