Hello Guys , I have one question regarding a vertical
installation.
If I isolate the oil circuit with a sump pump and have
the oil tank separated from the engine.
Do you think It would create problem for the engine to
run?
Thank you
Frank
Sustained vertical operation.
I can't say for sure because I have never seen this done.
I am also sure the devil is in the details so it depends
on how well the scavenging system is designed. You would be on
the bleeding edge. You will probably need a scavenge
pump to extract the oil from behind the rear main bearing.
If you don't do this the rear main bearing might overheat.
The other major problem might be... you may not get oil flowing
out of
the lower rotor. The rotor may merely fill up with oil allowing
no cool oil to flow in. Effective rotor cooling depends on a
constant flow
of cool oil. Therefore the oil cooling of the lower rotor
may not function.
You won't know all this until you try.
It would be safer to use a bevel gear box and run the
engine as Mazda designed it to run.
In VTOL use vertical operations are used for only a few seconds
while
landing and taking off.
Paul Lamar ...No rotor no motor.
Paul,
You've said it at least once before, but I think expecting VTOL
to not
spend much time hovering is unrealistic. Before I'd consider
flying it,
I'd want to hover the thing for several hours - just to figure out
how.. And then, people are going to hover taxi from where they
start up
to a safe location from which to depart. Vertical departures
from the
tie down are going to blow the neighbors around -
unpopular. Finally, I
wonder about the approach method. Do you expect that a normal
approach
will be flown (with a traffic pattern)? In what configuration?
Translation from wing lifting to rotor lifting at low speed
close to the
ground? The Ospreys transition from forward configuration to
vertical
while still on the downwind - was watching them at Kirtland AFB
a couple
of weeks ago..
Regards,
Matt-
Thanks Matt.
Testing is another matter. One might have to limit the time one
tests
in the vertical mode to insure the engine does not over heat.
If it is a heliopad vertical departures from the tie down
blowing the
neighbors around is normal. You can not taxi a skid helicopter
with out
first lifting off.
I envision a normal high angle of attack approach with a complete
transition
to vertical on short final. A modified flare if you will. Previous
delta wing
airplanes approached at a high angles of attack anyway. Lacking
adequate thrust
and control they could and did get in the back side of the power
curve mode
which generally resulted in a crash. Particularly the jet powered
deltas
as they had little or no roll control. They had no prop wash over
the tail.
We have the thrust and we have the pitch control at angles of
attack all
the way up to 90 degrees. Roll control is provided by both the
variable thrust vector angles (both lateral and fore and aft)
and the prop wash over the elevons.
The V22 Osprey was sold as both a helicopter AND a normal airplane.
I think that is unrealistic for what I have in mind. Super
efficient
high speed cross country travel with VTOL only. It is not an
adequate
helicopter IMHO.
--
Paul Lamar ...No rotor no motor.
Okay Paul, fair enough..
I'd be interested in seeing a scale model fly. One without any
gyro
help (which the RC helicopters use).
Regards,
Matt-
Perry might be working on one.
--
Paul Lamar ...No rotor no motor.
Yes, I am going to build one. I still need a 1/4 to 1/5 scale planetary
gear set.
I have a file P-1603-BG_cat-Gearhead-pg29-34.pdf
I think you sent that out? PL5 series, which model do you think would be
best?
Perry
Are we using a model rotary engine to drive it? :)
http://www.osaka-asia.org/en/companies/nitto-kosakusyo/
Not much on the web site
I would go with the PL5050 at 1.32 pounds weight. 10:1 ratio.
Max allowable out put torque would be 14 Nm or 10 foot pounds.
My guess is the Nitto rotary is 2 HP at 20,000 RPM
Torque is then
HP = Torque x RPM/ 5252
2 * 5252/ 20,000 = Torque .525 foot pound.
10:1 ratio is about right so 5.252 foot pounds max coming out of the
gear box at 2000 RPM. Hard to say what the static trust is.
I am guessing on the HP of the Nitto. So far I have not been
able to find out what it is.
Well I would be surprised if the torque out of the engine was
more than 2 foot pounds.
Paul Lamar ...No rotor no motor.
Why kill yourself with a gas engine? Use an electric motor designed to
run in an RC chopper..
This page references one with counter rotating blades.
http://www.rc-airplane-world.com/electric-rc-helicopters.html
They must already have a gearbox..
Regards,
Matt-
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