Recent content by sbg

This feels like we are getting somewhere - thank you fellows for your contributions thus far. After reading the comments above, there are a couple of other things to note. Narrow boats tend to be ballasted 'stern down' i.e. the draft at the stern is greater than at the bow as this has been...

16"

I'm trying to understand the angles of pitch and roll induced by the boat hanging up, and the water level drop that would be needed to swamp the stern starboard cant. Without carrying out any photogrammetry, I think we have to assume that that hang up was (as stated) about 10' from the bow. the...

Found them. The first image shows the alignment of the lock wall and the bulge in the stonework. The second shows the scarring / witness marks from the hang up, and the third (very sad) shows the boat once the lock had been drained.

Yes, the other boat in the lock could have prevented any great sideways movement although I had a narrowboat briefly hang in a single-width lock a few years ago. The boat that sank is a standard width narrowboat so should be 6' 10" wide along most of it's length; the baseplate would be slightly...

Here's what I think happened: Under normal circumstances the boat has a single centre of gravity, with a centre of buoyancy. The hangup creates a second point, carrying some of the weight (apparently up to 33% if the bow is completely lifted out and the snag is 10' back on a 60' boat), with...

No - this was not a cilling event although you are right in that the majority of lock sinkings are down to the boat either being on the cill (usually at the stern) or a bow / stern fender becoming wedged in the gates and hanging up. I am an experienced boater and want to understand more of what...

Ah, that makes sense.

Was the boat roped to the centreline t-stud, forward or stern points?

No videos available and the only pictures are after the event and the subsequent draining of the lock - not helpful in this case. The water came over the starboard stern cant, primarily due to the induced pitch / lowering of the stern but exacerbated by the roll.

Thanks for the replies so far folks - I appreciate it. Apologies if the initial statement was a little vague - I now have more information from the owner. Anorlunda - yes, that is the correct type of boat. 60' long, 6'10" wide and (mostly) flat bottomed. It 's a common inland waterways vessel...

Hi everyone, this is a real world problem following the sinking of a narrowboat in 2014. The boat caught on the side of the lock as the water level dropped, and the resultant combination of pitch and heel resulted in the boat taking on water at the stern and sinking - luckily with no loss of...