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Old Nov 20, 2012, 03:59 AM
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Antonior's Avatar
Viterbo - Italy
Joined Jun 2006
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Help!
Engine identification

Please help me to identify this engine



Thanks
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Old Nov 20, 2012, 05:30 AM
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earlwb's Avatar
USA, TX, Grapevine
Joined Dec 2008
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It looks like a Cox Queen Bee .075 radio control engine to me.
It is sort of a big bore Baby Bee with a rear mounted RC throttle carburetor on it.
It has a reed valve in the back, so it can run forward or in reverse as needed.
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Old Nov 20, 2012, 05:33 AM
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Antonior's Avatar
Viterbo - Italy
Joined Jun 2006
66 Posts
FOUND!! It is a Cox Queen Bee 0.74. Now I need the worksheet. Can anybody provide it?

Thanks again from Italy
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Old Nov 20, 2012, 12:40 PM
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coriolan's Avatar
Canada, BC, Vancouver
Joined Sep 2006
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Here is a pdf of the QB manual:
http://coxengines.ca/files/074%20Queen%20Bee.pdf
You can also get some spare parts here:
http://coxengines.ca/cox-074/
Lot of Cox infos here:
http://www.mh-aerotools.de/airfoils/cox_frameset.htm
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Old Nov 20, 2012, 01:29 PM
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Antonior's Avatar
Viterbo - Italy
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Quote:
Originally Posted by coriolan View Post
Here is a pdf of the QB manual:
http://coxengines.ca/files/074%20Queen%20Bee.pdf
You can also get some spare parts here:
http://coxengines.ca/cox-074/
Lot of Cox infos here:
http://www.mh-aerotools.de/airfoils/cox_frameset.htm
Thanks, Coriolan. You are very kind
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Old Nov 20, 2012, 01:51 PM
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surfer_kris's Avatar
Sweden
Joined Jan 2008
901 Posts
Here is a little video of one of mine on the bench; Queen Bee
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Old Nov 20, 2012, 02:37 PM
Complete RC Idiot Savant
The Netherlands
Joined Nov 2009
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Runs beautiful! Too bad I cannot read the RPM at idle.... Really curious how low it will go.

Brgds, Bert
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Old Nov 20, 2012, 05:35 PM
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USA, TX, Grapevine
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Well with the little 1/2 A size engines, they can idle at 6,000 or so RPMs and the plane will still land just fine. The air density doesn't change as the plane gets smaller, so it has to overcome more drag in relation to a larger size plane and engine.

But the Queen Bee engines aren't really bad, they run quite well. But unfortunately they weren't all that popular though.
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Old Nov 20, 2012, 11:44 PM
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Sweden
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Quote:
Originally Posted by Brutus1967 View Post
Runs beautiful! Too bad I cannot read the RPM at idle.... Really curious how low it will go.
In the video it goes down to about 5000rpm, but it runs very rich. The fix for that is to add an airbleed hole and it will run better.
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Old Nov 21, 2012, 01:40 AM
Complete RC Idiot Savant
The Netherlands
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It's a shame, Graupner, who carried the Cox engines in Europe, did not have the full range. As far as I know the RC engines were never in their line-up, or I would have had one for sure....

Brgds, Bert
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Old Nov 24, 2012, 10:34 AM
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DarZeelon's Avatar
Israel, Ramat HaSharon
Joined Nov 2003
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Antonior,


It is not a .74; it is a .074 (cubic inches); roughly 1.2cc in metric displacement.
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Old Nov 24, 2012, 11:27 AM
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Antonior's Avatar
Viterbo - Italy
Joined Jun 2006
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Quote:
Originally Posted by DarZeelon View Post
Antonior,


It is not a .74; it is a .074 (cubic inches); roughly 1.2cc in metric displacement.
Thanks for the precise statement
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