Hi Paul,

    Having read your website,

    There are a number of WHATIF flies buzzing around my head if you would be kind enough to swat them for me for a good night sleep.

    1. "It takes HP to suck the combustion air into the engine" .

    Does that mean you simply allow more air to go to the combustion chamber with no MORE EXTRA in FUEL resulting in greater output HP ?

    1a) By Output Horsepower my understand is the flywheel will achieve 1000rpm in less time and the flywheel will overcome friction/resistance using same amount of fuel.

    2. If my above assumption of more air no extra fuel is correct then an ECU like Megasquirt simply continues to squirt (using direct injection) same amount of fuel into the combustion chamber and firing the spark at the appropriate time ?


    3. To harness the extra Horse Power and rev up the engine you suggested using the new side throttle system with p-port. Does that mean the using VERNIER CONTROL Is that the new throttle cable. But I am wondering there must be some sensor which tells the ECU as you pull the cable to allow more air fuel into the combustion before the usual sparking ?


    4. As far the Megasquirt is concerned should it continue to behave same usual

    even if the engine wasn't p-ported with reference to amount of fuel to squirt and then spark.


    5. If my aircraft has an all in weight of 450kg including engine,pilot, wallet . I have fuel tank of say 80 litres. I want the fuel to last as long as possible which engine should I use 13b , 13b P-port, 13b Turbo , 16b , 16b P-port , 16b Turbo , 13b Turbo Compound or another option ?


    Regards

    Zahid Rahman


    1. The fuel air ratio must be maintained. It all has to do with BSFC. Brake Specific Fuel Consumption.
         This is the weight of fuel burned per HP out of the engine. Google BSFC.


    1a. Yes the engine will accelerate faster but HP is not the only factor. Rotating inertia is a major factor.

    2. Mega Squirt maintains the correct fuel air ratio.

    3. A slide throttle reduces in internal aerodynamic drag of the intake system.

    4. Same answer as 2. The sensor is either a mass airflow sensor or simply the intake manifold
        pressure and  air temperature.

    5. For best BSFC use a turbo compound RX8 engine. Soon to be available from Mazda.
        May not be P-port so a lower BFSC would be possible with a turbo compound P-port.

    Paul Lamar


When is it appropriate to use reduction ratios 2.85 and when should one use 3.17.

The reverse rotation also available with Ford of 2.17:1 and 1.85:1 , is it used with piston engines because they turn in the opposite direction to the rotary.

Zahid Rahman

HP is RPM times torque.

Most aircraft piston engines turn in the same direction as the rotary.

Are you a pilot?

Paul Lamar

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