Manifold Pressure Indicator in P51 - FSIC Messageboard

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Manifold Pressure Indicator in P51

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Author	Topic: Manifold Pressure Indicator in P51
Loco Pilot	posted 03-25- 09:05 AM Hi Fellows, I'd like to know if the manifold pressure indicator in P51(SDOE) isn't functional? I'm asking because this indicator works with some planes but not with the P51. Thanks. IP: Logged
Snake Pilot	posted 03-25- 09:55 AM What does Manifold Pressure mean? Snake IP: Logged
Harman_5 Pilot	posted 03-25- 10:12 AM Correct me if I'm wrong, but isn't manifold pressure the measure of how much suction the engines' pistons are creating in the inlet manifold of the engine and thus the higher the pressure, the more power available since the engine can draw in a greater amount of fuel/air mixture? ------------------ The cannons always shoot slower... Visit FS Online: http://members.xoom.com/harman_5 IP: Logged
Loco Pilot	posted 03-26- 08:10 PM I'm talking about the last indicator in the upper right position of P-51 panel in SDOE. This indicator isn't functional like is in F4u and other planes modeleted in SDOE. Is it true or a bug? Thanks. IP: Logged
jedi Pilot	posted 03-26- 11:22 PM Right now there are 3 ways this is apparently modeled. The P51 has the manifold pressure based on "carb temp." It comes up quickly on startup, and stays up the whole time the engine runs. The engine RPM is based on engine RPM, but the engines are not correctly modeling the effect of a constant speed prop, in which the RPM is set by the pilot, and then the prop will maintain that RPM as boost (manifold pressure) changes by varying prop blade angle. End result: P51 not very realistic on engine readouts. The P-47 has the manifold pressure rigged up the throttle, which is realistic (except that it will read pressure even with the engine shut off). The RPM is based on engine RPM. It works right on engine start and at low speed, but once you're airborne, it will again read 100% RPM all the time like a turboprop. Probably the best compromise tho. The F4U has both manifold pressure and RPM rigged to the throttle. Both instruments show power setting. RPM not necessarily accurate, since constant speed props are adjustable with prop control, but not with throttle. Think Cessna 150 with a boost guage. No "perfect" solution until the actual propeller RPM is able to be monitored by the sim and used for a dataQuery property. ------------------ --jedi-- IP: Logged
Loco Pilot	posted 03-27- 06:20 PM Thanks Jedi. I love the F4Um,It's great! IP: Logged

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