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Go Back   SailNet Community > On Board > Boat Review and Purchase Forum > Sailboat Design and Construction > seeking advice on tapering an aluminum mast
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Thread: seeking advice on tapering an aluminum mast Reply to Thread
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Topic Review (Newest First)
04-05-2010 07:47 PM
Maine Sail
Quote:
Originally Posted by sharedwatch View Post
No worries. I won't do it if it is dangerous.

I will gather up as much information as possible prior to cutting and welding. ...kind of why I posted the topic here in the first place.
You may want to ask over on Brion Toss' forum. My buddy Chris' brother is one of the riggers at Lyman Morse and even they chose not to taper his new spar. They ordered it tapered from the factory and had it shipped across country then painted it at LM.

Spar Talk (LINK)
04-05-2010 06:51 PM
sharedwatch No worries. I won't do it if it is dangerous.

I will gather up as much information as possible prior to cutting and welding. ...kind of why I posted the topic here in the first place.
04-05-2010 02:42 PM
PorFin
Quote:
Originally Posted by sharedwatch View Post
No worries. The reasons are Weight, windage, aesthetics.
OK, (again, I'm not trying to be a smartass) do the benefits outweigh the dangers?

Seems to me taking a chance on weakening your mast would wiegh heavily in the risk column, with minimal additions (weight and windage) in the benefits column.
04-05-2010 11:47 AM
sharedwatch
Quote:
Originally Posted by PorFin View Post
Jay,

Not trying to be smart here, just curious -- what's the benefit of tapering the spar?

No worries. The reasons are Weight, windage, aesthetics.
04-04-2010 05:06 PM
Faster
Quote:
Originally Posted by sharedwatch View Post
Alden Caravelle. I'm not too worried about negatively effecting the CE. -quite the opposite actually. I'll be adding about 6 feet to the rig and changing to fractional rather than masthead. It has been done before to a sister-ship and I have consulted with a naval architect about the rig change.
Ah.,.... Clever - all your headsails will still fit! That's great, I was just concerned that some ill advised butchery was ahead but obviously you're going about this the right way!

Best of luck.
04-04-2010 04:54 PM
PorFin
Quote:
Originally Posted by sharedwatch View Post
I would really like to put a taper in the mast and would like to hear pros/cons of doing this and any advice on how to do it.
Jay,

Not trying to be smart here, just curious -- what's the benefit of tapering the spar?
04-04-2010 03:38 PM
paulk We may have had one of those taperd Soling masts on our boat. It was certainly anodized after the welding was done, and held up fine. Sharedwatch has not yet advised the size of his mast or boat, so we have no way of kowing the loads associated with it. Up to a Soling size, rough guesstimates may be good enough. When you get much bigger, more precise info might be a good idea if you don't want the top fraction of your fractional rig to crack off the second time you crank in the backstay.
04-02-2010 09:12 AM
sharedwatch
Quote:
Originally Posted by Faster View Post
I'd be interested in what boat you're doing this to and what dimensions you are going to vis-a-vis the original rig. This could significantly shift the C of E of the sailplan if the mast isn't relocated at the same time. Details?....

As far as putting the taper in, strength/wisdom issues aside I believe it's usually done by cutting a vertical wedge in the leading edge, squeezing the section together again and welding the resulting seam.

Alden Caravelle. I'm not too worried about negatively effecting the CE. -quite the opposite actually. I'll be adding about 6 feet to the rig and changing to fractional rather than masthead. It has been done before to a sister-ship and I have consulted with a naval architect about the rig change.
04-01-2010 10:10 PM
Gary M Actually I have seen it done many times on Soling masts and unless my memory fails me, which it often does, they cut a tapered slit along each side and pinched them together and welded it up.

Did not seem to be overly difficult but there may be some thing to the heat treating. They may have shipped the spars out for anodizing and it could have had some form of heat treatment then ??
04-01-2010 09:43 PM
Faster
Quote:
Originally Posted by sharedwatch View Post
Greetings folks,.....I am re-rigging my boat and will be converting a mast section from mast head to fractional rigged.
I'd be interested in what boat you're doing this to and what dimensions you are going to vis-a-vis the original rig. This could significantly shift the C of E of the sailplan if the mast isn't relocated at the same time. Details?....

As far as putting the taper in, strength/wisdom issues aside I believe it's usually done by cutting a vertical wedge in the leading edge, squeezing the section together again and welding the resulting seam.
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