Science

muriel_volestrangler

(103,401 posts)

8. The Wikipedia article "Propfan" suggests propfan/open rotor engines typically have swept blades

Tue Apr 1, 2025, 04:12 PM

Tuesday

and often contra-rotating fans. The swept blades are credited with the better efficiency at speeds higher than a turboprop can achieve:
https://en.wikipedia.org/wiki/Propfan

The FT illustration looks more like one rotating fan in front of a static set of blades; or maybe that's meant to show a fast fan in front of a slow one.

The thrust from the exhaust is still notable for a turbofan, and I guess a propfan.

I believe the Soviet Bear turboprop, with contra-rotating propellors, is infamously noisy; I wonder if these open rotor engines would suffer from that too.

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Hugin

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Airbus to test radical engine design for successor to A320 [View all] usonian Mar 25 OP

Pretty cool tech. I think. Smaller jet engines provide the thrust and the fan blades provide the lift. OAITW r.2.0 Mar 25 #1

Fans are efficient, and efficiency is the name of the game. usonian Mar 26 #2

I don't see the advantage over a turbo-prop... Hugin Mar 26 #3

Fans on jet engines move air more efficiently than combustion alone. usonian Mar 26 #5

Turbo-props vs turbo-fans vs turbo-jets... Hugin Mar 26 #7

The Wikipedia article "Propfan" suggests propfan/open rotor engines typically have swept blades muriel_volestrangler Tuesday #8

The OP article says... Hugin Tuesday #9

Kim-1 and MC6800 computers LastDemocratInSC Mar 26 #4

I still have a couple. An entire COSMAC evaluation kit. usonian Mar 26 #6