Because they were intended to operate alongside battleships, cruisers, and aircraft carriers, American submarines typically had a fairly high speed for submarines of that time (The Gato made around 21 knots on the surface). This is why they were known as fleet submarines. American naval doctrine also dictated that submarines were supposed to support surface fleets in large battles, scouting ahead for the enemy fleet and engaging them if possible. They operated similarly to the German U-boats by raiding merchant shipping in an attempt to starve Japan out of the war, however they were also used for other duties, such as transporting agents and commandos, photographing islands in preparation for an invasion, etc. Although many people do not know it, the Gatos and other various submarines were one of the biggest contributors to the downfall of Japan and the Allied victory. The Gato class formed the backbone of the US submarine fleet in the Pacific Theater of World War II. Anyway, here you go,В the Gato Class NightmareВ Fleet Submarine. Oh well, when you try and build a submarine in a spaceflight simulator, i suppose some sacrifices have to be made. But despite my best efforts, I have yet to make this submarine dive-capable according to my desired standards. I do indeed have the craft complete, it sails on the water with a decent max speed, doesn't capsize (when handledВ responsibly), seats Kerbals on the bridge lookout stations, all that stuff. The sad part is that this isn't even as finished as I would like it, but KSP physics and my low level of skill have made sure that the perfection I seek is impossible to attain. Well, here it is, the demon that has been making me afraid to boot up KSP for the last month or so. So no, I doubt spaceflight could be achieved by 1100 (Hell, gunpowder wasn't even invented by then, and its place of origin, China, was largely unaffected by the fall of Rome). So not as much technology was lost of delayed by the fall of Rome as you would think. The first universities were also founded during this time, and scientists in the Middle East also made significant contributions to the field of medicine. The horse stirrup, three field crop rotation, trebuchet, and gunpowder weapons (among other things) were all invented (or stolen from China) in the Middle Ages.

People also assume that the Middle Ages were a time of little to no technological and cultural advancement, which is again, simply not true. You know, people often assume that centuries of technological advancement were lost when the Western Roman Empire fell, but as far as I know, the only thing meaningful (besides records and books and such) that was lost was Roman concrete, the likes of which was not seen again until the Industrial Revolution.

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