Climb from fifteen thousand (15,000) feet indicated to twenty thousand (20,000) feet indicated the Zero took immediate advantage and walked away from P-39D-1. At twenty thousand (20,000) feet indicated at a cruising speed of two hundred (200) miles per hour indicated, and from a starting signal for acceleration, the Zero momentarily accelerated away from P-39D-1. It took P-39D-1 thirty (30) seconds to catch up and go by Zero.
Climb from twenty thousand (20,000) feet to twenty-five thousand (25,00) feet was not completed as P-39D-1 was running low on gasoline.
Climb from sea level to twenty-five thousand (25,000) feet indicated. Take-off was accomplished in formation on signal, P-39D-1 left the ground with 3000 RPM and 55 inches manifold pressure. P-39D-1 maintained advantage of climb from take-off to fourteen thousand eight hundred (14,800) feet indicated. Above this altitude P-39D-1 was left behind reaching twenty-five thousand (25,000) feet indicated approximately five (5) minutes behind Zero. At twenty-five thousand (25,000) feet indicated from a cruising speed of one hundred eighty (180) miles per hour indicated Zero accelerated away from P-39D-1 for three (3) ship lengths. This lead was maintained by the Zero for three (3) ship lengths. This lead was maintained by the Zero for one (1) minute and thirty (30) seconds and it took the P-39D-1 thirty (30) more seconds to gain a lead of one (1) ship length.
10. ZERO vs P-40F:
Tests were not completed with the P-40F because it was found impossible to obtain maximum engine operation.
11. ZERO vs P-51:
Climb from sea level to five thousand (5,000) feet indicated. Take-off was accomplished in formation on signal. P-51 was drawing 3000 RPM and forty-three (43) inches manifold pressure. This low manifold pressure was due to the setting on the automatic manifold pressure regulator. The Zero reached its best climbing speed before the P-51 left the ground. The Zero left the ground approximately six (6) seconds before the P-51. The Zero reached five thousand (5,000) feet indicated approximately six (6) seconds before the P-51. At five thousand (5,000) feet indicated from a cruising speed of two hundred fifty (250) miles per hour indicated, P-51 accelerated sharply away from Zero.
Climb from five thousand (5,000) to ten thousand (10,000) and from ten thousand (10,000) to fifteen thousand (15,000) feet produced the same results as Zero walked away from P-51 in rate of climb. At ten thousand (10,000) feet indicated from a cruising speed of two hundred fifty (250) miles per hour indicated the P-51 accelerated sharply away from Zero. At fifteen thousand (15,000)
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