You are probably right, but how do we measure it? What would make the B17 tougher than an He111?
It is approximately 1/3 bigger than a Heinkel and 1/3 heavier. Would that make it 1/3 harder to damage or destroy?
It's a bigger target, hence higher hit probability, does that offset heavier construction in a larger aircraft?
While 8 x .303 is probably not as effective as mulitple .50 mgs or 20mm cannons, it is not "ineffective". Didn't some FW200s succumb to .303 fire from Hurricanes?
edit: After a bit of research the first FW200 to be shot down was by a catapault launched Hurricane 1A from the CAM ship Maplin.
Hi Claide
sorry, I missed your post
agree with the posts in response to yours
I think in the case of the B-17, size does count for something vs a Heinkel. The Warren truss construction could absorb considerable battle damage and demonstrated a significant advantage over the Davis wing of the B-24 in terms of battle damage absorption; translating size as volume, you have to knock out an awful lot of the B-17's wing to get it to fall.
You also have double the powerplant redundancy over the Heinkel coupled with the fact that they're radials vs the Heinkel's inlines.
I would say that whilst 8 x .303s are not ineffective, if the RAF had found themselves facing B-17s, the demise of the said battery would have come about much, much sooner. I maintain my point that it would take an awful lot of .303 to make a B-17 hurt, I would argue likely more than one fighter. Of course, you could get lucky and kill the guys in the office but that applies to any bomber.
The Fw200 was not, if I recall, the most robust of 4-engined aircraft, having been a design for civilian application that was pressed into military service. I don't know too much about the type other than that; armour, fuel cells, defensive armament but the BMW801s would be up to it.