
Originally Posted by
Torashuu

Originally Posted by
Th3GoodSon
You're silly. Look at the stats. Guns are not about diameter, they're about muzzle velocity. The British QF 17pdr could penetrate approximately 131mm or 30 degree sloped armour at 1000m (go Wiki!) and the 76mm M1 on the Easy Eight could manage 92mm at 1000m of UNSLOPED armour. Not only that, but the 17pdr round also had more mass (was heavier) so can deal more damage on impact both through the velocity and the mass (physics win!)
So yes. The Firefly ought to have some pretty hard core accuracy and penetration/damage. It ought to be comparable to a decent Tier 8 gun but on a Tier 5 tank chassis, so maybe a Tier 6 premium?
TL;DR: IT'S NOT THE DIAMETER, STUPID, IT'S THE VELOCITY
I get the physics part just <didn't do the research>. Figured the brits slapped that cannon of theirs on sherman and murcans went "Huh, what a good idea" and whiped up some E8's. With their gun obsession you'd figure they wouldn't be using an inferior cannon. Oh well. I am assuming the brits installed a boiling vessel in their shermans as well?
TL;DR assumed 17pdr and 76mm M1A1/2 are same gun, am wrong.
It's kind of a funny story.
Brits wanted a better AT gun on their Shermans, but the US wouldn't retool their factories to develop a better gun. They felt that the gun was a good compromise between infantry-support and AT duties. Besides, the US still ran with the Tank Destroyer doctine where they had normal tanks for infantry support and Tank Destroyers (ie Slugger, Hellcat, etc) for AT duties. And if it came down to it, the US would rather produce more Shermans than having to retool factories and rearming their tanks with a whole new kind of ammo (supply chain was very long, and take transportation into consideration from US to Europe) and skill-set. This is also discounting that the Sherman's had good HE ammo which the 17pdr gun lacked (remember, it was originally a towed AT gun).
So the British wanted to place a gun that they knew was proven to defeat German armor into their Shermans but couldn't figure out how. IIRC, this problem persisted with people trying to even develop plans for a different turret to house the 17pdr gun, but were limited by the turret ring size and war materials for the development. That is until someone figured that instead of trying to modify the gun's recoil, they would just redesign it to the task at hand. Then they turned the gun on it's side for easier loading. And thus the Firefly was born.
But since it took effort and time to convert Shermans to the Firefly, the British continued to use the normal 75 and 76mm Shermans in addition to their Fireflys. The # of Shermans greatly outnumbered the Fireflys that it was issued as 1 Firefly per troop. And because Fireflys had a much longer and distinct barrel than other Shermans, they became known to German units and were given priority to be taken out over other tank types.
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