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Sakae 12 U.S. Navy. Via Francillon (1979). |
Sakae 21
U.S. Navy. Via Francillon
(1979). |
| Ha-115
U.S. Navy. Via Francillon (1979). |
The Nakajima
Sakae ("Prosperity") was an air-cooled 14-cylinder double-row
radial engine with a single-speed supercharger and a bore of 130mm
and stroke of 150mm. It was derived from the Gnome-Rhone engine
produced under license in the 1930s, and resembled a scaled-down Ha-5. It could run
reliably on a very lean fuel
mixture on extended flights, which helped give the A6M "Zero" its impressive
range. Kawasaki also
produced the engine under license for the Army as the Ha-25 or
Ha-115.
| Model |
Horsepower |
Wattage |
Notes |
|---|---|---|---|
| 11 |
1000 hp (takeoff) 970 hp (9800 feet) |
746 kW (takeoff) 723 kW (3000m) |
Also known
as the NK1B or [Ha-35] 11 |
| 12 |
940 hp
(takeoff) 950 hp (13,800 feet) |
701 kW
(takeoff) 708 kW (4200m) |
Also known
as the NK1C or [Ha-35] 12 |
| 21 |
1130 hp (takeoff) 1100 hp (9350 feet) 980 hp (19,700 feet) |
834 kW (takeoff) 820 kW (2850m) 731 kW (6000m) |
Also known as the NK1F or [Ha-35] 21. The Sakae 22 was a mirror image developed for the J1N "Irving". |
| Army Type 99 Ha-25 |
980 hp (takeoff) 970 hp (11,155 feet) |
731 kW (takeoff) 723 kW (3400m) |
|
| Army Type 1 Ha-115 |
1150 hp (takeoff) 1150 hp (8040 feet) 980 hp (18,375 feet) |
857 kW (takeoff) 857 kW (2450m 731 kW (5600m) |
Also known as the [Ha-35] 25. Added a two-stage supercharger. |
| Army Type 1 Ha-115-II |
1190 hp (takeoff) 1230 hp (9,185 feet) 950 hp (22,310 feet) |
887 kW (takeoff) 917 kW (2800m) 708 kW (6800m) |
Also known
as the [Ha-35] 24 or Sakae 24. Tuned for high altitude
performance. |
The Sakae powered the A6M "Zero", A6M2-N "Rufe", C5M "Babs", J1N "Irving", B5N2 "Kate", Ki-43 "Oscar", Ki-45 "Nick", Ki-48 "Lily", and Ki-56 "Thalia."
American experts who examined Sakae and Kinsei engines in aircraft wreckage at Pearl Harbor described them as "like a Swiss watch", comparing their workmanship favorably with Allied aircraft engines.
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References
Goodwin and
Starkings (2017)
Gunston (2006)
Peattie (2001)
The Pacific War Online Encyclopedia © 2006-2007, 2009, 2014, 2019 by Kent G. Budge. Index
