This is intended for people interested in the subject of military guns and their ammunition, with emphasis on automatic weapons.
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Hawker Hurricane is rather unavoidable. It could never match Spitfire in power to weight ratio, but it could be made faster, without much risk.
That could be done keeping fuselage as it was and replacing wings with thinner ones. Opportunity for that would be wings replacement that Hurricane underwent anyway.
Just have Don suggest designing one more set of wings, as thin as possible.
I can't tell how much faster such modified Hurricane would be. I can only say, that real one did 307 mph at 15 kft ( http://www.wwiiaircraftperformance.org/hurricane/l2026.html ) with about 1000 bhp from Merlin III.
P-40B - with slightly less wing area - at the same height did 331,5 mph with 920 bhp and 352 mph with 1090 bph ( http://www.wwiiaircraftperformance.org/P-40/P-40B_41-5205_PHQ-M-19-1227-A.pdf ).
Hurricane with new wings would be much more competitive than the real one in terms of speed and a bit in climb (drag influences that too), not falling behind Spitfire in ability to make tight turns.
Also Hawker could skip thick-winged Typhoon stage, whatever they would be designing in the FW world.
I am in favour of fall-back positions with everything, especially if the preferred option is something new (and therefore riskier). So, I have no problem with proceeding with the Centaurus and Griffon as they provide more options.
I think that the Hurricane as used in the BoB should be left alone, except for solving that fuel-tank vulnerability which cost so many lives, and adding Oerlikon guns. However, the intended replacement for the Hurricane ("Beaufighter") as a carrier plane and fighter-bomber is untried, so a fall-back would be to design new wings which are thinner, as suggested, and also designed to fold for carrier stowage. Two problems solved in one go!
If necessary, the Typhoon could be developed in a a similar, thin-folding-wing form with Centaurus or Griffon.