Paul,   We have been here many times before and there are many trade
  offs with fitting a turbo to the rotary.    Pluses are in the power
  obtained and noise reduction.  A P port will cost at least $1000
 plus fittings so that cost can go towards the turbo, Then is the
 weight penalty etc.

 To date with your experience in the TTC, just how viable and trouble
  free is the turbo option?

 Neil Unger


 Don't forget we have 650 HP. No alternator or voltage regulator and
 a battery too small to start it. We also have the expensive ($200
 each silicon nitride apex seals. 6 needed.)

 However it starts up every time just like my RX8.

 No problems of any kind. The water is always less than 150 F no
 matter how long we taxi around and wait to take off at a tower
 airport. and the oil creeps up to 170 F but that is with 3 gallons
 of oil and no oil cooler in about 20 minutes of flight

 Last time we flew it a couple of days ago we got to 8000 RPM at 70%
 throttle and the waste gate wide open at 5500 feet alt. The manifold
 pressure got up to 60 inches of Hg.

 We have had it up to 7000 RPM and 85 inches of Hg with the manual
 waste gate closed.

 How much HP do you want?

 What ever HP you want is no problem. The rotary will handle it.

 It is because of the Robust Heart of the Rotary.

 There is at least one guy in Melbourne making aluminum end housing
 and then the weight is less than 200 pounds with the turbo. There is
 not another aircraft engine in the world other than a turbo jet that
 has a better power to weight ratio. You still need the gear box. I
 don't know what your gear box weighs.

 It will cost about 1/10th the cost of an equivalent turboprop engine
 like the PT6 and burn less fuel per HP generated.

 Paul Lamar

Paul,  Fair comment.  What I am suggesting is that to get more HP than
stock say up to 300 HP max it can be done with a turbo without the
expense of P porting, as I said min $1000.   So a saving of $1000 and
you get much more HP with a turbo.  Penalties are the weight of the
turbo etc, but more Hp for little alteration to the base motor.  The
turbo also negates the need for sophisticated mufflers.  All
compromises, wins and losses.  Look forward to continuing this
discussion when you get to OZ. Regards,

Neil Unger

Yes that is true but you pay a small fuel burn penalty with side ports.

I have been thinking about this and what the TTC proves is that... it is possible
to build a three or four rotor version and build a six passenger pressurized
single engine airplane  that will out perform the  popular  P&W PT6 powered versions.
Faster and higher. These airplane cost about a million dollars partly due to the fact
the PT6 alone is a quarter million.

The PT6 runs out of ompf at about 25,000 feet. This is due to the limited
compression ratio of a gas turbine engine. During WW II the
turbo charged fighter planes like the P38 and the P47 would get up to 40,000
feet.  The turbo rotary should do as well or better.

Paul Lamar

Paul, I am thinking 350hp 13b side port with a turbo. with 3.1 reduction the max rpm I want is 8400. the prop needs to be kept below 2700 rpm. isn't the p port for reasons of better breathing, higher rpm/ more hp? with the leakage of compression at apex-pp crossover doesn't the fuel economy suffer more with pp than the side port, not to mention the higher/rougher idle of pp?  who is the maker of the super light end housings in melborne that you mention?

james whitehurst

Internal combustion engine intake systems are aero dynamic devices.
It takes HP to draw or pump air through an aerodynamics device just like it
takes HP to push your airplane through the air. HP burns fuel. The less HP
needed to suck air into your engine the less fuel needed.

Corners are bad news. The side port has a lot of corners. Rough cast
iron surfaces are bad news. Straight in P-ports are the lowest drag.

Mazda used p-ports on the engine that won Le Mans.
Le Mans had a limited amount of fuel available to run the race.
Mazda won the race out right beating all other piston engines
with the same amount of fuel.

If you don't mind higher fuel burn use side ports.

Paul Lamar

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