propfan


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propfan

[′präp‚fan]
(aerospace engineering)
An advanced turboprop with very thin, highly swept blades to reduce both compressibility losses and propeller noise during high-speed cruise.

propfan

propfan
An advanced propeller for use at high Mach numbers. It has six to twelve blades. The sweeping of the blade delays the critical Mach number (Mcrit) and reduces the noise from the tips of the blades. The sweep also alters the phase of the noise generated by each radial section along the blade, causing a certain amount of interference. This results in noise reduction. A propfan can be used either as a pusher or a tractor.
References in periodicals archive ?
EasyJet plane solution and it is no secret that their plane proposal shares many of the characteristics of the US propfan efforts in the late eighties and early nineties.
This lower tip speed may permit the application of lightweight composite material and a spar/shell construction similar to the swept, counterrotating, variable-pitch blades used on the open rotor propfan engine.
Thus was invented the propfan, an "ultra-high" bypass engine that is a throwback in two ways.
Green sky thinking - carbon credits and the propfan comeback?
Designed for the new Propfan jet engine, this seal has a stainless steel housing
There is an argument in favour of the Russian Air Force having both the IRTA and the much larger Tu-330 (or the Ukraine's propfan An-70), but for the time being that service may have to settle for one or the other.
In combination with ducted propfans and a swept wing, this was thought to provide potential for speeds up to 740 km/hr.
The sole direct competitor for the A400M is the 145-tonne Antonov An-70, which is powered by 10,350-kW Progress D-27 engines turning 14-blade contra-rotating propfans.
Older physically thanthe A400M, having first flown in 1994, but arguably more advanced technologically, having propfans rather than turboprops, the Antonov An-70 is a long-running on-again, off-again saga that might (if launched earlier) have become one of the aerospace success stories of the Soviet Union.
The An-70 is powered by four 10,300-kW Ivchenko-Progress D-27 engines (25% more powerful than the TP400), turning 14-blade (eight at front, six at rear) contra-rotating SV-27 propfans.
The A-42 could be a development of the 86-tonne A-40 of 1986, since the company website refers to a 96-tonne Be-42PE with Progress D-27A propfans replacing the A-40's Soloviev D-30KPV turbofans.