[MHml] Daggerboard Cases

[Dan Frenette]

On an F9A (aka home built F31) you want a flat bottom for trailering and 
beaching.  So think inverted and build that sold glass structure inside 
the boat with the cored case above that.

If it were me I'd contact Ian and stick with his recommendation's.  If 
he recommends core then stick with his plans exactly or ask first.  The 
smallest change here could be a real problem.

As far as wood goes, well keep it above the water line.  If you don't 
like sold glass because of the weight the think outside the box as it 
were.  Carbon yarn is cheap and builds up pretty fast.  But put the 
glass around it because you will want to run the carbon fore/aft but 
need the structure running up and down. I'm only using the carbon in 
this example to get some thickness and to spread point loads.

I do a structural tape buy winding carbon yarn around 2 pipes so that it 
builds a long belt.  Now cover the outside with sticky fiberglass 
drywall tape.  Now cover the exposed inside with  drywall tape as well. 
This is enough to hold the evenness you used to run the carbon yarn 
around the pipes.  With 12k tow this stuff is a fast high build tape for 
things you don't want to bend.

Dan Frenette

Dndeeley at aol.com wrote:

> Hitting something hard.  Were the boards exit the hull there is a very stout 
> keel of, 15" deep and 6" wide.  The upper aspect is embedded into a 3/4" 
> bulkhead.  On a very fast impact the board is going to go.  But is so solid I 
> don't that happening.  
> 
> Norm Deeley
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