Cartridge QF Separate 18Pr

[Bonnex]

In response to a member's question about something I wrote ages ago on 18Pr QF Separate herewith a drawing dated 1935. I couldn't find my original text but seemingly trials were done c. 1935-37 using Mk IV cartridge cases shortened to 10.53 inches, 9.35 inches and 7.9 inches.

 

[2pounder]

I'm curious as to the reason to have a SL 18pr unless a higher angle carriage was also tested to give a more howitzer like weapon.

 

[hangarman]

The 18pr was superseded by the 25pr which used a separate charge so maybe it was a development thing ?

 

[Bonnex]

The 18pr was superseded by the 25pr which used a separate charge so maybe it was a development thing ?

Yes, I am sure that must be the case. There are quite a lot of OB minutes/procs on the 18Pr/3.45-in/25Pr development work although I could not find any direct reference to the particular drawing in OB Procs. The attached drawing of threaded 18pr cases might be of interest.

 

[ozziammo]

So what projectile would the QF seperate fire? I have a S/L projectile with an odd drive(rotating)band, looks like a 25pdr band, but the shell is definitely a 18pdr S/L. Regards Ozzi.

 

[Bonnex]

So what projectile would the QF seperate fire? I have a S/L projectile with an odd drive(rotating)band, looks like a 25pdr band, but the shell is definitely a 18pdr S/L. Regards Ozzi.

I am sorry to say that I don't know. There is a feint hand written note on one drawing of a cartridge saying "22 lb projectile?" and another reference suggesting that QF Separate would solve a problem where short range practice was the only option for training. If I come across anything that looks useful I will post it.