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I don't think there has ever been any real explosive force comparison. I believe it's more of just a saying. A 15" shell X 3 or 6 or 9 depending on the cruiser can deliver a lot more punch than 8 x 60 but that 8 x 60 coming off an aircraft looks quite impressive.
True, but the higher performance WWII medium caliber aerial rockets used modified naval shells as warheads. Both the 60# 3.5" rocket's HE/SAP head (see Campbell "Naval Weapons of WWII" pg. 101) and the US HVAR ('Holy Moses') warheads were modified 5" shells. The latter upped body diameter to 5" too and w/ higher performance rocket got 1375 fps initial velocity, v 886 for the 3.5" but 2600 for a 5"/38 gun (though the plane had forward speed of a few 100fps and would fire at shorter range than a ship would typically). But a salvo of 6 HVAR from say an F6F in 1945 was literally identical as far as just blast/frag effect to the broadside of a Sumner/Gearing class DD, not a cruiser. As was mentioned, 'equal to a cruiser's broadside' was mainly just a saying, and actually seems to me I've seen it more often, and more accurately, put as 'equal to a DD's broadside' even in statements of the period.Most of a naval shells weight is in its steel structure, not explosive content
Tony do you have info on the HE content of the German rocket projectiles often used by ground attack a/c, the FW-190 being capable of carrying two IIRC and the Me410 four ?
They look pretty potent:
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According to "Janes" a WW2 British Mk XVI 6 inch projectile weighed 100 lbs, had a MV of 3100 fps and a ME of 6665 foot TONS. The explosive charge in a shell was not the only factor to be considered, the kinetic energy was enormous.
in contrast to their rarer direct hits on targets the size of tanks
1. Depends on the ship. Rockets in practice were used against unarmored ships, destroyer size or below though big enough to hit at a reasonable rate. Against those type targets, destroyers would use 5" common (the usual term for HE/SAP naval rounds of that caliber, essentially the same as rocket warheads). Just like a tank would fire AP against another tank, but not against say, a truck or AT gun position, where it would fire HE.1. Apart from the fact that everyone learnt early on that unless you used AP against another warship all you were likely to do was clear the seagulls from the rigging.
2. Try reading the book by Group Captian Desmond Scott RNZAF, it is strangely enough called "Typhoon Pilot".
Read up on the Cab Rank system and how devastating it was for the tiffies in 2nd TAF, especially in the Falaise Gap.
3. All 60 Pound rockets had a reported accuracy of 1% against a stationary tank-sized object at 300 meters range.