I am thinking of machining a batch of one rotor e-shafts.

If your interested I will put you on the list.

Paul Lamar

Hi Paul,

Can you provide some additional details around the expected specs of
a single rotor engine? Weight, expected hp naturally aspirated,
expected hp turbocharged, likely engine dimensions etc

Thanks!

Matt Humble.


About 150 pounds plus or minus 25 pounds less the gear box. Of
course that is assuming racing beat alloy end housings.

We should be able to get the gear box down to less than 35 pounds
with a redesign. Still working on that.

It would be about 130 HP at 7000 RPM with a P-port

It is real easy to add a small turbo because it can be bolted
directly to the rotor housing. Based on what we have learned with
the TTC engine 250 to 275 HP would be available.

One should be able to set an altitude and speed record in the lower
weight classes.

Paul Lamar

Paul, Hope this message comes out in the right way for you, it's
g-mail which I really don't like.

I could be interested in a single rotor e-shaft or two depending on
the price and I would also be interested in set of aluminum end
plates for a PP single.

In the last few months there have been some amazing acheivements in
aviation . Electric flight across the Atlantic  and then around the
world. Truly amazing feats yet almost completely overlooked by the
media. Your work on the TTC is going to be more of the same, a truly
great achievement but primarily it will only be noticed by us rotor
heads, so it is sort of like singing to the choir, so to speak.

To my mind (which seems to be wrong more times than right) for the
rotary to suceed in aircraft it needs numbers. Turbine beating
marvels like the TTC are great but they are only for a few players.
Those that can afford the fuel can easily buy a PT6  or a Walter
that is more or less bolt on, if not indeed just buy a King Air or
Citation all ready to go. There a a lot more of us little fish who
need to find a way to get the burger back down to just a hundred
dollars. We're more likey the ones to get the rotary the exposure it
deserves and a single rotor  at 100-150 hp is just the ticket.If the
there was an affordable source for the shafts and light end plates
then there should be a rise in the number of rotaries taking to the
air. (and it would make me happy)

John

I agree with all that. A single rotor Mazda is atomic bomb proof.

For one thing it uses the same e-shaft diameter as the 2 rotor 650
HP time to climb engine also 3 and 4 rotor engines putting out well
over a 1000 HP.

You could easily turbo a one rotor and get well over 250 HP.

Not bad for a 99 pound engine.

Those electric airplanes are spectacular but impractical. Zero pay
load. Perfect weather only.

Paul Lamar

I would be really interested in this eshaft. I would want to buy
one.

Zoltan Szakaly

The procedure is this you buy the e-shaft and send it to me. Check
E-bay. Or buy an engine and take the shaft out.

When I get ten shafts I will start machining.


Paul Lamar

All good info Paul, it just seemed like you wanted to boost the
engine back up again ☺

There is almost no penalty in it. If your going cross cross country
it is a good way to get there faster and less fuel at high altitude.

In my experience the only practical cross country aircraft  is one
that flies 200 MPH.  All too often you will have a head wind. In
that case with a 100 HP airplane you could get there faster by
driving. I have had my C182 back and fourth to the east coast and
down to the tip of Baja many times and twice up to Alaska.

Joe Rogi

I am thinking of making a gyrocopter with a 13*B* two rotor but I am
thinking a one rotor might be more economical. I guess it depends on
altitude and airspeed.

Zoltan Szakaly

Here is a great two place 12A.

Paul Lamar

Paul, do you have any idea how much you’d like to charge for each
e-shaft?

Dave Klingler

I would guess about $300. I need to do a bit more research as the
front main bearing surface will require grinding. The grinder
company would be more interested in ten at a time.

Starting from scratch in steel billet is much more expensive as the
shaft is hollow and that would probably require gun drilling among
other complex lathe set ups. The rotor bearing surface would also
require grinding.

Paul Lamar


Wouldnt the e-shafts also need to be hardened? At least at all bearing journals? Or nitrided? John talks about needing to do this for his 2 piece 4 rotor e-shaft

http://www.rx7club.com/build-threads-294/4-rotor-fc-build-974831/

Easily the greatest automotive build thread of ALL time.

Dan Gorsline.

Not necessarily. The stress in a one rotor front main is extremely low.

Paul Lamar

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