blattymotrs
Recruit
- 3
- Jan 22, 2010
I'd still like to find out much more about this engine, I mean more than is contained in this page, or info on the Ha-50.
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Thanks for presenting this Wright 22-cylinder engine. I did not know any other 22-cylinder engine projects except Mitsubishi Ha-50 before....I was quite surprized to see this high quality rear oblique of the illusive R-4090.
I'd still like to find out much more about this engine, I mean more than is contained in this page, or info on the Ha-50.
Wright had a LOT of trouble getting the rear cylinders of the 18 cylinder R-3350 to stay cool. With 11 cylinders in each row, and even less space for air to get to the rear bank of cylinders, I would start the betting that cylinder head temperature on the rear row of the 22 cylinder R-4090 would have been a nightmare.
Piper106
Don't forget that diameter of engine is bigger then of R-3350, so spaces between cylinders could stay unchanged.
By the way, does anybody know any projects of 3-raw radials? I never found such designs but it seems that arrangement of 3 7-cylinder raws that gives 21 cylinders is even better then 18-cylinder 2-raw design. And its well known that 4-raw Pratt Whitney R-4360 radials were successful and wide application.
Oh, yeah...the Lycoming R-7755!
-7,755ci
-~5,000BHP
-0.64 hp/in³
-0.82 hp/lb
-10' x 5', over 6,000lbs
-36 cylinders, 4 rows, 9 cylinders per row, not rotated (9 straight banks, not "corncobbed" like the R-4360)
-Liquid cooled, turbosupercharged
-SOHC with 2 separate cams, selectable by the pilot, for economy cruise, and full takeoff power (variable valve timing!)
-XR-7755-2 had twin-output gear reduction box for contra-rotating props
-The reduction box itself had two speeds, since the was to much power to utilize by adjusting the props alone.
-Damn big azz engine.
It was delivered to the USAF, who (according to Wikipedia) told them to "dump it on the ground". It disappeared, only the single test engine was saved.
Nice, ey? Although you should check out the Russian "Zvezda M503": 7 x 6-row 42-cylinder diesel marine radial! Liquid cooled, 8,763ci. Not much of an aircraft engine (4,000BHP + 12,000lbs = 0.32 hp/lb! (vs the R-7755 @ 0.82hp/lb)