Re: Centerboard trunk building primer?

[Christian Rasmussen <christian@xxxxxxxxxxxxx>]

Hi Warren,

See inline for some comments.

Warren Stevens wrote:

> Has anyone written (or would like to write) a centerboard trunk
> building primer?  Here are my questions:
>
> 1) Can you assemble the pieces and then drop it into the hull?  Or is
> it better to assemble it in place?
>  
you should build the entire thing (Mast step/centerboard trunk) in one 
peice and then put it in. A critical
part is to put it in straight. There is only so much correction you can 
do later with the blocks, so dont
rely on this. Also Gregs centerboard is as wide as it can be, leaving 
even less for correction.  Also Bram made
a new template for the trunk, so get that if your dont already have it.

> 2) I assume everything is bonded together with 405 fillets.  Should I
> use 1" tape on the insides and/or outsides?
>  
Where ever you use fillets you should use tape/cloth, otherwise it 
doesn't add much strenght. I did not use fillets
on the inside, but if you do, make sure the radius is small. (1/8 or 
so)  On the outside you can use as much
as you want and should make it fairly strong. Also up the side of the 
bulkheads. (full and half bulkheads)

> 3) The two 3/4" pieces the inserts screw into are bonded in with 4200,
> correct? (i.e. they need to be removable later)
>  

Correct. try only and use the 4200 on the outside edge. (not on the 
insert side of the block) That way you can
use a razor blade and cut them out.

> 4) Should the forward end be bonded to station 6? (I have to assume
> so...)
>  
Yes.  and fillets also.

> 5) Any hints on cutting the hole in hull for the insert (getting it
> positioned correctly and perfectly straight)?
>  

This is what I did. (There might be better ways) I position a long cedar 
strip running all the way down
the hull in the middle as my guide to get it in the middle. (Similar to 
they way you placed the soldiers)
Do a lot of checking. When you think its lined up use a glue gun and 
some cedar strips to keep it in place. Then fillet the bottom in as well 
as up the each side of  the fullsize bulkhead. One more check you can do 
before doing that, is to drill holes with a long bit through the hull, 
inside the centerboard trunk. Then make sure that it lines up on the 
outside. E.g. you dont want your  centerboard to sticking out an inch on 
the port side of the hull. (Even if it looks even from the inside of the 
hull)

> Any other hints and tips?
>
> Thanks for all your help.
>
> Warren
>
>  


This is the Swift Solo mailing list.  For unsubscribe instructions,
visit here: http://catzooks.com/swift-solo/