Basically a fighter that has the engine behind the pilot so the space in the nose is devoted to the installation of the substantial guns' firepower; engine being connected to the tractor prop by the extension shaft. U/C can be a tricycle, but it is not mandatory. Of a modest size - talk something that is not bigger than a Spitfire, with a better-than-average cooling sytem layout for a lower drag, and a fully retractable and covered U/C. Wing is 15-ish % thick at root, and uses the airfoil that is in vogue at the respective design bureau.
If one feels adventurous, the engine of choice can be a radial, like it was the case with the Piaggio P.119, but also a big liquid-cooled engine in the 2000+ HP class, like the Sabre or the V-3420, however these will require a bigger airframe.
Countries of interest are UK (the future Class S was supposed to be an airborne gun to kill enemy fighters), Japan (so they - both IJA and IJN - can install powerful guns on an 1-engined fighter), USA (again, but this time with the better chance to succeed than the 50-series fighters or the P-75), Germany, Soviet union, indeed Italy etc.
Yes, I'm aware of the Me-509, and the Soviet and Japanese etc. attempts on creating the similar A/C.
Service use starts in 1941/42, or in 1943 at latest, all depending on the country, so the design phase needs to start several years earlier.
If one feels adventurous, the engine of choice can be a radial, like it was the case with the Piaggio P.119, but also a big liquid-cooled engine in the 2000+ HP class, like the Sabre or the V-3420, however these will require a bigger airframe.
Countries of interest are UK (the future Class S was supposed to be an airborne gun to kill enemy fighters), Japan (so they - both IJA and IJN - can install powerful guns on an 1-engined fighter), USA (again, but this time with the better chance to succeed than the 50-series fighters or the P-75), Germany, Soviet union, indeed Italy etc.
Yes, I'm aware of the Me-509, and the Soviet and Japanese etc. attempts on creating the similar A/C.
Service use starts in 1941/42, or in 1943 at latest, all depending on the country, so the design phase needs to start several years earlier.