Boom gallows
A boom gallows is a smart addition which has at least two useful functions, even on boats which already has a top-lift or semi-rigid vang that prevents the boom from dropping onto the coach roof.
Firstly, it is a convenient way of stopping the boom from rocking back and forth (when not under sail) by pulling it down against one of the "notches" typically situated on top of the crossmember. Secondly, the supporting structure as such can be designed to provide convenient handholds for the crew when working on deck or climbing in and out of the cockpit. The design of this particular boom gallows was inspired by examples we had seen on some other Allegro yachts in particular. An important consideration when deciding on the exact shape and size of the main "hoop" was the fact that the sprayhood (am. dodger) needed to be foldable within it. On the other hand, the gallows' supporting frame musn't be made so wide or square-cornered as to hinder easy passage on deck, not even on the leeside when heeling. Furthermore, if made too tall, it may foul the boom when the main is sheeted down hard. It is difficult to make such critical tree-dimensional measures in "mid air", so I resorted to the trial-and-error development method, using 25mm plastic tubing (electrical conduit type) which can be easily bent with a heat gun. One inch stainless steel tubing, bent into the desired shape by a local specialist workshop, were then used in the final frame. A pair of standard "shark fin" stanchions (as seen on powerboat foredecks) make up the front part of the structure. The notched "beam" that sits on top was made from four 1/2" teak planks sandwiched together and shaped to a pretty, more or less traditional, camber.
Testing in situ with a dummy.
A tight fit around new sprayhood.
The angled stanchion base.
Teak beam shape
Tubing shape
Bomgalge
En bomgalge är ett tufft utrustningstillägg med åtminstone två användningsområden, även för båtar som redan har dirk eller