I have used the spur branded ones and they work extremely well. The two problems that we had were related to getting too much line on the prop before engaging them and once, the stationary side broke off. This was on a 2" shaft driving a 32/22 luke feathering prop so a significantly more powerful setup than any normal sized cruising boat would have. I have heard much better reviews
of spurs than the pizza cutter
ones but I have no personal experience with the pizza cutter ones.
Have you ever hooked anything? To me, the danger
of wrapping up a line would be to disable your engine
in an area that you could not sail or safely anchor
. This could be an area like going between two jetties or in a crowded mooring
field. If that is a situation you run into, it might not be a bad idea.
shapes do better or worse with buoys and lines. Boats with full keels and well hidden props seem to do much better than something like a saildrive
on a fin keel
boat. Exposed shafts with a downward angle seem to be particularly bad. If there is a line between two buoys close to the surface (going to a toggle for lobster pots), it makes it much worse. When you describe 500m of floating line, that sounds more like a net than a bunch of crab buoys.
If you don't get a set of cutters, you have a few different options. If there isn't much strain on the line and you hooked it while sailing, if you grapple the line from under the stern and walk it up the correct side of the boat, you can usually pull the buoy out. Most boathooks are not beefy enough to do this so you need an actual grapple (the solution that I use for my personal boat). You can also tape a bread knife to the end of a boathook and cut the line or use the boathook/grapple to bring it to the surface to cut it. Sometime the buoy will float free but other time, you won't be able to use your engine
works if the weather
is calm and the water
is warm but it doesn't work in exposed waters. I know a few people who have sustained serious injuries from diving
by either cutting themselves or being hit by the boat because of a wave. If you are under power and wrap one up, you are pretty much out of luck and hope that it is either calm enough to dive or there is wind