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Old 06-23-2013
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Mast leaning forward (new mast step)

Hi,

I am a beginner sailboat owner and have been working on a '74 Laguna Windrose since Feb 2012.. so I am trying to learn to sail while having learned (and still learning) how to build/fabricate & repair the darn thing!

I have replaced the mast bracket along with the cracked damaged fiberglass below it, I did this last year and beefed it up about a half an inch.

I purchased the replacement bracket from Dwyer Mast and although they have VERY LIMITED tech support and a very limited desire to offer advice on the application of their products, they did tell me that the mast is supposed to rest flat on the bracket (I guess it's actually called the "step"?). This makes sense to achieve a solid mast IMO.

With that being said, mine is definitely leaning forward. This happened b/c the surface on the deck is slightly slanted.

My question is this: Should I use a "shim" under the mast (if so what kind?) to level the mast or should I just leave it flat and thereby slanted. Or should I remove the bracket and build up the fiberglass??

Any input greatly appreciated.

Thanks!

Shawn T
Wichita KS
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Mast leaning forward (new mast step)-img_20130614_063742.jpg   Mast leaning forward (new mast step)-img_20130614_063824.jpg   Mast leaning forward (new mast step)-img_20130623_084745.jpg   Mast leaning forward (new mast step)-img_20130623_084758.jpg  
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Old 06-23-2013
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Re: Mast leaning forward (new mast step)

Shawn, so far as I've seen on a boat had (hunter 23) and other boats I've helped rig up. it's the pivot pin that supports most of the weight of the mast. If you can get the bottom of the mast to sit flat on the step plate in the vertical position it would be good but I don't think would hurt it either way. Later on in your learning curve you'll start to understand how mast top fwd and aft affect handling the boat.

Is your head stay long enough? (the front cable) and that would possible make the back stay too long.

Hope this helps a little
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Re: Mast leaning forward (new mast step)

Thanks for the reply.

Hmmm, you have me wondering now... the Dwyer guy told me that the mast should sit flat and NOT on the pin (as the weight would deform the bracket) - I guess the weight is supposed to be at the bottom of the mast and not the pin but I could be wrong. My pin is about 1/8" above the bottom of the slot in the side of the mast bracket and does not bear any load.

I lengthened my backstay and shortened my forestay to get the mast to pull forward and flatten out (there was a 1/4" gap under the front edge of the mast at the bottom).

I have seen that the mast lean does affect performance but may have seen most folks say that aft is good and forward is bad.

Thank You!
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Re: Mast leaning forward (new mast step)

I had something like this on my H23 years ago it was a bear to get the front pin in after raising the mast.

This is yours, it's a "Tabernacle" And yes it's pretty clear to me that the pin supports the mast at least during raising and dropping it.



If you were to "level" the plate with the tabernacle on it, you would need a wedge made out of something durable as Faster mentions. If you really want the mast to sit square on the tabernacle you would need to put it on the mast bottom to locate and drill the holes for the pin, then bolt it back on the boat. Then, the pin installed in the mast would only be used to slot in when your raising or dropping the mast. Would you want to cut the mast bottom to the angle of the boat deck? I guess you could.
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Last edited by deniseO30; 06-23-2013 at 11:20 AM.
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Re: Mast leaning forward (new mast step)

Your pics show pretty excessive fwd rake- likely far more than you want or need. The install of the step plate looks pretty clean.

I guess your two options are to remodel the install with an epoxy or some other base to 'level' out the step, or to trim the butt end of the mast to match the angle of the step. The latter is much quicker/easier to do....
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Re: Mast leaning forward (new mast step)

Quote:
Originally Posted by Faster View Post
Your pics show pretty excessive fwd rake- likely far more than you want or need. The install of the step plate looks pretty clean.

I guess your two options are to remodel the install with an epoxy or some other base to 'level' out the step, or to trim the butt end of the mast to match the angle of the step. The latter is much quicker/easier to do....
Thanks faster,

trimming that mast to a slight angle sounds like a good idea. I do hate to disturb the bracket. Yes it is leaning pretty good.
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Re: Mast leaning forward (new mast step)

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Originally Posted by deniseO30 View Post
I had something like this on my H23 years ago it was a bear to get the front pin in after raising the mast.

this is yours, it's a "Tabernacle" And yes it's pretty clear to me that the pin supports the mast.

Those are the same pics I seen and I too thought that. I don't think you would want the mast floating though, it would bend up that bracket fast.
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Re: Mast leaning forward (new mast step)

I did an edit on my reply. look above.
"If you were to "level" the plate with the tabernacle on it, you would need a wedge made out of something durable as Faster mentions. If you really want the mast to sit square on the tabernacle you would need to put it on the mast bottom to locate and drill the holes for the pin, then bolt it back on the boat. Then, the pin installed in the mast would only be used to slot in when your raising or dropping the mast. Would you want to cut the mast bottom to the angle of the boat deck? I guess you could. "

good luck!
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Re: Mast leaning forward (new mast step)

Quote:
Originally Posted by deniseO30 View Post
I did an edit on my reply. look above.
"If you were to "level" the plate with the tabernacle on it, you would need a wedge made out of something durable as Faster mentions. If you really want the mast to sit square on the tabernacle you would need to put it on the mast bottom to locate and drill the holes for the pin, then bolt it back on the boat. Then, the pin installed in the mast would only be used to slot in when your raising or dropping the mast. Would you want to cut the mast bottom to the angle of the boat deck? I guess you could. "

good luck!
Thanks! Someone else suggested trimming the bottom of the mast. I am still wondering how I can get it "machine shop perfect" with a belt sander though.

So I guess it's the shim or trim! Thanks again.
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Re: Mast leaning forward (new mast step)

you want the mast base to be square to the mast but if you do not want to redo the base you could round of the bottom of the mast so it will touch the mast base just under the pin, think rocking chair. on that small boat it will allow the mast rake be changed and the loads to be in the center of the mast base plate. the plate will spread the load out over the length of the plate. the compression loads should not be on the pin.
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