Вот про Хелкет.
Цитата:
Grumman Aircraft Engineering Corporation
May 1, 1944
Report No. 2422B
Detail Specification
For
Model F6F-3 Airplane
SUMMARY
Fighter
(Normal) Fighter
(Overload)
Fuel (gals.) 182 250
Gross Weight (lbs.) 11506 12415
High Speed at sea level (MPH) 312 309
High Speed at 5500 ft. (MPH) 330 327
High Speed at 10500 ft. (MPH) 343 340
High Speed at 15000 ft. (MPH) 357 354
High Speed at 16100 ft. (MPH) 355 352
High Speed at max. engine rated alt. 21500 ft. (MPH) 373 370
High Speed at airplane critical alt. 23500 ft. (MPH) 379 376
High Speed at airplane critical alt. 25000 ft.
at 1650 HP military rating (MPH)* 391 388
Stalling speed at sea level with full
load and without power (MPH) 78.4 81.1
Stalling speed at sea level with full load
less fuel without power (MPH) 74.6 75.9
Stalling speed at sea level less 1/2 fuel
without power (MPH) 76.6 78.6
Initial rate of climb at sea level (ft./min) 3650 3600
Time to climb to 10,000 ft. (min.)* 3.1 3.2
Time to climb to 20,000 ft. (min.)* 7.0 7.2
Service ceiling (ft.) 35500 34400
Endurance at high speed (hr.) at 12000 ft. alt. .84 1.15
Maximum endurance (hr.) at 12000 ft. alt. 6.04 8.03
Maximum range (mi.) at 12000 ft. at. 1100 1500
Average speed for maximum range (MPH) at 12000 ft. alt. 200 200
Average speed for maximum end (MPH) at 12000 ft. alt. 152 152
Take-off distance in calm (ft.)* 549 628
Take-off distance in 15-knot wind (ft.)* 351 402
Take-off distance in 25-knot wind (ft.)* 242 277
* Military Power
Time to climb uses military power for five minutes.
For the more of this report see HERE
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А у меня уже получаеться 506/620 км. в час - у земли/высота 6000 метров.