This is just the first guess. I'll try two openings next. One on the
   left on the cowl  and one on the bottom of the cowl.

   If the PSRU is integrated into the front cover that will act as a
   huge heat sink. A few fins here and there might be advisable.


   ------------------------------------------------------

   Here it is with a 10 inch spinner. Two cooling baffles. One under the
   spinner and one on the upper left from the pilots point of view. Much
   better than one opening. These are 4 inch diameter openings.

   This is going to make one heck of a very low cost  LSA engine.

   I think we should sell it at the same price as a Rotax 912.


   Paul Lamar



   The heat sink material could be bought in full length, cut to the
   length needed,  machined with bolt flanges on the side to allow the
   heatsink to be bolted to the end plate edges. No fasteners in the
   rotor housing. Just an option.

   Steve Carlisle

You need a good clamping force on the heat sinks so studs welded to
the rotor housing are advisable.

With the exhaust and the intake mounted down we could go forward
with the intake and use a side draft Rotec/Eillison  carb under the
front of the engine.

Paul Lamar


Hi Paul
Do the drawings depict a pusher or tractor configuration ?
How would you contemplate welding the studs to the housing ? Electrical
resistance but weld, Tig etc
Regards

Bill McDonald

Tig, gas or braze :-) Anything will work. Just machine a small clearance
depression
in the back of the  heat sink around the stud hole to accommodate the
weld area.

----------------------------------------------------

This just blew me away. I could hardly believe it. I double checked
the scaling. There is nothing in the RV12 Cowl !!! :-)

This is a 120 HP one rotor air cooled Mazda in a Vans RV12 LSA.

The RV12 spinner is almost as big as the engine.

Its those high density heat sinks that make this possible.

This is going to be big. Real BIG. Imagine taking this to an airshow
and making a "high speed" pass, then pulling up to a sustained
steep climb and then coming back landing and parking. Opening the cowl
for interested customers after they hear the strange noise
 and finding all that space.  Shesss!!!!

I almost forgot the oil cooler :-)

Paul Lamar

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