著者
安東 茂典
出版者
一般社団法人 日本航空宇宙学会
雑誌
日本航空宇宙学会誌 (ISSN:00214663)
巻号頁・発行日
vol.35, no.397, pp.91-101, 1987-02-05 (Released:2010-12-16)
参考文献数
12

A concept of PAR (Power Augmented Ram Wing) is presented. It will be useful in future for over-water transport vehicles to carry passengers, cargos, and/or cars. It is much faster than ships, while it requires no run-way in contrast to airplanes. The PAR concept makes the fuselage-shape “aero-configured” rather than “hydro-configured”, and so decreases the parasite-drag singificantly. An empirical formula is found for the effective aspect ratio which is applicable to verious kinds of Ground Effect Wings. The present PAR concept has a variable geometry wing, in front of which tiltable turboprop engines are installed. Untill the take-off speed is exceeded, the wing is swept-forward with extended full span flaps (the outer ones are differential flaps). In cruising condition the wing becomes unswept. If the sea-state is bad the vehicle can fly off-ground effect with unswept wing. Thus cancelling operations is much more reduced than hovercrafts or hydrofoil-boats. Special devices are proposed for the tip-floats, which improve aero-dynamic efficiency and which alleviate load due to wave-impacts.
著者
安東 茂典 梶田 弘
出版者
一般社団法人 日本航空宇宙学会
雑誌
日本航空宇宙学会誌 (ISSN:00214663)
巻号頁・発行日
vol.40, no.456, pp.14-22, 1992

Static longitudinal stability of tailless airplane is evaluated theoretically with two methods. One is quasi (or modified)-strip method and the other is a lifting surface theory—DLM. Computation is made on the basis of available data of Northrop XB-35. The both methods agree each other only qualitatively; of course results of DLM should be much more reliable. Allowable limit of longitudinal CG position may be almost comparable with that of conventional airplanes. The airplane efficiency factor, e concerning with induced drag, is computed which is also satisfactory at least for cruising configuration.