![]() ![]() Used to control and slow a windmilling propeller. ![]() This value is the power required to turn an engine that is not running. The actual RPM needs to be more than idlerpm * 0.8 for the engine to start running. Loads placed on the engine by the propeller and throttle will further limit RPM achieved in practice. Current default value is 40% of the maximum horsepower value.Ī value specifying the maximum RPM the unloaded starter motor can achieve. This number models how efficient the aircraft cooling system is.Ī value specifying the zero RPM torque in lb*ft the starter motor provides. This number creates a pressure increase with an increase in dynamic pressure (aircraft speed). Increasing it reduces available manifold pressure. This number is the pressure drop across the intake system. The nominal volumetric efficiency of the engine. This number may need to be lowered slightly from actual BSFC numbers because some internal engine losses are modeled separately. The actual pressure multiplier of the supercharger system is calculated at initialisation from this value. Beyond this altitude the manifold pressure must drop, since the supercharger is now at maximum unregulated output. Up to this altitude the boost is maintained constant for a given throttle position by the BCV or wastegate. The altitude up to which rated boost can be maintained. The rpm at which rated boost is developed The absolute rated boost above sea level ambient (14.7 PSI, 29.92 inHg) for a given boost speed, in psi On manual shifting the boost speeds is accomplished by controlling propulsion/engine/boostspeed Whether a multispeed supercharger will manually or automatically shift boost speeds. A value entered will be used as a multiplier to the power required to compress the input air. No known engine more than 3, although some German engines apparently had a continuously variable-speed supercharger.īoost-loss-factor - zero (or not present) for 'free' supercharging. Merlin XII had 1 speed, Merlin 61 had 2, a late Griffon engine apparently had 3. This corresponds to the number of supercharger speeds. Zero (or not present) for a naturally-aspirated engine, either 1, 2 or 3 for a boosted engine. It also affects oil pressure among other things. This value is used to calculate air-box resistance and BSFC. The engine starts running when it reaches 80% of this value. This value affects the throttle fall off and the engine stops running if it is slowed below 80% of this value. Currently only the 4 stroke engine is supported. Used to control and slow a windmilling propeller.ĭesignate a 2 or 4 stroke engine. It also determines the starter motor power. It will determine bsfc if that tag is not input. This value is the nominal power the engine creates at maxrpm. This is the percentage drop in horsepower for single magneto operation. The compression ratio affects the change in volumetric efficiency with altitude. A larger value slows changes in engine temperature Number of cylinders scales the cylinder head mass. A longer stroke results in an engine that does not work as well at higher speeds. Piston stroke is used to determine the mean piston speed. This value is used to determine mass air and fuel flow which impacts engine power and cooling. Along with maxrpm it determines the resistance of the aircraft's intake system. ![]() This value is the nomial maximum manifold pressure at sea-level without boost. Along with idlerpm, it determines the throttle response slope. This value is the nominal idle manifold pressure at sea-level without boost. ![]()
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