Warm Up Times of Radial Engines.

Originally Posted by BP_Tailspin

Are you talking about warm up before taxi or warm up before takeoff?

For the 2800, after start you want oil 50+ psi within 25/30 secs and then expect oil to hit 40C within 2 or 3 mins at 900/1000 rpm after which you can throttle up over 1000 rpm and typically start taxing. By the time you get to the run-up pad you're more than ready to due as much throttle as you need to, 2300 for mag and prop checks.


Here's a P-47 cold start with two mins to taxi. (Note the smoke which takes forever to clear because of the long exhaust to turbo - most Jugs today don't have this, they have conventional side exhausts at the original waste gate location.)

http://www.youtube.com/watch?v=g9EPQa559Nk

PS. The smoke is from oil that has accumulated in the exhaust system and cylinders since the previous shutdown. Before starting a cold radial (or inverted) engine, always pull the prop through (forward) at least 2 full crankshaft revolutions, usually between (for a three blade prop) 6 and 18 blades, depending on gear reduction.