Empty weight of the Spitfire Vc Trop was 5048-5065Lb, and 6220-6495Lb fully loaded, depending on the batch and fittings. The P-40F was 6590Lb empty and 8500Lb at normal load. The Hurri IIb Trop, 5675Lb empty, 7080Lb loaded, even with the weight of twelve Browning .303s, could still reach 20,000ft in nine minutes dead. A Spitfire Vc Trop (Merlin 45) could do it in only 7.3 minutes and the clipped Spitfire Vb was usually lighter than a Vc when loaded, so probably a whisker faster still. The P-40F took 11.2 minutes with a virtually identical engine to the Hurricane. The P-40F was simply grossly overweight, hence why it was outclimbed by even the Hurricane IIb.