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Aircraft Topics related to WWI aircraft, aircraft engines and armament

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Old 21 March 2014, 03:38 AM   #1
Geepig
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Mystery air-cooled engine cylinder

Over on the HMVF forum, someone has posted some images of an air-cooled cylinder barrel that looks to be from some kind of Gnome-type rotary engine.

It currently resides in New Zealand, and was formerly used as a bell by the New Zealand Royal Electrical and Mechanical Engineers. While it seems to have the features of a monosoupape, it has a bore of 138mm (5.2 inches) and twin spark plugs mounted at 45 degrees to the engine centreline. The method of extracting the valve mechanism appears to be different as well, with a ring of spigots for the wrench to fit instead of the slots commonly seen on Gnome engines.

We cannot find any images on the web or any data that matches, but would love to solve this mystery!

Help ID Cylinder Head , WW1 Radial Aircraft Engine ???

Trevor

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Old 21 March 2014, 09:43 PM   #2
RAF56_Ball
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They seemed on the right track with a monosupape head, but I agree, not the usual. The sparkplug holes are wrong for that.
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Old 24 March 2014, 06:25 AM   #3
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Thanks - and yes, those spark plug holes are just so different to anything else we have been able to find.

Geepig
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Old 16 April 2014, 03:14 AM   #4
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I think I may be on the path to solving this, after following a chance link on another forum. The Goebel Goe III has the same raised dimples around the valve unit on top of the cylinder, a similar rocker mount - and 2 x 45 degree spark plug holes, each in the right place!

See: Goebel Goe III - Deutscher Umlaufmotor von 1918 mit 9 Zylindern

trevor
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Old 17 April 2014, 09:29 AM   #5
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Way to hang in there, trevor, I think you nailed it.
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Honor: SEE-ing the right things, always guarding you.

in Honor of Albert Ball. A valiant pilot, but a man of God first and last.
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Old 17 April 2014, 02:15 PM   #6
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Schwade - Stahlherz
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