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The V-3 was a long range cannon using multiple charges of propellant to accelerate a 6" shell to over 5000 ft/s. It was designed to be used for shelling London at long range. The paragraph below is quoted from :


https://www.danshistory.com/


"V-3 High Pressure Pump" "Hochdruckpumpe" "Millipede" "Busy Lizzie"

"Cover name for a massive multi-chambered gun of 490 ft (150m) length to be used in bombarding London. The 150cm (6 inch) caliber weapon had a convential breech at the rear and six auxilarilry chambers just in front of the breech. Designed to hurl fin stabilized shells up to a distance of 93 miles (150 km) the muzzle velocity of some 5,000 ft/sec (1500m/sec) was achieved by having a cartdridge in each auxilarily chamber fire in succesion after the convential cartdridge exploded sending the projectile forward. In 1943 some tests were conducted with various shells fired but no practical weapon came out of this as the shells were found to be unstable in flight. Up to as many as 100 of these guns were invisioned to be built in an underground complex at Mimoyecques, near Calais. The RAF suspecting that this huge concrete covered underground facility was a rocket launch site and bombed it heavily in 1944."


Ken Holloway
 
They had one V3 almost ready to bombard London. Churchhill knew its location, so they built a refrigerator sized bomb, and dropped it on the target. By luck, it went down a airshaft, detonating several floors down, setting off the ammo magazine... blowing the whole project sky high!
 
The Brits used a special weapon to 'reach out and touch' these hardened German targets. The Tall Boy was 21 feet long and weighed 12000+ pounds. It was designed to be dropped from about 40000 ft but the Lancasters could usually only make it up to around 20000 with this load. The fins were canted, the bomb spun up during descent, and it impacted at supersonic speeds. It typically buried itself 100 feet deep in soil and often penetrated reinforced concrete structures 15 to 20 feet thick (sub & E-boat pens at the coasts, V-1 factory roofs, etc). When it went off, it didn't so much make a big explosion above the ground, but it caused a 'seismic event' that would shake apart buildings, bridge supports, or pretty much anything else for several hundred yards around. Tall Boy was designed by Barnes Wallis (the same guy who designed the dam buster bombs) and built by Sheffield Steel in MONTHS during a war! (imagine trying to do that today). Tall Boy was superceded later in the war by the 20000 pound Grand Slam. There are websites somewhere (sorry for not having them ready to link here) with some pretty cool pictures.
If they had super-mega-penetrators like that 50 years ago, it kind of makes you wonder what they are dropping now over in the sand . . .
 
I found a link with some information about the Tall Boy and Grand Slam bombs, with some really good pictures for perspective <a href=https://www.bismarck-class.dk/tirpitz/miscellaneous/tallboy/tallboy.html>here</a>. All I gotta say is, "Holy S&!t, look at the size of those things!"

Loopy
 
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