29.09.2012, 02:52
What I mean as engine installation is how the engine is installed and integrated in the fuselage. For instance the P-47 turbocompressor is installed in the aft section of the fuselage and connected to the air intake (which for the P-47 is a dynamic intake, as far as I remember) which lies in the lower lobe of the engine mount and completely immersed in the propwash. I do not remember precisely how this is done on the Corsair.
The engine regime limitation consists in the time you are allowed to run your engine at a specified rpm and manifold pressure (since indicated average pressure in the cylinders will depend on that). So the 5 minutes limit start, so to speak, when you start running at the rpms and manifold pressure indicated in the AFM.
The engine damage occurrs after exceeding engine regime time limit independently of overheat.
Of course exceeding prescribed maximum rpms and manifold pressure reduces the engine time limit.
This you see fairly clearly on fixed propeller pitch engines or in airplanes with damaged propeller pitch governor.
The overheat message does not appear after a fixed specified time. The Oil and Water outlet temperature variation law depends on engine setting, rad position and most importantly airplane speed (apart the obvious dependency on OAT).
I'll try to expand a bit on the RAM later.
regards,
Aaken
The engine regime limitation consists in the time you are allowed to run your engine at a specified rpm and manifold pressure (since indicated average pressure in the cylinders will depend on that). So the 5 minutes limit start, so to speak, when you start running at the rpms and manifold pressure indicated in the AFM.
The engine damage occurrs after exceeding engine regime time limit independently of overheat.
Of course exceeding prescribed maximum rpms and manifold pressure reduces the engine time limit.
This you see fairly clearly on fixed propeller pitch engines or in airplanes with damaged propeller pitch governor.
The overheat message does not appear after a fixed specified time. The Oil and Water outlet temperature variation law depends on engine setting, rad position and most importantly airplane speed (apart the obvious dependency on OAT).
I'll try to expand a bit on the RAM later.
regards,
Aaken