Thanks for the link!

Everybody know the V1 : a little plane with a primitive reactor.

Everybody know the V2 : the first ballistic missile.

But praticaly no one know the V 3...

The V3 is a fabulous gun with additive chambers along the gun to improve the speed without improve the pression into the tube .
On the paper it is very simpel.
In reality it was "impossible"to use correctly in this time for a reason of synchronism :

t1: You have the munition in the bottom of the gun .

t2 : When the munition is firing, the shell go ahead .

t3 : the shell goes past a lateral chambre

t4 : a little ammunition is now firing in the lateral chamber to restaure the pressure.

t5 : an the same along the tube .

The problem is that,if an ammunition explose before (and not after) the shell the pressure decrease .. and the shell become unstable ..

Before elctronic firing it was impossible to use this gun correctly ...


Here you can see a video of the gun in theory .
The basis was effectively built but destroy before his use .

The site which the guns were fired from was destroyed from the air.