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-   -   Mainsheet Block (http://www.sailnet.com/forums/gear-maintenance/44481-mainsheet-block.html)

Stryker72 06-26-2008 11:53 PM

Mainsheet Block
 
I have a 14' O'day Javelin that I am in the process of redoing the mainsheet system and converting it to a 4:1 system. In this process I adding a new mainsheet block that has a different hole pattern than the original. This attaches to the centerboard trunk and I don't have a way to add a backing plate. I have been considering using 4 #10 self taping screws but I am worried that it won't be able to withstand the forces. The area of the mainsail is 90sqft. I would like to hear what the learned panel has to say.

sailingdog 06-27-2008 08:13 AM

IMHO, it is a really bad idea. A mainsheet can get fairly highly loaded....but you are talking a pretty small boat here... What would probably be better is to make a saddle that fits over the centerboard trunk and through bolt it through then entire trunk. Another option would be to make a board that has T-nuts embedded in the bottom, and glass it to the top of the centerboard trunk. That way, the mainsheet block would be bolted to the piece that was glassed in via the t-nuts, shown below.

http://www.nuvistor.it/articoli/thor/tnuts1.jpg

Stryker72 06-27-2008 10:22 AM

Quote:

Originally Posted by sailingdog (Post 334209)
IMHO, it is a really bad idea. A mainsheet can get fairly highly loaded....but you are talking a pretty small boat here... What would probably be better is to make a saddle that fits over the centerboard trunk and through bolt it through then entire trunk. Another option would be to make a board that has T-nuts embedded in the bottom, and glass it to the top of the centerboard trunk. That way, the mainsheet block would be bolted to the piece that was glassed in via the t-nuts, shown below.


I have been thinking about this option and have a couple of questions:
  1. I am assuming I would have to remove the gelcoat before I could glass the board into the trunk, what would be the best way to remove the gelcoat?
  2. How far down the trunk should I glass?
  3. When finished should I apply gelcoat or just sand and paint it? I worry about how a hand applied gelcoat would look

Thanks!
Paul

sailingdog 06-27-2008 10:27 AM

Random orbital sander with a 100 grit pad would do a nice job of removing the gelcoat.

Anything more than four to six inches would be overkill. :) It also depends on how many layers of glass you intend to put on... if you're doing two layers, four-to-six inches would be good...since you could taper the layers, having the first come two-to-three inches down, the next come four-to-six inches. If you were going to go with three layers, it might be better to do six-to-nine inches of overlap.

You can sand it lightly and then spray gelcoat using a Preval Sprayer. The Preval Sprayers are small, disposable spray guns, which use compressed canisters as a propellant. They're only about $6 each.

http://preval.co.uk/images/howtouse.jpg

Stryker72 06-27-2008 11:56 AM

Thanks SD!

sailingdog 06-27-2008 12:34 PM

:D Glad to help. :)


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