The Dragonfly/Quickie/QII can handle an O-200 (100HP).

A one-rotor built on the 13B is 100HP, and weighs less.

Atkins has a one-rotor E-shaft available.

Keith

Keith,
The Atkins e-shaft is cast and is therefore unsuitable for aviation use.
Cast materials always have porosity problems - lower density ( lower
strength) with the possibility of casting voids, even a small blemish within
the material  can cause stress risers and intimate failure.

The one rotor with cast iron housings will be about 240 lbs and about 80 to
100 hp, P-port will be closer to 115 to 125 hp, with a higher compression
rotor ( RX8) maybe more. The composite al and iron housings ( being
developed by Richard Sohn) may save you a few lbs. The outrageously priced
aluminium housings will save more.
I forget what the 0-200 weighs.

The price of the ( quality) single e-shaft is the stumbling block at this
point in time - something I'm still working on, however I firmly believe
that there is an area of high demand for this weight and HP class.
George ( down under)

I hadn't known that they were forged instead of machined.

The 13B that I got weighed in at 160 lbs for the "Lifesaver pack"
(assembled end-to-end but without oil pan, intake, exhaust or cooling),
with iron endplates.

That means it should be possible to get the engine in the air at about
the same weight as the O-200.  Cooling isn't counted, but that doesn't
have to be on the engine mount and can be elsewhere.

The DF/Q offers several places to put cooling, including that nice, big,
empty tailcone.  Imagine an adjustable intake built into the top of the
cone, just behind the wing, which would take advantage of the airflow
over the canopy, and a reversed scoop at the bottom to vent.    A little
more engineering would let you sample off some of that waste heat into
the cabin when you want it.

You would need to set the throttle up with a "Battle Emergency Power"
stop that you would flip out of the way for takeoff, then drop into
place to keep below redline during level flight.

Yes, there is a great market waiting for a good, proven one-rotor.  It
would take a big bite out of the 100HP market.

The major stumbling block is the e-shaft -- even with iron endplates it
would have a lighter all-up weight than the O-200.  With aluminum you
would be lighter than the Notax (er, ROTAX) 4-strokes.  I wonder what it
would cost to make them the right way?

Keith

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