Hi Group:

Is it possible to quantify the diminished smoothness of
the single rotor engine over the std. 2 rotor engine.
One of our helicycle builders group had some concern
that the power pulses of the single rotor could in time
degrade the transmission gears.  BTW, the transmission
is of very high quality and there would be a 6 vee belt
link between the engine and trans.

TIA

Ed Angell

The dotted line is the torque fluctuations of the one rotor.
Very severe to say the least.

Paul Lamar

Paul, care to elaborate on a way to deal with these severe torque fluctuations
so a single rotor engine could be run without tearing a redrive apart?
How does Dave Atkins deal with this problem?
Would a single rotor with pPorts produce enough power at 2800-3000 RPM to
direct drive a wooden propeller?
Royce

I don't think he does. Not many people have run a belt drive on a one rotor
for long I suspect. BIG rubber bushings are called for to connect engine
to gear box or belt drive for that matter.

Here is a picture of what Tracy supplies.
There are rubber bushing under those big washers.

Some use a heavy flywheel but that is out of the question for an aircraft
engine.

Paul Lamar

Hi Paul:
With the weight limitations imposed on the light helicopters, coupled
with having a fairly sophisticated transmission for both rotor systems,
it's starting to look like the single rotor engine might not be very
Practical.  I'm starting to think that a helicopter designed around the
2 rotor engine is probably the way to go, start with the engine first
vs. what we're trying to do with the helicycle.

Ed Angell

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