Engine identification

Antonior · Nov 20, 2012, 03:59 AM

Please help me to identify this engine

Thanks

earlwb · Nov 20, 2012, 05:30 AM

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.

Antonior · Nov 20, 2012, 05:33 AM

FOUND!! It is a Cox Queen Bee 0.74. Now I need the worksheet. Can anybody provide it?

Thanks again from Italy

coriolan · Nov 20, 2012, 12:40 PM

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

Antonior · Nov 20, 2012, 01:29 PM

Quote:

Originally Posted by coriolan

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

surfer_kris · 02:02 PM

Here is a little video of one of mine on the bench; Queen Bee

Brutus1967 · Nov 20, 2012, 02:37 PM

Runs beautiful! Too bad I cannot read the RPM at idle.... Really curious how low it will go.

Brgds, Bert

earlwb · Nov 20, 2012, 05:35 PM

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.

surfer_kris · Nov 20, 2012, 11:44 PM

Quote:

Originally Posted by Brutus1967

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.

Brutus1967 · Nov 21, 2012, 01:40 AM

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

DarZeelon · Nov 24, 2012, 10:34 AM

Antonior,

It is not a .74; it is a .074 (cubic inches); roughly 1.2cc in metric displacement.

Antonior · Nov 24, 2012, 11:27 AM

Quote:

Originally Posted by DarZeelon

Antonior,

It is not a .74; it is a .074 (cubic inches); roughly 1.2cc in metric displacement.

Thanks for the precise statement

Nov 20, 2012, 03:59 AM	#1
Antonior Registered User Viterbo - Italy Joined Jun 2006 61 Posts	Engine identification Please help me to identify this engine Thanks

Nov 20, 2012, 05:30 AM	#2
earlwb Registered User USA, TX, Grapevine Joined Dec 2008 10,262 Posts	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.
	Latest blog entry: My Low Wing plane

Nov 20, 2012, 01:51 PM	#6
surfer_kris Registered User Sweden Joined Jan 2008 743 Posts	Here is a little video of one of mine on the bench; Queen Bee
	Last edited by surfer_kris; Nov 20, 2012 at 02:02 PM.

Nov 20, 2012, 05:35 PM	#8
earlwb Registered User USA, TX, Grapevine Joined Dec 2008 10,262 Posts	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.
	Latest blog entry: My Low Wing plane

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Nov 20, 2012, 05:33 AM	#3
Antonior Registered User Viterbo - Italy Joined Jun 2006 61 Posts	FOUND!! It is a Cox Queen Bee 0.74. Now I need the worksheet. Can anybody provide it? Thanks again from Italy

Nov 20, 2012, 12:40 PM	#4
coriolan "Unnecessary Necessity" Canada, BC, Vancouver Joined Sep 2006 4,855 Posts	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

Nov 20, 2012, 02:37 PM	#7
Brutus1967 Complete RC Idiot Savant The Netherlands Joined Nov 2009 1,450 Posts	Runs beautiful! Too bad I cannot read the RPM at idle.... Really curious how low it will go. Brgds, Bert

Nov 21, 2012, 01:40 AM	#10
Brutus1967 Complete RC Idiot Savant The Netherlands Joined Nov 2009 1,450 Posts	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

Nov 24, 2012, 10:34 AM	#11
DarZeelon Registered User Israel, Mishmar HaShiva Joined Nov 2003 741 Posts	Antonior, It is not a .74; it is a .074 (cubic inches); roughly 1.2cc in metric displacement.