Hi Luc,

I did a bit of strengthening in areas of SideCar (Elementarry Cruiser). It was mostly alwaysat the rudder. The bracket and attachment to the hull from the rudder blade.
I did break one actual rudder balde but that was a grounding and was pushed over sideways against the rudder and that was just too much for it.
Normal sailing loadds I guess are fine for what the elementarry design called for in the blade.

As for the pieces that held the blade - I never dir follow the original side mounted brackets style that may have been stronger, but I was only really missing out on some area that became stressed like needed an extra supporting member strut added on and not just some extra layers of glass.

The areas that I worry about are those important bits where rudder joins hull and last bears against socket in hull.

My fist masts when I took them out at the boatyrad were worn through with a big crack and must have been ready to snap. Then the big single (ballestron) mast broke off of Albany - due to huge bending back and forth in some swell waves.

Basically I underengineered the designs that I was trying. But only by a factor of 1 or 2. The design isn't really flawed, except by being a bit smarter in designing the extra strength.

The other vital area, the cross beams, never showed any issues..

It is kind of fun to find out where the limit point is and then you have a new factor to enter in for next time.

Doug
Perth.

PS - some of that carbon could make some nice supports, bearings etc.

--- In harryproa@yahoogroups.com.au, "Roger L" <rogerlov@...> wrote:
>
> The implications of strengthening any one area of a boat always fascinates me. Even a muddling amateur like me can so lots of interesting tradeoffs and choices......
>
> Something that puzzles me is that designing a sailboat to go faster seems to be the goal for most designers. But I've wondered if that is because buyers want more speed or because designing to known formulas for speed is easier than designing for all the unknowns of cruising?
> Roger L.
> ....
> ................Original Message -----
> From: LucD
> To: harryproa@yahoogroups.com.au
> Sent: Wednesday, May 01, 2013 1:13 AM
> Subject: [harryproa] beaching a HP
>
>
> I have read through some entries at boatdesign and it is clear now that regular beaching in Dutch like waters requires such strengthening of the hulls that one might as well stay with the local flat boat designs ... and miss out on speed potential. There is little compromise possible in a HP design I am afraid. But that is good to know and let that feature out of the SOR for a cruising HP.
> Luc
>
>
>
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