Re: SikorskyX2: Xtremely Hi-Speed Copter

manofsan@xxxxxxxxx wrote: 
Here's an interesting announcement:

http://www.sikorsky.com/details/0,3036,CLI1_DIV69_ETI2088,00.html

Apparently Sikorsky is planning a new extremely high-speed helicopter,
with coaxial rotors and pusher prop. Their target cruise speed cieling
is 250 knots, which is much higher than existing helicopters.

But how would they be able to overcome the large drag associated with
coaxial designs? What trick would they be using to avoid this?

Any comments on this, or on the other technologies mentioned in the
article?


I would guess that as forward speed increases the rotor speed will decrease.
Having coaxial rotors means that the lift generated will be symmetrical.

--
Dirk

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