>> Yes, there is a great market waiting for a good, proven
    one-rotor. It
     >> would take a big bite out of the 100HP market.
     >
     > Agreed!!!!!!
     >>
     >> 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
     >
     > You don't want to know !!
     > George ( down under)
     >
     > George, Extreme Racing charges $3700 Aus for a three
     > rotor shaft. What is the US to Aus exchange dollar for dollar rate
     > right at the moment? Surely they can knock out a one rotor shaft.
     >
     > http://www.xtremerotaries.com/
     >
     > Maybe we can get together and have a group buy on one rotor
     > shafts. If ten people order one rotor shafts from Extreme
     > I am sure they would whip out a batch. They got the billet
     > material in stock and the NC lathe program is more or less done.
     >
     > Paul Lamar ...No rotor no motor.

    Paul,
    I spoke to the chief engineer (X-Treme) they had one made for testing a
    single rotor set-up and wern't interested unless there was an order
    for ten
    at $1,500 ea ($1,200 US). Very expensive IMHO, they would however be
    of a
    high quality.
    I have made a new contact that I should be able to contact next
    week, who
    has his on machining shop (CNC), I've had dealings with his brother and
    others associated with him, so we shall see what come of our
    discussions.
    The exchange rate is about 79 to 80 Austs cents to the US$, X-treme
    have a
    different method of placing the rotor filling jet which may or may
    not be
    the best way to go.
    George (down under)

Please forgive the ignorance, but would`nt a cut-down 13b shaft work for
a single rotor?

--
Erik Snyman
Messina
South Africa.

That is usually the way it is done. Then you need new counter
weights of course... new shaft or cut down shaft. No difference.
One rotor engines wind up costing more than two rotor engines.
It is cheaper to change the type of airplane :)

Paul Lamar ...No rotor no motor.

Erik, Paul.

I really can't understand why you would consider a cut down 13 B e-shaft for
aviation use !!? For proof of concept, such as Richard Sohn is doing, that
is fine.
Would I use a cut down e-shaft  - no way!!
For example, the Mazda shafts are a very common material which will only
take Induction hardening, I assume you intend to re harden the areas
modified - do you have reliable induction hardening available locally, does
the new hardening have any effect on the previous  hardened areas!!??
What do you do with all those extra holes, as well as the new ones you have
to drill.
Your a far braver man than me if you would fly with a modified shaft!
George ( down under)

Where are you getting that stuff from George? :)

There is absolutely nothing wrong with cutting down
an e-shaft. It can be re hardened if necessary.
The size is way overkill for a one rotor therefore
the stress is very very VERY low. the same main and rotor
journal sizes are used on the 900 HP four rotor.