> - However one of our members, a boat builder himself, posted a link > to a basic introduction to stabilty calculations, which can be found > here in powerpoint form: http://www.ledgardbridge-boatcompany.com/ > pics/STABILITY%20EXPLAINED.pps > That's a very interesting presentation.
> Narrowboats are inherently not very stable things, partiularly the > smaller draughted ones, or ones with significant mass above the > waterline or with large or un baffled water/fuel/sewage tanks. > Weight on the roof seems the real killer - I remember an occasion at Shardlow when several people got onto the roof and she began to loll (i.e. to settle at an angle and then to roll and settle at an angle on the other side - it felt as if she had drunk too much and become tipsy). Fairly hurried orders for them to get down and we survived! I think lolling was the cause of two or three fibreglass boat accidents reported in the last few years - a largish number of people is a more significant topweight on a small fibreglass boat. I have heard of cabin steam launches (which have a fairly similar cross-section to a nb but much lighter construction) capsizing after a heavy snowfall. > > Hope this helps. > > > Daniel > Sean
