Re: [Paddlewise] Sailing a Klepper

On Wednesday 21 July 2004 07.22, you wrote:
> > PS The S4 sail area is 5 sq meters (about 50 sq. ft).
>
> 5 sq.m is about 55 sq.ft; I've looked through your new pictures, and was
> prompted to read all 4 phases of Dal's website again.  His final rig is 68
> sq.ft (28sq.ft  jib + 40 sq.ft Optimist, though listed 35 in specs). He
> tends to solve problems cheap, I tried this too, but eventually had to buy
> from Balogh and Folbot, and don't regret.  Dal claims an excellent upwind
> sailing with only 35 (40) sq.ft sail, so your S4 must be equally good with
> proper rudder and proper leeboard. He also says, btw, that his home-made
> leeboard (looks at least same big as Klepper's) is too small to prevent a
> leeway.

As yet I haven't used my own design leeboards ( see 
http://foldingkayaks.org/gallery/tord/leeboard_before_reinforcing ) but I 
think I'll just use one, and change the profile to symmetric ...

> May be I was too pessimistic about 60-65 degrees upwind sailing after
> fighting with currents, and missing last ferry to mainland :-).  It could
> be 50-55 deg, but I doubt it was anything better with an aft 32 sq.ft rig.
> I'm planning to add another, fore sail (smaller, perhaps 24 sq.ft) to my 32
> sq.ft aft sail on a hardshell kayak.  Mark Balogh assured me once that
> upwind rigs are "natural upwind climbers".  Not really, as I've found. Of
> course, he knows a lot and could mean something else.  Yes, they tend to
> turn into wind, but don't tend to sail well in this direction :-)... 

> Also, tacking with an aft sail always involves 2-3 paddling strokes, 
> and larger rudder is needed (and preferably foiled).  Such adaptations 
> are sometimes unique, - I couldn't find anybody with an aft rig on 
> hardshell kayak or Feathercraft Kahuna, except for experimental 
> Kahuna aft rig by Mark Balogh,  not suitable for my purposes. 

> Though, with Kahuna my task was easier due to
> Tony Niilus project with K1: http://www.geocities.com/niilus/ .  Most of
> dimensions I had to change, adapting it to my boat.
>
> Round tubes are probaly used on seas for aerodynamical and uniform strength
> considerations.  20 * 20 mm square tube has a diagonal same as 20 mm round
> tube, which means same size at certain directions as in 20mm round tube (=
> same wind resistance, or even higher due to turbulence around corners) ,
> but I.m not sure how much stronger is a square one.  And even then it will
> be stronger in some directions and weaker in others, while round one has
> uniform strength.  Just thinking aloud...

Buckling a round is on the other hand much easier to do, so they are not ideal 
in bending - in a normal rig the stays are there to help it from bucking. For 
compression, on the other hand, the round tube is without equal!

Tord,
rookie sailor
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