Recip question
Since everyone on this thread is testing everyone else on their collective aviation knowledge I thought I would add my own two cents (Canadian).
What is the largest radial recip ever designed for use in an aircraft? They constructed several but the design never entered production. :cool: |
I think it was some marvel of British complexity, A post war W 24 cyl monster, made by Bristol ?
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Lycoming or Continental - I forget which - came out with a 36 cylinder - 5000+ cu in monster back in the early fifties. I think it made it as far as the test bed. I've got a bit of info on it around here somewhere, in a book that Pratt and Whitney published on their 25th anniversary. Gotta see if I can find it.
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Hmmm, 'twas Lycoming I think, but can't remember the displacement.
The Hiller museum in San Carlos California has a very nice cut-away rotating display of the P&W R4360...LOTS of moving parts. From the guys that flew the Stratocruiser...used "nearly" as much oil as fuel...:rolleyes: :rolleyes: |
I suspect that it was the Lycoming XR-7755-3.
This 5,000 hp engine was intended to power the Convair B-36. NASM |
5000 hp ? Pah, a mere stripling. :p
R-4360-20 7000hp, 7800 with injection. |
Double the horsepower with injection? Using what, NOx ?
To: Paper Tiger
5000 hp ? Pah, a mere stripling. 4360-20 7000 HP, 7200 with injection R-4360-4A: 3,000 hp (2236 kW) R-4360-4W: 3,000 hp (2236 kW) R-4360-35: 3,500 hp (2610 kW) R-4360-41: 3,500 hp (2610 kW) R-4360-59B: 3,500 hp (2610 kW) R-4360-63A: 3,800 hp (2834 kW) I know that injection increases horsepower by increasing the volumetric efficiency of the engine but doubling the designed horsepower is a bit of a stretch. However I have been wrong before. Although it was stated above that the XR-7755 was built to power the B-36 it was my understanding that it was built for a single seat fighter that resembled a P-47 on steroids. The engine was mounted behind the pilot much like the Aircobra. The aircraft was to be built in the Fisher Body Bomber plant in Cleveland, Ohio. On one test flight (before the cancellation of the program) the aircraft augured in and pushed the pilot or what remained of the pilot 30 some feet into the ground. :cool: |
Oh dear :o On this C-119 page it says
The C-119 had two R-4360-20 Pratt & Whitney engines. Each engine had 28 cylinders in four rows and seven banks, 56 spark plugs, 7 Magnetos, 4 seperate circular rotating cams, and an internal super-charger. At take off settings, together they developed 7000 HP (7800 water injected) delivered to, two Hamilton Standard, four paddle blade, 14 foot props. The Pratt & Whitney R-4360-20 was the most powerful internal combustion reciprocating engine ever built. Unusual way of quoting hp, but no excuse :rolleyes: The dash 20 appears to be the military equivalent of the -CB2. http://www.geocities.com/pentagon/qu...0/engine9.html I shall spend the next 30 minutes in the penalty box. |
PaperTiger is quite correct when he quotes the R-4360-20 being installed in the C-119.
Also fitted were -20WA's in the C-119C. For Lu, there is a PDF file in the AHES site under P & W and search through R-4360, which lists all the various dash# and applications for R-4360 The Fisher a/c mentioned, the XP-75, utilised the so-called double Allison-V-3420-19 installed a la P39, P-63 behind the pilot and driving the propellor via a long extension shaft. 8 XP-75's ff 30-9-43, plus 5 P-75A's built. The P-47 on steroids was the XP-72 fitted with an R-4360-13, 2 of which were built, ff 2-2-44. Quotations from :United States Military Aircraft since 1909, by Gordon Swanborough & Peter M Bowers. Published by Putnam. New Edition 1989 ISBN 0 85177 816 X To clarify the Lycoming XR-7755-3. This is a size in cubic inches, and not a horse power figure. Excellent references to be found at : AHES Regards, HectorusRex |
Some more figures re: the Lycoming XR-7755.
This 36 cylinder engine was destined to be the largest reciprocating engine ever built. The displacement was 7,755 cubic inches. When compared to Lycoming's largest production engine in production today which displaces 720 cubic inches, it was more than 10 times larger! This huge engine was 10 feet long, 5 feet in diameter and weighed 6,050 pounds. It produced 5,000 HP at 2,600 RPM, and the target was 7,000. It used 580 GPH of av gas at the 5,000 HP rating. There were nine overhead camshafts which could be shifted axially for METO power in one position and cruise at the other. Two great shafts emerged for coaxial propellers, and there was a two speed gear-change box between the crankshaft and the propeller shafts. Development of the XR-7755 began at Lycoming in Williamsport in the summer of 1943. With the end of World War II in 1945, the military no longer had a need for an engine of this size, and development of the XR-7755 stopped at the prototype stage. During those years, Lycoming put together a team, under the leadership of VP Engineering Clarence Wiegman, to develop this super-size engine. The engine now resides at Silver Hill of the Smithsonian Institute. (Special thanks to the editors of Lycorama newsletter) -------------------------------------------------------------------------------- Lycoming XR-7755 Specifications: Date: 1943 Displacement: 7,755 cu. in. (127 liters) Cylinders: 36 Bore and Stroke:: 6.4 in. (162 mm) x 6.8 in. (171 mm) Weight: 6,050 lbs. (2,744 kg) Performance: Horsepower: 5,000 hp (3,728 kw) at 44 in Hg.MP. RPM: 2,600 Configuration: 4-cycle, 4 row radial, liquid cooled, 2 speed geared dual rotation propeller drive with turbo-supercharger. © The Aviation History On-Line Museum. 2000 All rights reserved. http://www.aviation-history.com/engines/xr-7755.html |
How about the Napier Nomad. The Nomad was one the most advanced turbo compound engines. A liquid cooled opposed diesel engine coupled to an axial flow turbine. Thermal efficiency as high as 42%.
Type: Horizontal opposed compression ignition 2-stroke engine Cylinders: flat 12 arrangement Bore and stroke: 6 x 7.375 in Swept volume: 2502 cu in ( 41.1 litre) Compressions ratio: 3.5:1 Boost pressure: 89 psi Revolution: 2050 crusing HP range: 3030 cruising, 4100 take-off Specific fuel consumption (lb/hp/h): 0.33 Weight, lbs: 3580 Not the heaviest but quite bulky and probably the most efficient aero-engine built to date. Unfortunately it was hideously complex as only a Napier engine could be :D:D There's one in East Fortune Museum if your up that way |
I believe the record holder was some Italian monster that never made it into an airframe. Unfortunately the book with the information is not accessable at the moment but I'll look into it.
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Anyone know what the company spokesman said when it was realised that the jet turbine engine had been invented and these massively complicated piston engines were suddenly obsolete?
I think it was probably "******!":( :D |
Who knows what evil lies in the minds of men? The Shadow do.
To: Shy Torque
Anyone know what the company spokesman said when it was realised that the jet turbine engine had been invented and these massively complicated piston engines were suddenly obsolete? :cool: |
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