Bf 109 G-10 vs K-4

[tomo pauk]

Interesting your comment about the variable speed drive. But , the americans did introduce a similar system on the F4U5. Why would introduce it if it was inferior than the 3 speed supercharger?

They also went with variable speed drive to the R-2800-30, the E series engine for the F8F-2. Hopefully someone will chime in with details about the reasons for the variable speed drive for those.

I believe you have an entire thread about the swirl throttle. Could you send me a link?
I believe that leading edge radiators was out of the question, mainly for production reasons. The annular radiator certainly would require some CoG measures,but i believe it was possible through relocation of equipment in the rear fuselage Even better would be the removal of the the Mg 131s and their heavy synchronization gear from the nose of the aircraft and replace them with wing belt fed MGFF/M . The japanese did introduce belt fed mechanisms for their type 99 cannons and i believe german experimented too.

Link.
I very much agree about deleting the cowl MGs and installing the MG FFM in the wings on the Bf 109s, starting already with 109F. Oerlikon was offering the British with belt-fed variants of their cannons in early 1930s, so it can be done. Indeed the Japanese did it and Germans experimented with that. Event the 90-rd drum would've been good until belt feed is introduced.
Reason why I've suggested the leading edge radiators is that they can decrese the drag, eg. NACA suggested that for the YP-38.