Synonymer & Information om | Engelska ordet PROPFAN

Exempel på hur man kan använda PROPFAN i en mening

• For several years, McDonnell Douglas proposed powering the MD-90 with two unducted fan (UDF) or propfan engines, designated the MD-94X.
• NASA Dryden Lockheed C-140 Jetstar 1964 – Electronic variable stability, propfan engine (1981) and laminar flow wing testbed (1985).
• A propfan, also called an open rotor engine, open fan engine or unducted fan (as opposed to a ducted fan), is a type of aircraft engine related in concept to both the turboprop and turbofan, but distinct from both.
• However, Boeing became increasingly interested in the latest propfan engine research that would yield large double-digit fuel savings, in particular with the gearless unducted fan (UDF) concept from the aviation division of General Electric.
• The propfan engines deliver slipstream to the supercritical wings that feature double-slotted trailing edges to provide high lift coefficients at low speeds.
• In April 1990, while announcing the interim aircraft's service entry date of 1993, Tupolev's chief designer said that the ultrahigh bypass engine to be used would be a Lotarev (now renamed to the Progress design bureau) propfan resembling the General Electric GE36 UDF, and not the propfan it had been working on.
• In April 1987, Boeing formally selected the GE36 as the powerplant for the Boeing 7J7, deeming the IAE SuperFan ultra-high bypass (UHB) geared turbofan as less fuel efficient and the Pratt & Whitney/Allison 578-DX geared propfan as insufficiently powered.
• ;D-227: an unducted propfan that could be gearless (direct-drive) or geared, with an output rating of.
• Each propfan was to have a coaxial contra-rotating tractor propeller, and the An-180 was also designed with a retractable landing gear with twin nosewheels, and tandem pairs of mainwheels.

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