Hellcat II JV.224
Aircraft and Armament Experimental Establishment,
Period of tests- September - October 1944
The following information comes from a report provided by Mr. Neil Stirling
This Report deals with the effect of the introduction of water injection on
climb performance in Auxiliary Low gear and on level speed performance
in Auxiliary High gear.
Climb: The rate of climb is increased by 650 ft/min at all heights up to
11,200 ft., the full throttle height using water injection.
Level speed: The true level speed is increased by 20 mph (17 knots)
up to 18,600 ft., the full throttle height using water injection. At this height
the true level speed is 377 mph (328 knots) compared with 367 mph
(319 knots) at 21,800 ft., the full throttle height for the maximum manifold
pressure permissible without water injection.
The aircraft was flown at a mean weight of 11,500 lb. (no external stores).
Speeds recorded using water injection and 60"Hg boost:
354 mph./12,000 ft.
361 mph./14,000 ft.
368 mph./16,000 ft.
375 mph./18,000 ft.
377 mph./18,600 ft.
374 mph./20,000 ft.
367 mph./21,800 ft.
366 mph./22,000 ft.
353 mph./24,000 ft.
2,000 ft./3,160 fpm./0.63 min.
4,000 ft./3,160 fpm./1.26 min.
6,000 ft./3,160 fpm./1.89 min.
8,000 ft./3,160 fpm./2.25 min.
10,000 ft./3,160 fpm./3.15 min.
12,000 ft./3,000 fpm./3.80 min.
14,000 ft./2,680 fpm./4.51 min.
15,000 ft./2,490 fpm./4.91 min.
Converting altitudes to meters within the scope of these tests looks like this:
Altitude / Speed / Climb
Meters / mph / minutes to altitude
S. L. 3160
1,000 3160 1.04
2,000 3160 2.08
3,000 3160 3.12
3,415 3160 (critical height for climb)
4,000 358 2820
5,700 377 (full throttle height for speed, still at 60"Hg)
6,000 373 (56.9"Hg)
7,000 361 (49.9"Hg)
This aircraft and these tests are mentioned in Peter Caygill's book
Flying to the Limit. The following are quotes from this book, page 187.
"Although the service ceiling was quoted as being 37,800 ft., the
Hellcat struggled much above 30,000 ft."
"The stalling speed with gear and flaps down was a very low 67 mph. IAS."
Edited by CORSNING, 13 November 2017 - 06:08 PM.