New rotorcraft concepts

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EzyBuildWing

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Littlewing tractor-Autogyro with an MZ-201 60 HP and a simple overhead control-stick (like Cierva C-30 had) and a large diameter propeller, would be super-awesome.

 

henryk

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coaxial adds unnecessary complexity and loss.

=auer coaxial CR rotors have different diameters,
but we get gearless,REACTIONless drive system !!!


=CRFLIGHT principe=the electric motor works as Differential Reductor=NO beavals (?),
only + sliding contacts on the stator !

=with mechanic Diff. Reductor we gain circa 30 % more thrust.
 

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EzyBuildWing

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Post #159 15 kG thrust from 0.96 kW battery power !

This is awesome! That's about 30 lbs of static thrust per HP.
So a 600 lb MTOW heli would require about 20 HP to hover?
If yes, bring it on!
 

henryk

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That's about 30 lbs of static thrust per HP.
So a 600 lb MTOW heli would require about 20 HP to hover?
If yes, bring it on!
=Specific Thrust is function of propeller Disc Loading...

iff you have the same DL=15 kG/m^2 (i.e. 20*1 m^2=20 m^2) you can achive 300 kG
of thrust force.

-in auer KASPERWING (20 HP) we have 80 kG of thrust...(D=1.3 m)
 

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Sockmonkey

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Flint, Mi, USA
Coaxial systems are typically envisioned to recover swirl loses, but at low disk loading swirl loses are very small. From "Fundamentals of Helicopter Dynamics" by C. Venkatesan, page 23 - typical single rotor helicopter has about 1% swirl loss - there is not too much to recover. From the same book - non uniform inflow is responsible with 5-7% loses.

From "Principles of helicopter aerodynamics" by J Gordon Leishman, page 101, non-separated coaxial has 41% increase in induced power vs separate rotors.

So my opinion is - coaxial adds unnecessary complexity and loss. It's better to use a single rotor and straightening vanes to get rid of the torque.
They do have side advantage of opposing gyroscopic forces, which may be desireable.
 

henryk

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=Specific Thrust is function of propeller Disc Loading...

iff you have the same DL=15 kG/m^2 (i.e. 20*1 m^2=20 m^2) you can achive 300 kG
of thrust force.

-in auer KASPERWING (20 HP) we have 80 kG of thrust...(D=1.3 m)
=low disc loading (15 kG/m^2) =16 kG/kW !!!=
 

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