[quote=“Shotmeister”]I did not realize, until today, that the 5"-25 was even used on surface ships. Just thought the 5"-38 was always the standard there.
Tony, you are far wiser in these matters than I but I have talked to veterans and read accounts that say that fixed rounds were used on subs. Of course, I am not even sure what a semi-fixed would be! There is a compartment on the base of the conning tower, a watertight tube, where ready service rounds were kept and reportedly they were in metal, water-proof containers which were opened and the round taken out, then to the gun. There was a elevator like tube from the magazine (inside the pressure hull) to the gun deck where additional ammo could be passed up. Seems like anything other than a fixed round would be very difficult to handle inside a submarine! I’m pretty certain that there was no fuze setting device on these guns because they were not intended to be used against aircraft on a submarine, strictly surface action only. They were used against small craft, such as wooden boats, which didn’t justify a torpedo.
The USS Cod’s website has some cool photos of the gun and associated stuff on that museum boat in Cleveland Ohio. It’s prestine and could probably fire right now!
Thanks to you both. The more I learn the wiser I become!
Traditionally there were 2 types of artillery ammo; 1) fixed and 2)seperate loading. 1) fixed-obvious- one piece ready to go into the gun. 2) seperate loading-projectile , charge and primer all loaded a piece at a time time-thus seperate loading. A third type was developed later in which the cartridge case containing the powder charge and with primer seated was loaded seperately. This is called SEMIFIXED pr sometime SEMIFIXED SEPERATE LOADING.
WHY? historically there were 2 basic types of gun sealing devices 1) German Krupp sliding wedge and 2) French DeBang interrupted thread .
The Krupp design required a case to seal the tube. The DeBang used a bag charge and a seperate primer. In general these 2 types are still in use today.
Fixed ammunition is only good up to a certain size. That size being what a man or 2 can carry and load.
The 5 inch 25 is pretty near the top of what a manual loader can do. If you look at the photos of the dry 5inch 25 reference above you will note that the shell are ready stored bottom up near the gun. These shells are fixed ammunition. If they were not the projectile would fall out of the case when it was lifted.
Semifixed ammo is easier to store in 2 shorter pieces.
There has been fixed ammo fielded over the years which required 2 men to load the shell. This was never a good idea. Slow to load and twice the problems.
The web page or the submarine “COD” in Cleveland ,refered to above, says
“Cod’s Ammunition Scuttle and ready-use ammo locker. The 5”/25 gun fires fixed ammunition—that is, the shell and cartridge case are fixed together at the arsenal where they were manufactured, and don’t have to be handled separately. Several rounds can be stored in the pressure-proof locker for immediate use. The pipe-like scuttle leads down into the pressure hull, and ammunition is passed up through it during a gun action".