[bongodriver]

At forward CG, the static stability is sufficiently large. At normal and aft CG the static margin is neutral or unstable.

But this applies to 'all' aircraft, it seems pretty odd to criticise the Spitfire for something that is universal, this is exactly the same problem the Mustang has with a full fuselage tank.

to determine how much of a problem this is for the Spitfire a decent weight and balance schedule is needed, from that it can be calculated how much fuel burn is required to put the CoG forward.