Stumbled across a training film last night, and I have to confess a bit of ignorance, as a complete non-pilot. When they say 30 inches of manifold pressure, is that essentially no boost at idle, at ground level? (around the 3 minute mark). Later on takeoff manifold pressure was 45-50 inches. I see that 2 inches of mercury is 1psi, but I'm not sure if they subtract off the 15psi at sea level. How do I correspond that into boost that an automotive engine would be? Also, at 7:35 rudder control is set to 1.5 degree right, instead of neutral. Why is that? [This I suspect will be beyond my understanding.] I suspect that the prop impacts a rotational force on the plane, but I don't see how rudder would be used to counteract that. Lastly, I like how they use gallons of fuel yet temps are in Celsius. Odd mix of units back then.
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