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Old 09-05-2007, 03:46 AM
autogyro autogyro is offline
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Default who know paratrike autogyro?

i got a image of a gyros, it is with a ducted fan at the end. i google it but did not get any result. who know this gyros? can give more information about it?
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Old 09-05-2007, 04:52 AM
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I would like to see someone get in it and see the nose hit the ground.
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Old 09-05-2007, 08:35 AM
digbar digbar is offline
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Default Efficient fan design

Hey, Brent:

Maybe it's made for people lighter than us. The engine is well aft of the main gear, and the prop duct adds a lot of mass behind that. Keeps the rotor away, and makes the prop a good deal more efficient.

Just make darn sure you keep the stick aft when landing!
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Old 09-05-2007, 09:52 AM
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I bet the VCG is aft of the RTL in-flight on that one if the engine is so far to the rear. Not G-load stable? Another beautiful killer?
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Old 09-05-2007, 09:59 AM
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Nice looking gyro.

There were other ducted fan gyro designs too but too bad non made it to the final take off or flight.
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Old 09-05-2007, 10:25 AM
C. Beaty C. Beaty is offline
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The Canadian Avian with ducted fan apparently did fly.

http://www.aviation.technomuses.ca/c...Designer=Avian
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Old 09-05-2007, 12:59 PM
Ronnie L Ronnie L is offline
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This was built in the UK many years ago.
The undercarriage looks further back than when saw it.
I believe it has two rotax two stroke engines.

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Old 09-05-2007, 01:31 PM
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What are the advantages of the ducted fan? Can you get more thrust with same HP and smaller prop/fan?
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Old 09-05-2007, 10:05 PM
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Kugel, yes, with the right duct you can get more thrust with the same horsepower, or the same thrust with less horsepower, etc. You can also add stator blades ("flow straighteners") fixed to the interior of the duct to take the swirl out of the flow that is imparted by the prop, for an additional increase in thrust efficiency. All of the extra surface area added by the duct and stator adds drag, though, so the gains aren't as dramatic as you'd first think. There's weight, too.

Dave
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Old 09-06-2007, 04:31 PM
Kugel Kugel is offline
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Quote:
Originally Posted by murmur View Post
Kugel, yes, with the right duct you can get more thrust with the same horsepower, or the same thrust with less horsepower, etc. You can also add stator blades ("flow straighteners") fixed to the interior of the duct to take the swirl out of the flow that is imparted by the prop, for an additional increase in thrust efficiency. All of the extra surface area added by the duct and stator adds drag, though, so the gains aren't as dramatic as you'd first think. There's weight, too.

Dave
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Old 09-08-2007, 12:10 PM
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Chuck and all,

the Avian was type-certified but never produced. In the 90s a group was trying to get funding to build it as the "Pegasus." They're registered in Nevada but I believe that they have two of the three prototypes in nonflyable storage in California.

It is Lycoming powered and capable of jump takeoff. While it was developed in Canada and did fly, I don't think any production engineering was ever done on it.

http://www.pegasusrotorcraft.com/

cheers

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