Does anyone know the differences between the V15 and production E-3. I assume that 20mm guns, armour plate, self sealing fuel tanks, bullet resistant glass, were not included. Did the Germans install additional equipment to the 109 similar to Spit 1's compared to the Spit prototype, such as different radios, IFF, emergency equipment, bulges to accomodate the 20mm. All these things presumably would have impacted the performance to some degree.
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