Paul,
Here is a better photo of the helicopter with the Mazda engine.
John McEverett

I too have that picture.

I looked up the messages on it and apparently it is not far
from where I live as I went to his hangar to see it.
I got his name and phone number from ebay but did not record.

Unfortunately I don't have his name yet. I did assess
the cooling system as inadequate but easy to fix.

Here is my assessment at the time.
===================================================================
 Here are a few pictures. The plumbing needs to be changed for the  water
cooling.  So too the fuel supply plumbing needs to be switched over to AN.
You don't want to stake your life on 35 cent hose clamps.  The big question
is the FAA going to take kindly to a certified aircraft with a rotary
engine?  I think they frown on this or aircraft everybody would be doing it
to bypass the annual inspection requirements.  Check with your local FSDO
The engine is stock everything so it started life with 160 HP or so.  A
large fan has been mounted on the water pump shaft and my guess it is
sucking down 20 to 30 HP at 6000 to 7000 RPM.  Net HP out of the engine,
depending on the exact reduction ratio, is about 130 to 140.  Too little for
this large helicopter.  The answer is to p-port the stock engine and or
trash the fan and move the rad and oil cooler from in front of the engine up
underneath the rotor blades horizontally oriented for max air flow.
============================================================================


Paul Lamar