on the pilot if ingested. Because the entire engine rotated, it had to be precisely balanced, requiring precision machining of all parts. As a result, Monosoupapes were extremely expensive to build, the models costing $4,000 in 1916 (approx. $89,000 in 2017 dollars). However, they used less lubricating oil and weighed slightly less than the earlier two-valve engines. Variants Gnome Monosoupape 7 Type A (1916) seven-cylinder rotary engine, . Bore and stroke: . Gnome Monosoupape 9 Type B-2 (1916) nine-cylinder rotary engine, . Bore and stroke: . Gnome Monosoupape 11 Type C An 11 cylinder version Gnome Monosoupape 9 Type N (1917) nine-cylinder rotary engine, larger diameter crankcase than the B-2, 150 or 160 hp (112 or 119 kW), increasing capacity to . Bore and stroke: . Gnome Monosoupape 9 Type R 180 hp nine-cylinder rotary engine, development of 9N with same stroke. Applications List from Lumsden. Monosoupape 7 Type A Avro 504 Avro 511 Bristol-Coanda G.B.75 Sopwith Pup Monosoupape 9 Type B Avro 504 Airco DH.2 Airco DH.5 Blackburn Scout Blackburn Twin Blackburn Blackburn Triplane Bristol-Coanda T.B.8 Bristol Scout FBA Type B Flying boat Nieuport IV Royal Aircraft Factory B.E.8 Royal Aircraft Factory F.E.8 Short S.80 Short Type C Sopwith Sociable Sopwith Type 807 Folder Seaplane Sopwith Two-Seat Scout Sopwith Schneider Sopwith Pup Sopwith F.1 Camel Vickers Gunbus (FB.2, 3, 5, 6 and 7) Vickers F.B.12 Vickers F.B 19 Bullet helicopter (licence-built as M-2) Monosoupape 9 Type N Nieuport 28 Sopwith Camel Morane-Saulnier AI Orenco B Engines on display A nine-cylinder Monosoupape engine is on public display at the Royal Air Force Museum London. A nine-cylinder Monosoupape engine is on public display at the Aerospace Museum of California. A seven-cylinder Monosoupape engine is on display at Solent Sky. One Monosoupape built by Peter Hooker - England is on display at the Museo Nacional de Aeronáutica - Morón, Argentina. It is used during exhibitions to explain the rotary engines systems as it shows its operative internal parts. There is a restored B-2 Monosoupape on display at the New England Air Museum, Bradley Int'l Airport, Windsor Locks, CT, USA. TAVAS in Australia have two. http://www.tavas.com.au/rotary-engine.php Both for exhibition in flying aircraft. A restored Monosoupape 9 Type N is on display in the Reynolds-Alberta Museum. An original (unrestored) running nine-cylinder Monosoupape engine is on public display at the South Australian Aviation Museum in South Australia. A video of it running can be found