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+18 psi was for the Mk.50M - the version with cropped impeller. Same for the Mk.45M.It was obsolete by the time 150 PN fuel and 25 PSI boost was available, saying that the Merlin 50 was approved for 18 Psi mid 1943.
The following war-time Merlins were officially cleared for use of 150 grade and +25 lbs boost:
Merlin 24/224/25/225/26/27/66/266/70/71/76/77/100/101/113/114/130/131 and V-1650-7
All are listed in the respective airframe Pilot's Notes, and/or mentioned in Air Ministry/USAAF dispatches, as cleared for use of +25 lbs boost
Read up on the Merlin Seafires like the LFIIC and the LFIIIC.It was a low altitude engine.
It used the turbocharger to be able to work at high altitude.
Superchargers and turbochargers use up power that could be used to drive the propeller.
Hard to say, It pretty much killed an hope of exhaust thrustHow much of engine power was used by the turbocharger on the P-47 (for example)?
I'll wait for my answer<snip>
I suspect you may may already know.I'll wait for my answer
It's like S Shortround6 says. The engine is actively pumping air to turn the turbocharger. This may be more efficient than using torque from the driveshaft, but it takes power to drive a compressor.I'll wait for my answer
45M, 50M and 55M+18 psi was for the Mk.50M - the version with cropped impeller. Same for the Mk.45M.
Standard Mk.50 and Mk.45 were limited to +16 psi.
Hypothetical, how would a P47 go head to head in a one on one dogfight after the merge with a 190A or MkIX LF at low altitude?, the Jug pilot would haul the big girl around only to find the other two already in a firing position
I was hoping that you know the answer to a specific question:It's like S Shortround6 says. The engine is actively pumping air to turn the turbocharger. This may be more efficient than using torque from the driveshaft, but it takes power to drive a compressor.
That is something I haven't ever been able to track down. Main reason being the turbo using waste energy from the exhaustI was hoping that you know the answer to a specific question:
How much of engine power was used by the turbocharger on the P-47 (for example)?
Alas.
The exact figure will be highly speed (i.e throttle) and altitude dependent.That is something I haven't ever been able to track down. Main reason being the turbo using waste energy from the exhaust
to put more air into the engine for more power. The only main concern seems to be how much extra power is be gained rather than
how much was lost to create it.
Like Calum has said there is no fixed answer.I was hoping that you know the answer to a specific question:
How much of engine power was used by the turbocharger on the P-47 (for example)?
Alas.
| Altitude Feet | R.P.M. | Manifold Pressure "Hg. | Turbo R.P.M. | Specific Fuel Cons. lbs/hp/hr | B.H.P. | True Speed m.p.h. |
5,000 | 2700 | 52.0 | 6,800 | .78 | 2000 | 352 | |
15,000 | 2700 | 51.0 | 11,800 | .77 | 2000 | 386 | |
25,000 | 2700 | 51.7 | 16,900 | .78 | 2000 | 420 | |
27,800 | 2700 | 52.0 | 18,250 | - | 2000 | 429 | |
30,000 | 2700 | 47.5 | 18,250 | - | 1845 | 426 |
Actually, we DID make jokes about the Gremans. Seems like it was about 10 - 12 years back. A new member consistently misspelled Germans as Gremans and we took it up, ran with it, and created a partial Greman history line. We were going to complete it, but the subject died just when it was getting interesting.
He left and never came back. We were just having fun, and didn't mean to run him off.
I bet FlyboyJ remembers the Gremans. If not, maybe he was at Reno at the bar after the Gold final ... maybe.
Anyway, no more Gremans. Promise, unless it is brought up by somebody else up yet again. If so, we could run with it again. The Gremans haven't gotten any better over the years. They're still despicable.
Sorry, I have one burning question about Gremans - can you feed them after midnight?I'm Greman and Riish.
Only if they let it all hang out.Sorry, I have one burning question about Gremans - can you feed them after midnight?