Subject: Re: mast raising
From: Mike Crawford
Date: 10/12/2017, 12:37 PM
To: harryproa@yahoogroups.com.au

Doug,

  Thanks for the shot of the mast raising pole.  Rob had mentioned using that technique a few years ago (hauling up the main mast at its point of balance), but I've never seen it done.

  Engineering-wise, I like how simple it is, and how it doesn't stress the boat.  I could see it being threatening on a windy day, though, and certainly something you'd want to do on land.

  I have a gin pole setup on my catamaran that works, but it's stressful in a different sense.  The mast is pretty stable if you tie lines going out forward of the shrouns (in line with the foot), but it puts a /lot/ of horizontal stress on the ball that the rotating mast rests upon.  The manufacturer basically states that if you don't want to snap the ball, or over-torque the tube beam it sits in, you need to raise the mast the first ten feet by hand, and only then use the winch and gin pole.

  The system with the mast raising pole seemed like a better solution, particularly with the multiple bits and pieces used in cat2fold.

  Perhaps there's a compromise, where the mast raising pole takes the weight off the rest of the system, you then fit a temporary sleeve and winch the mast base into place with a line running down into the hull, lower it slightly, remove "downhaul", remove the sleeve, and then lower the mast the rest of the way.

  Or maybe just a very beefy hinge/step with a standard gin pole sytem.

        - Mike




doha720@yahoo.co.uk [harryproa] wrote on 10/10/2017 9:05 PM:
 
Well, I thought I tried all those for pictures.
the link did take you to photo album. 

Will try putting a pic here.



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