Comments by "Vikki McDonough" (@vikkimcdonough6153) on "Hull Form Design - Doing better than a floating brick" video.

  1. 57:00 - Being longer and thinner can also hurt your speed directly if you take it too far. As the ship's aspect ratio increases, its surface-to-volume ratio also increases; if displacement is held constant, this translates into an increase in wetted area, which, in turn, increases the frictional drag on the hull as it moves through the water, and the wetted area (which is directly proportional to the frictional drag) increases faster and faster as you keep increasing the aspect ratio. Past a certain point, going longer and thinner will actually increase your overall drag, as the increase in wetted area will add more drag than you save by decreasing the ship's frontal area. (The balance between pressure drag and frictional drag is also important for aircraft, and is one of the big reasons why you don't tend to see a lot of airliners with enormously long, skinny fuselages, nor ones with stubby, bloated ones.)
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  2. 18:28 - Plus, getting rid of bulkheads won't actually help, since all the water is going to collect on the low side anyways - even without bulkheads, it won't magically flow uphill to the other side of the ship.
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  3. 25:45 - The wind speed is actually much less of a limiting factor for sailing vessels than it might seem at first glance; the main limiting factor for the speed of a sailing vessel is still the very-considerable hydrodynamic drag generated by the hull's motion through the water. If we neglect drag, a sail-powered vehicle can actually travel many times faster than the wind powering it (and this is true even when sailing fairly close to the wind), as demonstrated by iceboats and land yachts, which can easily exceed 50 kts in even moderate winds, and for which the world speed record is in excess of 90 kts (comparable to the takeoff speeds of many aircraft).
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  4. 2:38 - Actually, surprisingly enough, air still performs as an essentially-incompressible fluid until you start getting up to large fractions of the speed of sound (above ~ mach 0.6 or so).
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  5. 35:03 - RAMMING SPEEEEEEEEED
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