Again the chart with F4F-4 with Cyclone???
It's a chart with Sea Hurricane IB performance curves but again compare the chart with these numbers from Oct 1942:
Detail Specification
For
Model F4F-4 Airplane
SUMMARY
(Normal) Fighter (Bomber) (Overload) Fighter
Fuel (gals.) 110 110 144
Gross weight (lbs.) 7426 7424 7972
High speed at sea level (MPH) 275.0 265.1 274.4
High speed at 2500 ft. (MPH)* 281.8 271.8 281.1
High speed at 4600 ft. (MPH)* 283.1 273.0 282.7
High speed at 12,000 ft. (MPH)* 303.2 293.2 302.4
High speed at 14,000 ft. (MPH)* 304.5 294.3 303.8
High speed at max. engine rated alt. 19,000 ft (MPH) 317.0 307.1 315.0
High speed at airplane critical alt. 19,400 ft. (MPH) 318.0 308.2 316.1
Stalling speed at sea level with
full load and without power (MPH) 78.7 78.5 77.4
Stalling speed at sea level with
full load less fuel (MPH) without power 70.7 70.7 81.3
Stalling speed at sea level less 1/2
fuel (MPH) without power 75.0 74.9 76.8
Initial rate of climb at sea level (ft./min.) 1920 1810 1690
Time to climb to 10000 ft. (min.) 5.7 6.0 6.5
Time to climb to 20000 ft. (min.) 12.7 13.1 14.7
Service ceiling (ft.) 34800 34600 33600
F4F Performance Trials