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Aircraft utilizing three or more spars are considered multi-spar aircraft. Using multiple spars allows for an equivalent overall strength of wing, but with multiple, smaller, spars, which in turn allow for a thinner wing or tail structure (at a cost of increased complexity and difficulty of packaging additional equipment such as fuel tanks ...
Wing ribs of a de Havilland DH.60 Moth. In an aircraft, ribs are forming elements of the airframe structure of a wing, especially in traditional construction.. By analogy with the anatomical definition of "rib", the ribs attach to the main spar, and by being repeated at frequent intervals, form a skeletal shape for the wing.
On many aircraft, the inner volume of the wingbox has also been used to store fuel, which is commonly referred to as being a wet wing design. [ 1 ] In recent years, there has been an increasing use of composite materials within the wingbox; this trend has largely been pursued to achieve lower weights over designs only using conventional materials.
The wing structure comprised steel spars with duralumin ribs and covering, and was braced using steel struts. The aircraft's tail assembly was also composed of duralumin. It was powered by three Bristol Jupiter radial engines, rated at 420 horsepower (310 kW) each, with one mounted in the nose and the other two on the leading edge of the wing ...
Varney Air Lines M-2 after accident exposing mail compartment. Lloyd Stearman and Mac Short, (Stearman's V.P. engineering), designed the Speedmail to the requirements of Varney Air Lines, which needed a new mail carrier with greater capacity to fly the Air Mail contracts they acquired from the U.S. Postal service while still being able to land on short, unimproved airstrips.
The spars are made of spruce wood with plywood wooden wing ribs. The base engine is a Lycoming O-360 180 hp (134 kW) engine, but alternative examples have been built using the Lycoming IO-540 , Ranger, Ford V-8 and V-6, Continental, Jacobs, and even Pratt & Whitney R-985 engines.
Data from The Stahlwerk-Mark R.V/23 Commercial Monoplane General characteristics Crew: One Capacity: Three passengers Length: 7.9 m (25 ft 11 in) Wingspan: 14.25 m (46 ft 9 in) Height: 3.35 m (11 ft 0 in) Wing area: 27 m 2 (290 sq ft) Aspect ratio: 7.52 Empty weight: 800 kg (1,764 lb) Gross weight: 1,280 kg (2,822 lb) Powerplant: 1 × Mercedes D.I 6-cylinder water-cooled inline, 75 kW (100 hp ...
F-21 with 42 gal total fuel capacity and 1,750 TOGW. New wing spars and aluminium under-fuselage skinning. 15 built 1985-1990. A further development was the F-22: F-22A Tricycle gear F-22C STOL 180 Tricycle gear 180hp - 1 built