All sailboats have a detachable mast. In many places, they take the mast down and raise the vessel out for about half the season. a motorboat as much as around 30 foot might have its mast lifted off by a club mast crane (a tiny dockside crane with a hand winch, for raising masts on / off the club members' ships); over 30 legs you often need a mobile crane. Even the tiniest of these cranes - around 7 tons lift - will do this effortlessly, as a mast on a 30-footer only weighs around 150 pounds, and on a 40-footer, maybe 300 - 400 pounds.
If you're discussing lowering the mast yourself, with just everything offer, then stock ships that will repeat this will need to have a tabernacle. That is a form of mast installation that enables you to reduce the mast your self. We haven't seen such a thing over about 30 legs with a tabernacle, although in theory you might fit a tabernacle mount to virtually any measurements of boat - possibly around about 40 feet maximum, for practical reasons.
Some wherries and barges of considerable tonnage use tabernacle supports, however they had professional teams, huge winches, and are not rigged for leisure cruising. Norfolk wherries (inside UK) were supposed to possess some pro crews which could 'shoot the bridge': they might approach a bridge under sail, drop the mast, and raise it on the other hand of this bridge. Good luck thereupon :)
An alternative choice, employed by the courageous, is to use a connection to raise the mast off. You anchor upstream of this bridge, allow existing carry you downstream, and wind up underneath one side of the lowest connection with pedestrian access. Two helpers through to the bridge use a rope to lift your mast down and back to the deck of one's watercraft. I reckon you may need a bit of knowledge to get this done properly and without high priced consequences.
The secondhand ship marketplace is where you are almost certainly to find ships with tabernacle mast mounts. Maybe a location with a few streams with the lowest connection that an inward bound motorboat originating from seaward cannot pass under sail, and moorings upstream regarding the connection. Mobile some yacht agents such a location.
You need to be asking this question as this could be the problem you have: a mooring upstream of a reduced bridge, and water inaccessible with all the mast raised. Within scenario you see lots of engine cruisers, and couple of or no sailboats. It's very typical in which We stay, on England's eastern coastline. Ask around the agents.
You are able to retrofit a tabernacle mount to a sailboat, but there are several dilemmas:
- I'dn't go above 35 legs in ship size if you don't *really* know what you're performing.
- The design regarding the taberbacle itself is a specialised ability. Not many marine engineers will have ever handled a tabernacle mast mount.
- The limit shroud plans for raising and reducing are 'interesting' because of some certain changes which have to-be made. Once more, you never want a virgin focusing on that bit - it is the secret to security in mast whenever rising or decreasing.
- The deck installation must be quite strong. More powerful than is most likely in place, within the average fibreglass sailboat.
- The bottom of this existing mast must be customized. Once more, that is perform best maybe not entrusted towards the regular boatyard man.