Originally posted by Widewing
I'm afraid you both have it wrong.
In some respects the M4A3E2 Jumbo was better armored than the King Tiger.
This tank was engineered as an "assault tank" and carried very thick armor. Its specially designed turret was better protected than the that of the King Tiger. 180mm on the front, 150mm on the sides and rear. Compare that to 180mm on the front and 80mm on the side and rear of the Tiger's turret.
Let's look at the hulls...
Jumbo Sherman: 100mm on the upper front, 140mm on the lower front.
King Tiger: 150mm on the upper front, 100mm on the lower front.
On the sides of the hull (above the suspension), the King Tiger had 80mm and the Jumbo had 76mm.
Only in the rear did the Tiger II have significantly better protection at 80mm vs 38mm for the Jumbo. The Tiger II was also better protected on the lower sides, behind the suspension.
So yes, the Sherman Jumbo was better protected than the Tiger I, and virtually on par with the Tiger II accepting better turret armor and inferior rear armor. Most Jumbos had the front armor sandbagged, giving it the equivalent of another 25mm of armor. About half of the Jumbos were field modified, installing the M1A2 76mm gun with HVAP ammo. That gun and armor combination meant that this Sherman was quite able to slug it out with a Panther toe to toe with a reasonable expectation of winning.
All of that taken into account, only 254 Jumbos were built and delivered. Another factor not to be ignored was the fact that the Jumbo weighed 42 tons, about 25% heavier than the standard M4A3, and was much slower and less maneuverable.
My regards,
Widewing
WW
I see it as this. The Jumbo's armour was rolled and cast steel in the following amounts:
Hull (rolled sides only)
100mm on the front upper slope 47deg slope
140 to 114mm front lower slope 0 to 56deg slope
76mm upper sides 0 slope
38mm lower sides 0 slope
38mm rear 10 to 22deg slope
Turret (all cast)
178mm Mantlet 0deg slope
150mm front 12 deg slope
150mm sides 6 deg slope
150mm rear 2 deg slope
Both versions of the Tiger had forged and rolled face hardened steel. A much better set up for armour plating. In some respects it is considered 75% better than cast armour. Both Tigers had the following for armour.
Tiger I
Hull (rolled face hardened)
100mm front 9deg - 25deg slope
80mm sides 0 deg slope
80mm rear 0 deg slope
Turret
120mm mantlet 0deg slope
100mm frnot 10deg slope
80mm sides and rear 0deg slope
Tiger II
Hull (rolled face hardened steel)
150mm upper front 50deg slope
100mm lower front 50deg slope
100mm sides 25deg slope
80mm rear 30deg slope
Turret
150mm mantlet 13 to 45deg slope
180mm front 10deg slope (changed after 51st turret)
80mm sides 21deg slope
80mm rear 20deg slope
The beauty of the set up on the Tiger II vs. both the jumbo and the Tiger I is that the mantlet was not the only cover on the front. The Tiger II's also had a frontal armour plate behind the mantlet which effectively raised the frontal turret armour to 330mm thick. In a hulldown position, the Tiger II is much better all around in it's armour protection frontally and on quartering shots.
It is my opinion that the Tiger II is extremely better armoured than the jumbo, owing to thicknesses, angles of armour and the fact that the armour is a better quality than the jumbo's. As for the Tiger I, I still feel that while less thick, the armour is better quality and has a better ability to withstand any punishment than that of the jumbo.