Paul,
Any contra-rotating Mazda 13b 2 engine 4 total rotor (or 2 total rotor)
designs out their? I did like watching the
http://www.electro-flight.com/single-post/2016/07/20/Fully-Chargeds-Robert-LLewellyn-Documents-Electroflight
video demonstration of the output. Any truck transmission planetary gear
sets with contra-rotating outputs? Very likely would set the small
helicopter world on fire.
The Wankel Rotary would be a great application for contra-rotating
propellers, or small helicopter contra-rotating blades & flight control.
If a center line shaft from one engine could be made to pass through the
second e-shaft, connected to a gear hub for both propeller sets.
George F. Curtis Jr.
Take a look at:
http://www.rotaryeng.net/VTOL.html
I don't really know if this is going to work. I have not built it yet.
Not only that some of my assumptions may be wrong so think about it.
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"This gear box is stunning in it's simplicity. Since we are proposing
using the A/C proved Ford eight pound A4OD six pinion planetary in a
differential mode the total gear reduction is 6.34:1. See
http://www.rotaryeng.net/psrus.html. The ring gear is rotating in one
direction and the planet carrier is rotating in the other. As long as
both props have the same drag the RPM's of each prop will be equal. With
an engine RPM of 8000 the rotors will be turning 1262 RPM for take off.
I would use a 13 foot diameter rotor at this RPM."
"There is a possibility that the gear box could start up with both
blades rotating in the same direction. One blade would be going
backwards so that might be sufficient torque load difference to force
the unit into counter rotating mode."
"The over all diameter of this gear box is only about 6.5 to 7 inches.
It should have it's own oil supply as it is on the very front of the
airplane and the engine is at the very rear for weight and balance
reasons. A simple mechanical pitch change design is used. The size of
the aft shaft is the same size as the ring gear. Namely five inches. A
simple butt weld is all we need. One of the results of this is the gear
case now becomes a simple piece of thick wall aluminum tubing about six
inches in diameter and eight or ten inches long. This will allow
increasing the diameter of the front shaft connected to the planet
carrier to four inches. A front shaft needs a lot of torsional and
bending stiffness as it is cantilevered a fair distance out of the gear
box."
"I would use plain bearings, oil filter and an oil cooler with a
dedicated high pressure stock Mazda 13B automatic transmission oil pump
driven off the input shaft. The remaining problem would be high speed
shaft seals."
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BTW this concept was conceived before we had a 200 pound turbo 2 rotor
putting out 650 HP making this project more than doable.
Paul Lamar
Paul,
Stay away from that little brown jug when designing.
Notice I did not say to stop dreaming, march on!
Milo Burrows
I don't drink Milo :-)
It would be a sea change in low cost aircraft design. Able to take off
out of a large backyard,
fly half way across the country at 300 or 400 MPH and land in some one
else's
back yard. The V22 is a pioneer for this concept.
I am serious about this. It is just matter of time until the aviation
industries wakes up to the possibilities of the Wankel rotary.
Unfortunately it may
be in another country not friendly to the US. After WW I, despited the
aircraft restrictions on Germany, Germany took the scientific lead on
aircraft
design and it was not recognized in the US until some of the Jewish air
craft
scientist were forced to leave 20 years later and came to the US in the
early
1930's. People like Von Karmin and Edward Teller. Von Karmin
went to work at Cal Tech. Edward Teller worked on the atomic bomb.
The Wankel itself is another example. The Japanese had the vision to
see the advantages.
The Wright Brothers were recognized in France first and France took the
ball
and ran with it. During WW I they were the leading aircraft designers
among the Allies. French designs were manufactured in the US during
the early part of of the U.S.'s WW I involvement.
I am reading a very well written and researched 500 page book called
"Air Power"
by Stephen Budiansky ISBN 0-670-03285-9.
The book was published in 2004. Very excellent history of the development
of aircraft. Everybody should get a copy and read it.
Wake UP U.S. aircraft engine builders to the myriad possibilities of the
Wankel!!!
However a vibrant economy is essential. If the Democrats get in
office again it is all OVER!!! Vote for Trump!
Paul Lamar
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