Sir,
I may be missing something here, If the maximum propeller rpm is
2800 . A single rotor engine with max rpm of 1100 with 37 KW @ 8750
rpm. With a reduction drive of 3:1 one could achieve maximum
propeller rpm of 2800.
Why can't this engine with low HP but with high rpm be used on the
Parsons auto gyro ( on YouTube
https://youtu.be/QOwb8QRHrMY )which
is currently using the 12a Mazda rotary or can it ?
Best Regards Zahid Rahman
I 37 KW is only 50 HP. A Mazda 12A 2 rotor makes at least 150 HP.
Gyro's, like everything else, fly on HP. It probably takes a minimum
of 110 HP to fly a man carrying gyro.
Paul Lamar
We just need a modern version of the Hiller Rotorcycle :
https://en.m.wikipedia.org/wiki/Hiller_YROE
50hp would be more than enough!
-Dan G.
Actually, it wouldn't, if you want the helicopter to do useful things
besides hover in ground effect at sea level. Paul's number of 110 hp
for a single man carrying gyro is about right, and 150+ hp for a
single man carrying VTOL aircraft, 200 hp for a very light two-seater
like a Robinson R22. Yes, you can store a bit of energy to make a
jump takeoff in a gyroplane if you're lucky. The design boffins at
NASA Langley who are looking at all kinds of wild designs come up
with the same numbers. No avoiding the fact that if you want to hover
you need to produce as much thrust as it weighs, plus a margin to
allow for wind.
David Josephson
50 HP is the top power of the 294 cc per chamber Aixro kart engines,
liquid cooled housing, charge cooled rotor, however, this is a peak
power, not feasible for a sustained time, and no Wankel engine has
an FAA certification for aircraft use, few have a double
spark/ignition system system, that may be a minimum requirement for a
safer airplane use; glow plugs that would solve this issue are not
available in the market, and the producer of the engine in the light
Canard
www.e-go.me warns that they sell only to this individual
airplane builder. Some other engine makers may be found, but it's
not clear at all if it are currently under production.
I've purchased an old KM-48 engine, fitted with a reduction gearbox
to move a concrete mixer, but with 10 HP it has little aviation
usefulness. 150 HP are close to the power of the early La Cierva
Autogyros, I can't imagine the reason why you may need 150 HP for a
Gyrocopter less than a 20% the weight of a full size Autogyro. I
asked in this forum about the reason for gyrocopters not having the
articulated blade roots that allowed first, autogyros, and then
helicopters to fly, but I don't remember any response, yes, latest
helicopters, starting by the Bolkow, had rigid rotors that left the
materials in the blades make the adjustment of pitch and incidence
that the articulated rotor had, but this is for helicopters, not for
autogyros/gyrocopters, and this is a RCE site, not an aviation one.
Does anybody offer for sale a single rotor engine, based in the
Mazda 13B housings?
Thanks, have a nice season, best regards, + salut Jose Gros-Aymerich
Alexander Schleicher has sold over 500 motor gliders with single
rotor 50 HP or 56 HP Austro Engines. The rotor is air cooled with
an external blower. The engine has no recommended TBO. In other
words it is intended to lasts forever.
It is FAA certified of course as otherwise AS would not be able to
sell it. Austro also has a 2 rotor version of this engine that is FAA
certified.
http://www.alexander-schleicher.de/en/flugzeuge/ask-21-mi/
Aixro have a prototype engine running with a pressurized oil
system. A oil cooled rotor will eventually be available. This will
solve the continuous HP rating problem and make it just like the
Mazda.
Paul Lamar
Here I am thinking I have flown many hours in gyros only to now find it
can't be done!😩
I started out with direct drive 1800 cc VW, the prop was 52 inch
limiting rpm to under 3000, above that it was just noise as the tips
went transonic.
We built 1.85:1 tooth belt reduction allowing the rpm to go to 4500.
Performance was quite good. We reckon it had about 80 hp.
The Subaru EA 81 would have had similar hp.
Health problems brought an end to my ambitions of completing a Tractor
gyro powered by a turbo Mazda 12A rotary. It was to be jump take off
machine. We elected to run the drive shaft up to the centre of the hub
bar, but I couldn't find a suitable light gearbox, it needed to handle
120 ft lbs to overspeed the rotor. The best rotor rpm I saw was just
under 200 before various gearboxes failed, we were looking for about 550.
The rotor pitch change worked well so we could comply with Oz
requirements to only change pitch FOR flight not IN flight, although I
Thought it would be great to overspeed the rotor on approach by
partially de pitching it to store energy in it and then have control
over the amount of lift as you settle on.
I'd love someone to finish the project.
John Evans
Maybe I should have said plus or minus 20.
What did you weigh John when you did that?
What type of carbs were you using on the VW?
What did you do to the displacement?
The original engines were about 36 HP as I recall.
Paul Lamar
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