| 词条 | RWD 18 | |||||||||||||||
| 释义 |
The RWD 18 was a four/five seat STOL (Short Take-Off and Landing) utility aircraft designed and built in Poland from 1936. DevelopmentDWL studied a small twin-engined STOL utility aircraft as a private venture due to the lack of official support, hoping to kindle new markets in multi-engined, utility and business aircraft. The RWD 18s safe handling characteristics and STOL capability were derived from the full span leading edge slats, which were operated by servo suction from a leading edge mounted venturi tube, and the fixed tri-cycle undercarriage. Construction was to have been mixed with wooden cantilever high wings having anhedral on the inner sections, fitted with full span powered leading edge slats and trailing edge flaps. The fuselage was a welded steel tube framework faired with wooden formers, covered with plywood and fabric, fitted out with a dual control cockpit and a bench seat in the cabin for two or three. At the rear of the fuselage a cantilever twin finned wooden tail unit was fitted to improve low-speed yaw control and stability. The spatted undercarriage legs were cantilevered from the engine nacelles and the fuselage under the nose with the main wheels fitted with 'Bendix' pneumatic brake units and the nosewheel steerable from the rudder bar. Any engine of around 150 hp could be fitted, but the prototype was fitted with 150 hp Cirrus Major four-cylinder inverted in-line engines fitted in nacelles at the junctions of the inner and outer wings. An RWD 9 was converted to the RWD 20, by fitting a tri-cycle undercarriage, to speed the development of the RWD 18s, with extensive trials carried out including rough and ploughed field landings, take-offs and taxiing. Flight trials were scheduled to be carried out in December 1939 but the incomplete prototype was destroyed in an air raid during the German invasion of 1939. Specifications (RWD 18 estimated){{aerospecs|ref=Cynk, Jerzy B.. “Polish Aircraft 1893 – 1939”. London, Putnam. 1971. {{ISBN|0-370-00085-4}} |met or eng?=met |crew= 1/2 |capacity=4/5 |length m= |length ft= |length in= |span m= |span ft= |span in= |swept m= |swept ft= |swept in= |rot number= |rot dia m= |rot dia ft= |rot dia in= |dia m= |dia ft= |dia in= |width m= |width ft= |width in= |height m= |height ft= |height in= |wing area sqm= |wing area sqft= |swept area sqm= |swept area sqft= |rot area sqm= |rot area sqft= |volume m3= |volume ft3= |aspect ratio= |wing profile= |empty weight kg= |empty weight lb= |gross weight kg= 1,500 |gross weight lb= 3,306 |lift kg= |lift lb= |eng1 number= |eng1 type= |eng1 kw= |eng1 hp= |eng1 kn= |eng1 lbf= |eng1 kn-ab= |eng1 lbf-ab= |eng2 number= |eng2 type= |eng2 kw= |eng2 hp= |eng2 kn= |eng2 lbf= |eng2 kn-ab= |eng2 lbf-ab= |max speed kmh= 270 |max speed mph= 168 |max speed kts= |max speed mach= |cruise speed kmh= 230 |cruise speed mph= 143 |stall speed kmh= |stall speed mph= |stall speed kts= |range km= dependent on load 1,000 to 2,000 |range miles= 621 – 1,242 |endurance h= |endurance min= |ceiling m= |ceiling ft= |g limits= |roll rate= |glide ratio= |climb rate ms= |climb rate ftmin= |sink rate ms= |sink rate ftmin= |Min sink speed km/h= |Min sink speed mph= |Min sink speed kts= |armament1= |armament2= |armament3= |armament4= |armament5= |armament6= }} See also{{aircontent|see also= |related=
|similar aircraft=
|lists= }} References1. ^1 2 Cynk, Jerzy B.. “Polish Aircraft 1893 – 1939”. London, Putnam. 1971. {{ISBN|0-370-00085-4}} {{refbegin}}
External links{{commons category|RWD}}
5 : RWD aircraft|Abandoned civil aircraft projects|Polish civil utility aircraft 1930–1939|High-wing aircraft|Twin-engined tractor aircraft |
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