Originally Posted By: Johnny2Bad
Did anyone dig into the specs?
2,220 HP
Maximum RPM 2,750
Correction... 2,750 is the maximum propeller RPM... the crankshaft RPM
could go as high as 3,700 RPM... Rolls Royce V12 engines employ a
single spur gear reduction of 0.98 ratio to multiply the crankshaft
torque and to lowered the propeller RPM... Propellers are most
effective at subsonic airspeeds 480mph to 512mph any higher and you
risk the blade tips speed going supersonic with deadly shockwaves
producing high drag and related mechanical problems... basically the
more prop noise you hear the less efficient thrust you get...
Its the Merlin but your get the layout
My finger is touching the crank on a blown Griffon Reno Air Races...
480mph was possible by trimming the props diameter for 2008 winner Strega...