Recent content by P-STICKNEY

THe answer, as with pretty much anything else in aviation, is "That Depends." Some 2-stage engines, like the Rolls Merlin 60 series and up, and the Rolls Griffon 60 series and higher, had the 2 supercharger iimpellers on the same shaft. This is simpler mechanically, and both impellers turn at...

More likely, it was when Helicopters came along. - admittedly aboutthe same time. A jet airplane, after all, is still an airplane. A Helicopter is an Optical Illusiom with Sound Effects. -- Pete Stickney

Well, let's see - 2 row wngine, so the R1820's out. No rocker boxes on the heads, so sleeve valves. So - not American. Exhaust leads forward to a collector ring that's the cowl nose - Bristol Hercules. Top of nacelle even with leading edge of wing - My bet;s that it's a Lancaster Mk II. --...

Pappy, Yes, that's precisely it - Brit 100 Octane and US 100/130 are completely interchangable. A note about the rating numbers. The forst (smaller) number is the anti-knock rating for lean mixture - more efficient burning, used for cruise and such.. The second number is the antiknock rating...

There may be a bit of misunderstanding, here. While PN does represent "Performance NUmber", the performance being referenced isn't overall engine performance, but the knock resistance of the fuel relative to a gasoline made up of 100% iso-octane. Basically. it's a measure of the resistance of...