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Panzer III specification was for 15 tons.
Panzer IV specification was for 18 tons.
VK3001 test chassis specification was for 32 tons.
VK3601 test chassis specification was for 40 tons.
Part of the problem for the Tiger may have been the production rate of 25 tanks per month. Perhaps the necessary tooling (jigs/fixtures, etc) were never built to enable faster/higher volume production/lower costs?
It would still be an expensive tank but perhaps not so extreme in comparison?
You may be able to build two MK III/IV transmissions for each Tiger transmission. I doubt if you could build 3, maybe 2 1/2? Same for engines, how many 12 liter V-12s for each 23 liter V-12 can you really build?
The Tiger was never intended for general issue but more of a WW I type "Break through" tank. Something that could attack and penetrate a defended area (proof against 75-76mm field guns firing AP from the sides/rear?) allowing the smaller/faster tanks access to the the less protected enemy rear areas. This may have been a faulty doctrine and in many/most cases the Tigers were not used that way. They were too short ranged to be good in a war of movement.
The problem with coming up with hypothetical German tanks that are 10-15-20 tons lighter than the real Tiger is that you loose some of the fighting qualities of the Tiger and may not gain enough other qualities. Tank that started this thread might be more comparable to a T-34/85. Giving up hull volume to make the tank smaller and lighter means giving up ammo storage and working room. T34/85 carried 36 fewer main gun rounds and around 2000 round less MG ammo. You need more tanks to get the same amount of ammunition to the battle area. Somebody will probably quote a number for rounds fired on average before a tank is knocked out but remember, to get the average one tank had to fire a crap load of ammo to average out the tank that got knocked out after firing only one or two rounds.
What was the rate of fire for a Tiger compared to the rate of fire for a T-34/85?
Practical rate of fire for a T-34/85 is sometimes given as 3/4 rounds per minute, what is the rate of fire for a smaller more cramped "Tiger light"?
12 Tigers (if loaded to max, book figure) carried over 1100 rounds of 88mm ammo. you need 18 tanks caring 61 rounds each to equal the ammo load.
The Tiger was NOT the solution to German's tank problems but a Tiger light isn't the answer either unless you can make them in much large quantities. Even 50 a month won't do the job.
Early in the war the Germans surprise attacked the USSR while they were in the middle of transitioning to new equipment, so still have masses of light tanks themselves, most of it without spare parts or fully mobilized troops. 1941 is a massive outlier that skewed the loss ratios for the first two years of war as the Soviets had to rebuild their institutional knowledge, as they were left with little more than a militia by 1942. By 1943 loss rates changed.
Christos military and intelligence corner: Tank strength and losses ? Eastern Front
By 1943 the big cats were available in larger numbers and their presence shows, but so too does the presence of the Soviet cat killers.
The Germans lost their ability to maneuver when on the defensive from 1943-45. They lacked air superiority and enough experienced infantry to really make an elastic defense work, plus also lacked adequate intelligence about Soviet intentions thanks to Maskirovka and huge Soviet combat strength relative to German combat strength. They could overload even an elastic defense with sheer numbers, as Deep Battle Doctrine was designed to do.
My point though is that the Tigers or a version of them were useful, but the Panther was not due to its limited reliability and numbers. I fully agree that the Pz IV or a sloped armor version that replaced the Pz III chassis entirely (along with the Pz II and 38(t)) would have been ideal when backed up by some heavy tank battalions staffed by a more reliable and lighter heavy hitter like the VK3601H weighing in at 45 tons or so instead of the historical 55 tons. The chassis could then be used for longer range big guns for SP AT like the Steuer Emil, but with a larger chassis that could accomodate the heavy gun better: https://en.wikipedia.org/wiki/Sturer_Emil
Even a 105mm high velocity StuG on the VK3601 chassis would be good too (Dicker Max, but with a bigger chassis). 10.5cm K18 auf Panzer Selbstfahrlafette IVa Dickermax
The Pz III/IV chassis was a disaster, so they needed a VK24.02 or 28.01 chassis with sloped armor and bigger layout to do the job.
As a further consideration it is not just a question of fitting a gun to chassis. Some tanks/vehicles had more combat duration than others. Granted some of the Marders used different ammo than the MK IV tank and the Stugs but the performance was about the same.
However:
Vehicle..........7.5cm ammo.............MG ammo
Marder H............38........................600
Marder M............27........................600
Hetzer...............41........................600
Stug IIIF............44........................600
Stug IIIG ...........54?.......................600
Stug IV.............63?.......................600
Stug IV Neuer....79.........................600
MK IV G............87........................3000
How long can some of those vehicle stay in combat before having to pull out to reload?
How many more vehicles do you need to equal the SAME combat power of the MK IV tank?
Price or man hours per vehicle carrying the same gun does not tell the whole story. The lack of a co-ax gun on the vast majority of non turret vehicles means that they have trouble performing some of the infantry support role/s the tanks could do.
Germans had a problem in that the MK IV was one of the first tanks to carry a 75mm gun in a rotating turret and while it was more upgradeable than some tanks of it's generation it was getting a bit long in the tooth in 1944. Still useful but pretty much maxed out. Try putting it up against T-34/85s and see what happens, no Panthers to share the load. Or M4s with 76mm guns. The US fell down getting the M-26 into service(both in timing and engine). It was late more due to doctrine/production decisions rather than technical problems. British should have had the Comet (or equivalent) in production sooner. It is only the allies lack of introducing new types of tanks that allowed the MK IV to carry on as well as it did let alone the hodge-podge of lashups the Germans used.
3601 quickly exceeded that 40 ton estimate, so morphed into the VK4501
VK3601 40 ton chassis morphed into 55 ton Tiger I chassis because Tiger tank program manager belatedly realized Germany had a copper shortage. Hence the otherwise perfectly adequate Porsche Tiger chassis with electric drive motors was unacceptable. That's the sort of design flaw someone in Heer ordnance department should have caught early on.
Germans had a problem in that the MK IV was one of the first tanks to carry a 75mm gun in a rotating turret and while it was more upgradeable than some tanks of it's generation it was getting a bit long in the tooth in 1944. Still useful but pretty much maxed out. Try putting it up against T-34/85s and see what happens, no Panthers to share the load.
Or M4s with 76mm guns. The US fell down getting the M-26 into service(both in timing and engine). It was late more due to doctrine/production decisions rather than technical problems. British should have had the Comet (or equivalent) in production sooner. It is only the allies lack of introducing new types of tanks that allowed the MK IV to carry on as well as it did let alone the hodge-podge of lashups the Germans used.
... In the case of the VVS, it made conscious decision retain obsolete equipment, and to implement new production of types that were barely adequate. the last i-16s were produced in 1942, the last LAGG-3 in 1943 and they were still in service in 1944. ..