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18183

Another proa

https://www.youtube.com/watch?v=mvh0cXnCQaI&feature=youtu.be The proa was completed here (NZ) in my workshop except for the final painting. On the water is
Derek Kelsall
Aug 8
#18183
 
18182

Re: Daggerboard trunk edges

Larry, You might find this article interesting: http://www.duckworksmagazine.com/07/howto/rudder/ Fair Winds, Gene On Fri, Feb 17, 2017 at 6:04 PM, Larry Forgy
Gene Buchholz
Feb 19
#18182
 
18181

Re: Daggerboard trunk edges

Larry, all I have ever done is use 2" velcro tape at exit rear and top forward sides. It quiets the board when it used to chatter. That it might do more, I
Steve Studley
Feb 19
#18181
 
18180

Re: Daggerboard trunk edges

Yes, it is an oversimplification. The carbon will take more load than the glass in proportion to modulus and section area if they are oriented the same and in
Peter Southwood
Feb 19
#18180
 
18179

Re: Daggerboard trunk edges

Hi ôDont forget with uni & glass in the same layup the glass doesn't take any load until the carbon breaks.ö This is an engineering fallacy, which is so
Kerry Thomas
Feb 19
#18179
 
18178

Re: Daggerboard trunk edges

Thanks, guys, for all the comments, but I think I muddied the issue by giving too much information. I wasn't asking anything about daggerboards at all. I have
Larry Forgy
Feb 18
#18178
 
18177

Re: Daggerboard trunk edges

Agree with all Frederick says, plus it makes sense learn all you can from the failures. For example, ply with the grain of the outer lams running lengthwise is
Roger L
Feb 18
#18177
 
18176

Re: Daggerboard trunk edges

From what I've read the common practise of building boards out of glassed ply may be a big part of the problem too, as ply in compression across the plies is
Frederick White
Feb 18
#18176
 
18175

Re: Daggerboard trunk edges

You don't mention the design/type of boat or what the original boards were made of. If they keep snapping off across the bottom of the case it would seem to be
greg_walter2000
Feb 18
#18175
 
18174

Re: Daggerboard trunk edges

Failing under sailing loads, but how extreme? What do you want to fail first, the board or the trunk? If you make the boards stronger the trunk may fail first,
Peter Southwood
Feb 17
#18174
 
18173

Re: Daggerboard trunk edges

I suspect that radiusing the bottom of the trunk would actually make things worse by increasing the lever arm by the size of the radius. :-( You dont mention
Don Nicholson
Feb 17
#18173
 
18172

Daggerboard trunk edges

Over the years, I have broken several daggerboards, as far as I know from sailing pressure on the boards rather than hitting a solid object with them. In all
Larry Forgy
Feb 17
#18172
 
18171

Re: Repairing damaged hull

Have you already done the 12:1 grinding on the fiberglass? Otherwise the backing would get in the way. If it is not a compound curved area, use as heavy a
Steve Studley
Feb 3
#18171
 
18170

Re: Repairing damaged hull

I am repairing a fiberglass hull with a traditional layup, solid hulls, not cored. Pat
multihulldynamics
Feb 3
#18170
 
18169

Repairing damaged hull

I need to attach a light plywood backing plate on the outside of a hull to work from the inside part of the repair. How are people attaching the this "backing
multihulldynamics
Feb 3
#18169
 
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