Quote:
Originally Posted by Taz
Gary- Fred Murrin has written an article on the Gnome 9N for OTF which will be published in the near future. He is also including photographs of one he overhauled, which I assume is the engine for his Camel. He goes into depth on how the two magnetos work along with the selector switch to provide rpm control. Told you that you needed to subscribe. We also have an original operators' sheet from and AEF unit on the 9N which will most likely go in the article.
cfgray- I know the U.III was a license built version of the double lambda, were the U.0 and U.I based on the later or earlier design?
Taz
Terry Phillips
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Hi, Taz,
Well, I'm stating this from memory (always a risk) but I believe the Uberursel UR.I was the license built 7-cyl. 50 h.p. Gnome Omega, the UR.II was the license built 9-cyl. 80 h.p. single bank Lambda, and the UR.III was the license built 18-cyl. 160 h.p. double bank Lambda-Lambda. The Monosoupape engine were designated as "Type A" (7-cyl. 80 h.p.), the "Type B" (9-cyl. 100 h.p.), etc., to the familiar "Type N" (a 1918 example of which was the engine which became famous as the "Wandering Gnome" at Rhinebeck Aerodrome early this year).
By the way, the dual mag selector switch rpm control used on the Type N was an ingenious set-up. The different combinations of settings would power different cylinders, so the engine could be run (for fairly short periods of time) at intervals of full-rpm.
Early production Monosoupape Type A Gnomes had a handwheel-operated geared arrangement to change the valve timing in flight, which permitted some throttling, but the set-up was heavy and didn't work too well, so it was dropped.
Best,
cfgray