Hi  all.
 Is  there  anyone  in  the  group  with  a  rotary
 powered  heli,  or  have  an  ongoing  helicopter
 project  using  rotaries ?

 Best regards.
 Ben    Sison

 Lots. Unfortunately most of them probably failed because
 the designer underestimated the rotary cooling requirements.

 A large fan mounted on the front of the e-shaft would be
 called for and the engine derated for that power loss.

 This was done well by Robinson.

 The cooling air should be taken in at the very front and exited
 at the rear to take every possible advantage of the waste heat.

 Paul Lamar

Hi,

What do you think about this NEO, two rotor wankel (Mazda?)?

http://www.youngcopter.com/index.html

Regards,
Heikki


"NOTAR is the name of a helicopter anti-torque system which replaces
the use
of a tail rotor. Developed by McDonnell Douglas Helicopter Systems
(through
their acquisition of Hughes Helicopters), the name is an acronym derived
from the phrase no tail rotor. The system uses a fan inside the
tailboom to
build a high volume of low-pressure air, which exits through two slots
and
creates a boundary layer flow of air along the tailboom utilizing the
Coandă
effect. The boundary layer changes the direction of airflow around the
tailboom, creating thrust opposite the motion imparted to the fuselage by
the torque effect of the main rotor. Directional yaw control is gained
through a vented, rotating drum at the end of the tailboom, called the
direct jet thruster. Advocates of NOTAR believe the system offers quieter
and safer operation."

The patents must have expired on the Notar.
I see no cooling system so far for the Mazda 2 rotor so I can't
comment on that.

He needs a p-port Mazda engine. For better altitude performance
a turbo charger. Lots of potential here if the he gets the cooling system
to work

Björn Jung Looks familiar I may have met him or his father some
place.

Paul Lamnar

 He could have a sealed engine compartment pulling the air thru a
radiator on top somewhere and expelling it thru the tail boom as a
anti-torque thrust, the cooling fan horsepower for cooling wouldn't be a
total loss, altho it would require extra hp to push the air down the
tail boom, but there seems to be a round outlet like a Hughes turbine
outlet, as well as the air going down the tailboom? At least there is no
tail rotor to clip something, like a plastic bag.
    John Burey.


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