Given these figures the 4.7" was capable of putting 106.6kg of shot in the air each minute ... so the Modified W could put 426.4kg of shot in the air each minute.
The 10.5cm could put 363kg into the air each minute therefore the 1923 Class could put 1089kg into the air each minute. HOWEVER after numerous discussions it was decided the figure if 15 rounds per minute was too high so in my calculations I reduced this to just 10 rounds per minute giving the 1923 Class a rate of 726kg of shot in the air per minute.
"These figures" meaning the one half that which NavWeaps says... and you ask why we take what you say with a grain of salt. Using the value of 10 rounds per minute per gun which is not even the higher end of what
your source gives, then the Modified W can put about 850 kg into the air.
It's not so cut and dried now, is it? Especially when one considers that your shot weight given is 24.2 kg - and no 10.5 cm gun fired a
shot that big. That's the full round weight.
The shot weight was 15.1 kg (NavWeaps) for the 1934 gun, 14.7 kg for the 1930 gun and 17.4 kg for the 1907 gun.
So, let's do this all again, shall we?
German 1923 class
With 15 rounds per minute, the 1934 L/45 fires out 226.5 kg per min per gun of shell. Three guns give that as
679.5 kg for the ship as a whole.
453 kg if you use the 10 rounds per gun per minute.
British modified W
As for the Modified W, that has a 4.7"/45 naval gun.
Rate of fire is given as 7-10 rounds per minute with the
worse mounting, so we'll use both.
10 rounds per minute, it fires 22.7 kg projectiles (these are the shells, not the whole round) so 227 kg per gun, or
908 kg for the four-gun ship as a whole.
If firing at the lower bound, 7 rounds per minute, it fires
636 kg of shot.
And if it's got the mountings which are listed as giving a rate of fire of 10-12 rounds per minute, then it peaks at
1090 kg per minute.
In other words, the worst case scenario for the Modified W is slightly worse than the best case scenario for the 1923 class.
The same applies for all four-gun 4.7" armed British ships.
It seems from these numbers as though the three-gun 1923 class is worth between two and three 4.7" guns in terms of throw weight, using realistic rates of fire.