Comments by "Keit Hammleter" (@keithammleter3824) on "5 Fascinating Abandoned Ships" video.

  1. Back in the 1960's, concrete was mildly fashionable to make pleasure yachts out of. Cheap, but not very suitable - prone to cracking. There is an obviously deteriorating 20 metre concrete yacht near my engineering workshop, 30 km from water. It has been there for decades. Rumour has it that the owner/builder got cracking on building it when he realised how cheap concrete was, but ran out of puff after 10 or more years of building it and then finding out it would cost a small fortune to get it trucked to the coast and launched.
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  2. At 4:55 Mike states that steel is lighter than iron. So it is, but the difference is negligible. Pure iron has a density of 7.874 tonnes/m3. Mild steel has a density of 7.83 tonnes/m3. By "iron" Mike would be referring to wrought iron, which is around 7.75 tonnes/m3. The greater the carbon content the closer the density is to pure iron. It is the properties that matter - for some things steel is better, for other thing wrought iron is better. For a ship's hull, you want some elasticity to cope with wave-driven hogging and sagging, and with wave pounding, Steel is better in this regard.
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