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 03-02-2002, 20:30 Post: 36013
DRankin



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  Diesel efficiency and Aircraft Engines in WWII

Indeed, WW II Gasoline aircraft engines were supercharged and in some cases used compound superchargers. Some, the F4U comes to mind, also used a water injection system as an emergency power boost to escape pursuing aircraft.






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 03-04-2002, 08:40 Post: 36052
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  Diesel efficiency and Aircraft Engines in WWII

Peters, the water injection I spoke of on the F4U was not for cooling but was injected into the cylinders as an emergency power boost. Several times it saved pilot caught on the deck with 'zekes' on their tail. By all accounts the engines were trashed after this was used. I wiil have to look in my corsair pilots handbook, but I remember the engine as a two row radial with 18 cylinders and 2100 horses. The charger I think was a single stage. I remember the two stage units on B-29's and maybe the F8F and certainly it was used on post war airliners like the DC6.






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 03-05-2002, 08:59 Post: 36104
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  Diesel efficiency and Aircraft Engines in WWII

Tom, people need supplemental o2 above 12,000 feet and so do air breathing engines. It is a safe bet that any piston driven aircraft with an operational envelope or a service ceiling over 14 or 15 thousand feet has some sort of manifold boost. Another clue is whether or not the aircraft produces a contrail. In the case of the early WW II bombers (B17,B24,25&26)all had non-pressuized hulls and operated in excess of 25,000 feet. Thats why they had to wrap those boys in sheepskin and why they were always wearing o2 masks. In fact the B-17 had large open windows on the side out of which the waist gunners operated. There was no provision to close these openings. The B-29 was pressurized and I believe it drew its cabin pressure from the supercharger output of a selected engine. If that engine lost power they had to resort to o2 or fly below 12,000 feet.






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