Re: Hurricane - glide rate
The Mustang has less zero-lift drag, although most of its benefit was due to the flow through the radiator which would no longer help as much, but being heavier requires more lift, and hence more lift-induced drag. A simple taper wing is less efficient (if not a lot) than an elliptically-loaded wing like the Spitfire or Hurricane (with a straight centre section and tapered outer panels which comes close to the loading obtained from an elliptically-shaped wing). It is not obvious to me that the Mustang would have less overall drag, perhaps even the contrary. It will not be able to maintain a high speed without sticking its nose down and losing height, which rather defeats the point.
It seems to me that whichever aircraft you choose will attain its best glide rate from flying at its maximum L/D, which for a Bf109 is around 7. (I remember this from some Breguet Range Equation calculations demonstrating that some of the proposed range performance figures for the He100 were grossly optimistic nonsense.) I suspect (but cannot confirm) that this would be close to its optimum cruise/endurance speed. I don't know what the peak L/D is for these other types, nor how to get to the glide rate from this. Mea culpa.
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