Yup .
Fiiiine, my turn to state the obvious to get this moving along XD
KV-7 (object 226), a frankly weird idea to make a TD by mounting one 76mm and two 45mm cannons in a casemate on top of a KV-1 hull…
Another version existed with twin 76mm guns, just as useless, imho.
Heh, carry on mate.
Well, if we’re talking about weird double barrelled designs, then, by all means, let’s continue!
What could this thing be?
Hah, that looks almost like the T-28 Prototype Prototype that Wargaming brought out for the individual missions.
Excellent choice WoW!
One of the vehicles “envisioned” by the aptly named “Questionmark Conference” was the Hunter, a tank destroyer armed with twin 105mm rocket guns fed by 7 round auto-loaders.
You are absolutely correct, Mr. Malarz, you are indeed a connoisseur of esoteric vehicles.
Please proceed, the board is yours!
Thanx WoW!
This one’s a little different… we all know what it is, but here’s the question: where is it and what did it do?
Heh. I actually know this.
That is a lead-lined Sherman tank used at the Trinity nuclear blast site to recover soil samples from near ground zero.
It’s probably a Chrysler built M4A4 (interestingly, most A4s were sent as lend-lease to allied countries and the model was never used by the US Army in combat), made around April 1943 - it has the Chrysler distinctive type of drive sprocket, no direct vision, small hatches with “narrow” drivers’ hood castings, a 57° glacis, the later lifting rings and the later 3-piece differential housing with the protection lip, a “High bustle” 75mm turret with the pistol port and no reinforcement of the cheek “thin spot” on the right front of the turret, which were all features which only existed simultaneously on the Chrysler manufactured M4A4s. Of course, I could be wrong and it could also be a really mismatched Ford M4A3, but the chances are slim in that direction.
Besides the extra 12 tons of lead lining to protect the crew, on the engine deck this tank carries rockets that were supposed to be fired into the crater from 500m away, take a soil sample and then be winched back by wires, which worked eventually after an initial aborted run in which the tank stalled.
The tank was also fitted with four Watt’s type radiation meters with ranges of 0.1 to 100 R/h - two of them on the front, one on top and one inside. As befits a NBC protected vehicle, the tank was hermetically sealed and oxygen for the crew was provided from four cylinders located on brackets on the sides of the hull. The whole tank was also painted in reflective white.
There was also a second vehicle (looks like a Ford manufactured M4A3) with the turret removed who was used for a direct approach to within 15m of Ground Zero and used a trap-door in the bottom of the tank and a vacuum cleaner type device to collect samples.
Here they are both, in pictures taken fromanother board:
You are correct sir!
A blurb I read about them mentions the hazardous nature of their mission. The fear that the overloaded tank would suffer a catastrophic breakdown and subject it’s crew to a horrible death led to Enrico Fermi devising the later variant, with the rear deck mounted rockets. On it’s first run, the tank stalled. When the rockets were launched, they tangled their trailing cables… not an auspicious start!
Take it away WoW!
Thank you, Mr. Malarz!
Now, there’s a good chance this will be resolved in two seconds flat (some of it’s design features are, after all, kind of obvious), but it is an interesting little vehicle so I couldn’t let the chance to bring it to your attention pass me up:
Can’t put my finger on it. Looks like an early prototype of the PzKpfw II. Very like, actually. Wish I could put a precise reference on it. Totally wrong, probably. Best regards, JR.
Technically, you can argue our mystery vehicle shares a somewhat tortuous relationship with the PZII because both tanks were distantly inspired by the same vehicle, but that’s neither here nor there, because that particular vehicle was used in the interbellum period by over seventeen countries and inspired indigenous tank production in at least six of those.
Keep digging! 
First thought was along the lines of the M11/39 or a Czechoslovakian design like the LT 34??
It’s definitely not Italian, but you’re getting mighty close with your talk about the LT vz. 34…
An easy one for me, but, because my last enigma still stands and it’s probably time for me to let others answer as well, I won’t answer publicly.
Instead, I sent tankgeezer a message with the answer, and it’s up to him to confirm or deny I got it right.
Indeed you did Wings, you are all far too good at this game… 
And just because it’s proper,Wings’ offering is still in play. (I’m really interested to find out the name of your will-O-wisp, Wings)
The hull is an M6 but the rear of the turret looks more like a huge version of the one on the M26/M46
Keep at it,