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Old 11-16-2010, 09:07 PM   #31 (permalink)
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That's a very impressive effort by Julian.

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Old 11-16-2010, 10:06 PM   #32 (permalink)
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Quote:
Originally Posted by Old Tele man View Post
...how many TURBO-charged WWII fighter aircraft were there compared to SUPER-charged WWII fighter aircraft? Uh, none!
Uh, one comes to mind. The P-38 Lightning was turbocharged.
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The presence of traffic is the single most complicating factor of hypermiling. I know what I'm going to do, it's contending with whatever the hell all these other people are going to do that makes things hard.
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Old 11-16-2010, 10:18 PM   #33 (permalink)
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Quote:
Originally Posted by Mustang Dave View Post
Uh, one comes to mind. The P-38 Lightning was turbocharged.
Yep, Pop was going to ferry one from England to Paris and had a turbo fire and aborted.

Forgot that one, but I believe most of the radial engine planes were turbo charged.

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Old 11-17-2010, 12:35 AM   #34 (permalink)
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...after WWII, both (SC & TC) were used together, one example being the turbocompound Curtis-Wright R3350-42 engines, which had a single-stage, two-speed, supercharger and three 'Power Recovery Turbines" (PRTs). The PRTs extracted 500 HP from the exhaust gases from the 18 cylinders and put it back into the engine crankshaft, boosting total output power from 2,900 HP up to 3,400 HP per engine...plus delivering lowest fuel consumption per HP at lean cruise, only about 100 gallons/hr per engine.
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Old 11-17-2010, 07:34 AM   #35 (permalink)
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IIRC, it wasn't long before they realized they didn't need the ICE in the middle.
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Old 11-17-2010, 12:27 PM   #36 (permalink)
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Quote:
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IIRC, it wasn't long before they realized they didn't need the ICE in the middle.
...LOL, "true" ie: SC-ICE-TC.

...however, just about any ICE aircraft engine gets BETTER fuel economy (but not SPEED) than any equivalent JET engine.

...example: with only 8,760 gallons of 115/145 AVGAS, we (Lockheed EC-121) could stay airborne for 18-20 hours...and still have reserve! Try that in a jet--NOT (ha,ha)!

...that's what "patrol" planes need--endurance, not speed--ie: "time (loiter) on station" to the maximum extent possible.

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Old 11-17-2010, 09:29 PM   #37 (permalink)
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Quote:
Originally Posted by Old Tele man View Post
...after WWII, both (SC & TC) were used together, one example being the turbocompound Curtis-Wright R3350-42 engines, which had a single-stage, two-speed, supercharger and three 'Power Recovery Turbines" (PRTs). The PRTs extracted 500 HP from the exhaust gases from the 18 cylinders and put it back into the engine crankshaft, boosting total output power from 2,900 HP up to 3,400 HP per engine...plus delivering lowest fuel consumption per HP at lean cruise, only about 100 gallons/hr per engine.
Essentially a turbocharger coupled to the crankshaft (other than the 2-speed compressor part).
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Old 11-18-2010, 12:00 PM   #38 (permalink)
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Essentially a turbocharger coupled to the crankshaft (other than the 2-speed compressor part).
...exactly. I still have my copy of the NATOPS manual for the EC-121, and there's a nice picture illustrating how the PRT's worked.

..the coupling between the turbine and the crankshaft wasn't "hard," there was a "fluid coupling" (torque converter) in between each PRT and the crankshaft.
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Old 11-18-2010, 10:50 PM   #39 (permalink)
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This past June 26, I went for a tour of a C-121 Constellation. This particular aircraft was Douglas MacArthur's personal transportation during the Korean War. It's airframe and engines are in flyable condition. It resides at the "Planes of Fame" air museum at the Valle airport between Williams and the Grand Canyon.
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Old 11-19-2010, 04:29 PM   #40 (permalink)
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...to meander back to the original posting, "yes," both Super Charging (SC) and Turbo Charging (TC) can and do increase fuel economy, but the combination of BOTH can do even better job (hence, my R3350-42 example above).

...SC both MAKES usable power and TAKES usable power, while TC MAKES usable power from the "waste" exhaust heat and gas flow, hence the "title" Power Recovery Turbine (PRT) on the R3350-42 engines.

...both SC and TC have their own pros & cons.

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