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.
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
What would be really great, would be a PSRU to drive Contra-rotating
propellers !
Paul, How hard could that design Be ?
Steve Carlisle
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