New rotorcraft concepts

[EzyBuildWing]

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]

coaxial adds unnecessary complexity and loss.

New rotorcraft concepts

it wasn’t successful commercially because of the noise generated by the rotor tip jet engines which use compressed air from the thrust engines pumped down the hollow blades and mixed with fuel at the tips, this prevented its primary use which was to transport passengers to and from City centres...

www.homebuiltairplanes.com

=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.

 

[EzyBuildWing]

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]

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)

 

[Sockmonkey]

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]

=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 !!!=

 

[EzyBuildWing]

Looks super-cute.......

 

[D Hillberg]

Looks super-cute.......

Vanvorhee ---- Rotorworks ---- Pit Bull

 

[John.Roo]

Looks super-cute.......

"Tractor" gyroplanes.... pitty that they are not many.
Little Wing, Pitbull and oldimers like Cierva or Pitcairn.... so beautifull flying machines



Also concepts from Jukka Tervamaki are nice

JT-9 Autogyro

https://www.tervis.fidisk.fi/JTsite/jt9/jt9taildragger.pdf

 

[John.Roo]

This concept from Poland was looking really interesting

https://dspace-erf.nlr.nl/xmlui/bitstream/handle/20.500.11881/3704/ERF2016_25_D.%20ULMA%20_P.pdf?sequence=1&isAllowed=y

 

[henryk]

This concept

="tractor"=popular concept,
f.e.spain FENIX (with BRS in tail ="red disc"!)



-but gyrocopter have big disadventage=low L/D (big rotor drag !)

 

[Erik Snyman]

X2 hybrid =
"Interestingly, most of the power goes to the pusher prop at high speeds, and very little goes to the main rotor. "

-auer,much simpler solution=

-my Fellow was invented new type of rotorcraft=autogyro with conter rotating
rotors drived all flying time=with max power in VTOL regime and low power
in cruise regime.

=the electric energy is generated with starter/generator maschine drived via IC motor.(for long time fly).

this motor drives conter rotating propellers for thrust (high speed,low rotor drag).

BTW=specific thrust is 3-15 kG/kW (95 kG/qm and 12 kG/qm)

Hello Henryk. This is the system I was looking for info on.
Thanks,
Erik.

 

[galapoola]

Looks super-cute.......

Except for the screaming 2 cycle, I like

 

[henryk]

Hello Henryk. This is the system I was looking for info on.
Thanks,
Erik.

-look e-mail...

PS=for involving 3-mode system

1=heli mode take off/landing,
2=classic autogyro mode,
2= semi-autogyro mode with permament rotors drive (reactionless)

we must construct passive change in AoA rotor blades...
(or hand adjusted)

=the bigger RPM, the greater AoA.

 

[EzyBuildWing]

Awesome Tractor-Gyro.....from Finland.....

 

[EzyBuildWing]

Anyone know if it ever flew? Looks a work of Art!!!!

 

[erkki67]

But why are the tractor gyros not very popular?

 

[Riggerrob]

Anyone know if it ever flew? Looks a work of Art!!!!

As for the blue swastika in an white circle on the rudder ... Please remember that Finns, Estonians, Lithuanians, Bhuddists and Sioux used swastikas as good luck charms for a good thousand years befor ethe symbol was hijacked by Adolf Hitler and his ill-fated band of German National Socialists.
Also remember that the Norse runic alphabetic was popular in Scandinavia, Ukraine, Russia, etc. for more than a thousand years before it was hijacked by Nazis, Azov Brigade, etc.

 

[dukkbutt]

But why are the tractor gyros not very popular?

Tractor props are destabilizing, pushers are stabilizing. That's one reason early flying wings that switched from props to jets had stability issues.

 

[rotax618]

Isn’t a jet a pusher?