Are there custom warplanes for aces? I had this thought after watching some ww2 dogfighting documentary and after that watching some anime.
The picture below shows a Bf 109 F, which I think must be one of those planes modified for Galland. It shows the Mickey Mouse emblem typical for Galland and it seems to have MG FF cannons in the wings, like the Bf 109 E, whereas other Bf 109 F's had either no wing armament or armament (MG 151/20) in underwing pods.Channel Front
Now, promoted to Oberstleutnant, he continued to lead JG 26 in 1941 against the RAF fighter sweeps across northern Europe. In early 1941 most of the Luftwaffe's fighter units were sent to the Eastern Front, or south to the Mediterranean Theater of Operations (MTO), only leaving JG 26 and Jagdgeschwader 2 (JG 2) as the sole single-engine fighter Geschwader in France. By this time, JG 26 were being re-equipped with the new Bf 109F, normally equipped with a 15 mm (or later a 20 mm) cannon firing through the propeller hub and two cowl-mounted 7.9 mm MG 17. Galland felt the model was grossly under-armed and so tested a series of 109 "specials" – one with a unique armament of an MG 151/20 cannon and two cowl-mounted 13 mm MG 131 machine guns, and another with integral wing-mounted 20 mm MG FF cannons.[63]
There is at least one RAF CO-Ace (maybe Bader?) who kept the 8mg wing in his Spitfire when the rest of the sqn had gone to 2 cannon and 4 mg variant. Also Sailor Malan ignored the official regulations about having guns harmonised out at 650 yards and had his set to converge 200.
As for Galland, I believe he kept a late model E when the rest of his unit converted to Fs, as he thought the F armament was inadequate.
So yes, some ace/COs did have some leeway with their aircraft.