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 think you're still missing the point ☺
   Lots of pilots out there can't afford 250 hp. I think 100 to 150 is a much larger pool.

   Joe Rogi

Of course I know that. What do you want to know. The price? The weight? The cost
of the gear box? What do you want me to say? :-)

Most 100 HP aircraft engines are $20,000 and UP.

A new Mazda RX8 engine is about $5000.  That where you get most of the parts.

RB aluminum end housing are $3000.  Let 's say fro the moment cutting the
shaft down cost $500.

Now we are up to $8,500.
Now you can use Neil Ungers gear box at $5000
NC Machining is not free.

So we are up to $13,500

The weight is now 150 pounds.  My guess on the cooling system is
another 20 pounds.

So the key for lower cost is find a good used RX8 or 13B engine.

Maybe eventfully we can get the cost of the gear box down as Neil's
box is good for 250 HP and we need only 120 HP. I doubt it will be
much cheaper as the gears themselves are only $200.

The real savings are when you need to overhaul the rotary engine if ever.

Some of those 100 HP LSA engines you need to almost throw
them away at 1500 hours.

An over haul on an O-200 is at least $15,000

Paul Lamar


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