I added a few detail pictures to Randy's collection on his one rotor
  powered
  DragonFly.

  It has a very interesting idea in that the Ellison carb is mounted
  directly on
  the intake side of the turbo charger.
  A very compact way to handle the intake system.
  The turbo charger is not Mazda so it might be large enough to live with
a
  one
  rotor. I suggested a Garrett turbo charger tachometer kit to keep an eye
  on the
  turbine RPM.

  All and all a pretty good installation job with the possible exception
of
  the
  motor mount. The belt drive also needs a few improvements to the
torsional
  stiffness. A minor thing to improve.

  We were not able to identify the ignition system yet but it looks pretty
  straight forward using what appears to be an early Mazda magnetic crank
  angle
  sensor distributor. I think the coils came from Ellison but I am not
sure
  about
  that.

  The water pump housing is custom but I do not recognize the cartridge.
It
  is
  from something other than a Mazda. The two oil coolers are a needless
  complication when one larger one will do. One of the oil coolers is in
the
  vicinity of the sharp exhaust pipe bend so the bend radius would benefit
  from
  the removal of that oil cooler.

  I suggest something from the Setrab catalog pdf attached.

  If the turbo charger could be rotated
  180 degrees that would put the exhaust in the rear and the carb in front
  which
  would benefit both.

  All of the cooling openings need the application of Kays and London's or
  Kuchemann and Weber diffusers.
  The water cooler is the quick and simple type under the fuse behind the
  cockpit
  which is very good way to go on this airplane as it has limited volume
  under the
  cowl.

  There is nothing really wrong with it and I think it will fly as is.
  Keeping the
  turbo charger would make it a great cross country aircraft as speed up
  high
  would be spectacular for a such an aircraft. It would probably be the
only
  turbo
  charged DragonFly in the world.

  Ed Carver and I were trying to talk Randy into keeping the rotary :)

  Paul Lamar


  Paul,
  Thanks for coming out and talking with me yesterday, I learned a lot.
For
  now
  you have convinced me to sit tight with this engine till I know more
about
  it.
  I plan on weighing it to see where I stand.  If it's 250 lbs or less
I'll
  keep
  it, more than that and I'll see where I might be able to cost
effectively
  reduce
  some weight.
  Thanks for the cooling information and I will look into rotating the
  turbo, that
  makes a lot of sense.
  How do I go about sizing the oil  cooler for this engine, is there a
  formula or
  just go big and restrict air flow till I get the temps where they should
  be?
  I'll check on my laser machining source and send you the contacts name.
  Randy

  The stock RX8 Mazda oil cooler is about 10" by 10" by 2" thick.
  Core volume is therefor about 200 cubic inches. There are two of
  them on the high power RX8 240 HP engine. One ahead of each front wheel.

  We have found the earlier RX7 oil coolers to be adequate for aircraft
  use so I assume the RX8 coolers are at least as good.

  Bottom line... one 10" by 10" by 2" should work for a 120 HP one rotor
  IF it has a good diffuser duct ahead of it and the back side is not
  blocked.

  Looks like a Setrab A34S22 will work. Nobody has reported
  any problems with this Setrab company so it is a good bet.

  Paul Lamar


Paul,
RX-8 oil cooler, excellent quality, have fan to go behind it. If you like
I will
bring the fan. milo

You bet. All parts welcome.

Thanks Milo

BTW Randy let me know when you want to visit the hangar in SZP. I have
lots of
bit and pieces so you can see what the inside of a rotary looks like.

Paul Lamar


Paul,
Looking at your suggestion of using a Dodge Neon radiator I find two
sizes.  One
for a standard transmission the other for automatic.
This brings up two questions.  Is the automatic tranny cooler (built in)
just
extra weight or is the greater area overall better?
Secondly could the Auto tranny cooler be used for oil cooling or is it not
sufficient?  I would preferr to use the smaller one if it would work.

Here are a couple jpg's of what I found.

By the way, if you are around next week I would love to stop by and see
your
shop.  I would also like to buy a copy of your Cold Wanker book ;) while
I'm there.
Seems like I will be needing it.
Randy


I think the auto tranny version has the tranny cooler built in.
Not what you need. The small one should be OK if it
does not have the tranny cooler.

I have a Neon rad so when you come by I can show it to you.
I actually I have two and I was going to get my favorite tig welder
to build me a cross counter flow version one of these days.
However that is down on the priorities list as it is way
more expensive to build.

Yours look a bit different.

I am here all the time so let me know when you are going to
come by and I will meet you at SZP. Milo is dropping off
a running engine on a trailer on the 19th so that would
be a good time. We can start it up and run it I hope.

If you just can't wait any day from now on would be fine.


Paul Lamar

Paul,
I have removed the prop and several other parts, because of the weather, for
the trip to your shop, so it will take a bit before it is ready to run.
We are still planning to be at your shop between 0900-1200 on the 20th, we
leave here on the 19th. milo

OK Milo. Thanks.

Paul Lamar