so even at different temperatures, 0-25C the TAS is 265-277mph at 500ft (if i did that right?)
Quote:
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The A.&A.E.E. trials of N.3171 resulted in level speeds of 283 mph at sea level and 354 mph at 18,900 feet with the Merlin engine operating at 6.25 lbs/sq.in., 3000 rpm. 1d For comparison, Spitfire Mk. I R.6774 equipped with de Haviland Constant Speed Airscrew and armoured windscreen achieved 288 mph at sea level and 355 mph at 17,800 using 6.25 lbs/sq.in., 3000 rpm. The similarly equipped Spitfire I R.6770, except fitted with 2 cannons and four Browning guns, reached 358 mph at 18,000 ft. The Royal Aircraft Establishment (RAE) obtained 314 mph at sea level and 359 mph at a full throttle height of 11,500 feet using +12 lbs/sq.in. boost.
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seems slow to me
