About the 108s and the 47, I don't know what was wrong with that particular P47 but it took a lot of hits, yeah. And it's not something unusual. I remember chasing a P47 with Brain32 once, both firing a mixture of 108s, 20mm and 13mm rounds... It really took a lot of hits to bring him down...
Less than with 7.92mm though... Once I've made the test online, I had default armament in the nose... I chased an already damaged 47 (I damaged his engine) and wanted to see how effective those MGs are.... I fired half of my ammunition and scored 800 hits... to no visible effect. At the end I had to score again some 12 x 20 mm rounds to bring it down. Otherwise he would've flown straight back to its base. That's why I gave up the default armament. Usually, one 30mm round = 50 - 100 mg rounds. If you aim properly, this is more effective.
To Mikk Owl, I confirm : the safest way to go out of a bad situation is to have a wingman
Manoeuvering is good but then even if you manage to lose an enemy's aim for a few seconds, the 110 poor acceleration makes it hard to take any advantage.
@ Berserk : You have to send me some tracks on how you do that job with the Bk37 against sherman. I never managed anything with that gun.