FlightGlobal.com
Home
Premium
Archive
Video
Images
Forum
Atlas
Blogs
Jobs
Shop
RSS
Email Newsletters
You are in:
Home
Aviation History
1920
1920 - 0732.PDF
JULY 8, 1920 A CONTRAST IN SUNBEAMS; On the left the 800 h.p. Sikh, and on the right the 100 h.p. Dyak 60 degs. There are four overhead valves to each cylinder, operated by two camshafts (overhead) to each row. It might be mentioned that a flywheel is fitted to these engines, and a further feature not usually found on aero engines is a governor which automatically cuts off the ignition when the engine speed reaches 2,500 r.p.m., or •when the oil pressure falls below 20'lbs/sq. in. The cylinders have a bore of 100 mm, and a stroke of 135 mm., and the power developed at the normal engine speed of 2,100 r.p.m. is 275 h.p. The weight, without water, fuel or oil, is 920 lbs. The Sunbeam " Manitou," 300 h.p., is suitable for all general purposes, such as aeroplanes, seaplanes, and large or small airships. It is of the Vee type, with its cylinders cast in blocks of three, and disposed on the crankcase in two rows of six each, placed at an angle of 60 degs. The valves, of which there are four per cylinder, are operated by two overhead camshafts. In this model the airscrew is indirectly driven, through a reduction gearing, the propeller shaft being mounted on an extension of the crankcase. The cylinder dimensions are no by 135 mm. and the normal power of the engine is 300 h.p. at 2,000 r.p.m. The weight in running order is 904 lbs. The Sunbeam " Cossack 3," 350 h.p., has been especially designed for airship work, and was used in the airships R. 37, R. 38 and R. 39. It has twelve cylinders, no by 160 mm., set in two rows of six each at an angle of 60 degs. The cylinders are cast in blocks of three, and each cylinder has two inlet and two exhaust valves, operated by overhead camshafts, one to each set of valves. The camshafts are driven by means of a train of gears from the crankshaft. A special arrangement is made for the exhaust to be water cooled, and this engine, like the " Maori," is fitted with a governor. The engine develops 350 h.p. at 2,000 r.p.m. and weighs 1,200 lbs. without water. The Sunbeam " Matabele," 400 h.p., is a general purpose engine, suitable for either aeroplane, seaplane, or airship. The cylinders, 122 by 160 mm., are cast in blocks of three, the angle between opposite banks being 60 degs. As in several of the other models there are four valves per cylinder, operated by overhead camshafts. The rated power of 420 h.p. is delivered at a speed of 2,000 r.pjn., when the propeller speed is 1,225 r.p.m. The weight of the engine in running order, but without fuel and oil, is 1,091 lbs. The petrol consumption is -54 pint per b.h.p. per hour. Both compressed air starters and hand starters are fitted to this engine. Next in size comes the 400-450 h.p. 6-cyl. " Sikh," a vertical engine with separate cylinders. This engine is A TRIO OF SUNBEAMS Above, the 300 h.p. Manitou. On left, the 400 b.p. Matabele, and on the right, the 800 h.p. Sikh 732
Sign up to
Flight Digital Magazine
Flight Print Magazine
Airline Business Magazine
E-newsletters
RSS
Events
