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Short of some ultra obscure V-12 aereo engine of that size, yes it was the worst.Was there any V-12 aero engine larger than 35L that wasn't better than the Hispano-Suiza 12Y? These could include the likes of the:
Rolls-Royce Merlin
Rolls-Royce Griffon
Packard V-1650 (licensed Merlin)
Allison V-1710
Junkers Jumo 211
Junkers Jumo 213
Daimler-Benz DB 601
Daimler-Benz DB 605
Kawasaki Ha-40 (licensed DB 601)
Fiat RA.1050 (licensed DB 605)
Klimov M-103 (based on the HS 12Y)
Klimov M-105
Klimov VK-107
I've changed it to equal or greater than (≥) 35 L. I believe that covers them all.Some of the engines you mention are not bigger than 35 L though.
Was there any V-12 aero engine of 35L or greater displacement that wasn't better than the Hispano-Suiza 12Y? These could include the likes of the:
Rolls-Royce Merlin
Rolls-Royce Griffon
Packard V-1650 (licensed Merlin)
Allison V-1710
Junkers Jumo 211
Junkers Jumo 213
Daimler-Benz DB 601
Daimler-Benz DB 605
Kawasaki Ha-40 (licensed DB 601)
Fiat RA.1050 (licensed DB 605)
Klimov M-103 (based on the HS 12Y)
Klimov M-105
Klimov VK-107
It's subjective for certain, but here's a good test. If we replaced any of the above engines with a 12Y, would the aircraft have better performance? To be fair we need to remember that the 12Y is an early war engine, so a direct comparison with the likes of the RR Griffon (first run in 1939) are unfair. But swap out the DB 601 from the Bf 109E, or the Merlin from a Spitfire Mk. II for a 12Y and I think we're in the negative.I am not certain that "better" is an accurate measure to assess the 12Y.
Yeah. My understanding is that it was quite useful in the 1930s because very few/no Vee engines existed in this size and power category, and to boot it could offer a 20mm autocannon at a time when fighter armament was rather light. It is really in the late 30s/WW2 that it lagged behind because considerably newer engines appeared in numbers.The 12Y is a 1932 engine in early form, with major types produced by 1934. This predates virtually all your candidates.
The Spitfire II is listed with the Merlin XII is listed as a 1939 development. So, as I suggest, maybe your criteria should be defined?
Eng
No.It's subjective for certain, but here's a good test. If we replaced any of the above engines with a 12Y, would the aircraft have better performance?
Well said. However I have read about issues with the Kawasaki Ha-40.No.
NO.
NO.
Speaking of RR, I would have liked to have seen the Dewoitine D.520 (D.521) and especially the Arsenal VG-33 (VG-40) with a RR Merlin for comparison.Basically the 12Y was about the same as RR keeping the Buzzard engine of 1928 and improving it the least amount possible until 1940 and still being able to sell it and then wonder why everyone else had passed them by.
Rolls-Royce Merlin
Packard V-1650 (licensed Merlin)
Allison V-1710
Daimler-Benz DB 601
Rolls-Royce Griffon
Junkers Jumo 211
Junkers Jumo 213
Daimler-Benz DB 605
Fiat RA.1050 (licensed DB 605)
Klimov M-103 (based on the HS 12Y)
Klimov M-105
Klimov VK-107
Silly me, I meant 25 L. I'll amend the thread. I was just trying to keep out the smaller V-12s like the 18L de Havilland Gipsy Twelve, 19L Curtiss D-12 and 21L Rolls-Royce Peregrine. I consider these smaller engines as useful but in another category.FYI, the following were not equal to, or greater than, 35L capacity
Just for curiosity, is there a reason to have Rolls Royce and Packard Merlins as separate items?Was there any V-12 aero engine of 35L or greater displacement that wasn't better than the Hispano-Suiza 12Y? These could include the likes of the:
Rolls-Royce Merlin
Rolls-Royce Griffon
Packard V-1650 (licensed Merlin)
Allison V-1710
Junkers Jumo 211
Junkers Jumo 213
Daimler-Benz DB 601
Daimler-Benz DB 605
Kawasaki Ha-40 (licensed DB 601)
Fiat RA.1050 (licensed DB 605)
Klimov M-103 (based on the HS 12Y)
Klimov M-105
Klimov VK-107
They're weren't identical. Same as the Kawasaki Ha-40 (licensed DB 601) and Fiat RA.1050 (licensed DB 605) are not identical to the German engines.Just for curiosity, is there a reason to have Rolls Royce and Packard Merlins as separate items?
In what significant way did they differ?They're weren't identical. Same as the Kawasaki Ha-40 (licensed DB 601) and Fiat RA.1050 (licensed DB 605) are not identical to the German engines.
I'm not sure about the Merlins, but I've read that the Kawasaki Ha-40 was a poor cousin of the DB 601 due to the lack of the specified supercharging system.In what significant way did they differ?