[ksurf] Re: RSVP kiteboard or board
> Which design has to be pushed?The most obvious way to much higher performance is to connect the traction kite to the board.
> Kiteboard or Kite
When you kite surf standing up with the kite connected to your hips or arms the maximum sail force (a small part of which is the driving force) you can resist is in the order of 400 N, 40 kg, 80 pounds.
If the kite is directly connected to the board the maximum sail force is only limited to the strength of the components. You can go for a tenfold force. Resulting in a some tenfold driving force. Resulting in world record speeds!?
The ordinary wind surfer (which also have a maximum sail force of some 400 N) would be history as a speed craft.
Viewed from behind this kite surfer should look like this:
The fin and kite parallel. The kite is connected to a point on the imagined line between the centre of efforts of the kite and the fin.
One way to achive this is to have the fin integrated with an arm which extends horisontally to leeward from the fins top until its end is on that line beetween the centre of efforts. The kite is connected to the leeward end of this arm.
This isn't a new idea. It is called a No heel rig.
As there is no longer any need for the sailor to stand up he better lay down to save air drag, specially at high speeds.
A bit of creativity will of course be needed to get this operational.
I have two bits of about kite sailing a bit down on on my ice skate sailing in wings pages http://www.bahnhof.se/~ansar/s.html :
1. A good traction kite could beat the lot.
2. Methods for measuring: Lift to drag ratio of traction kites and sailing crafts. Pull and Cl of traction kites.
I am (slowly) working on a related project. A sail connected with a some 5 m long tube to the skate of a skate sailor (who is in a personal streamlining). Related picture and text: http://www.bahnhof.se/~ansar/gli.html .
What you gain is an easy to control and sail as it is not on lines. The only thing you loose is that your sail can't reach up into the stronger winds above.
If you are interested in pushing sail top speed instead of kite surf performance my suggestion is to stand on a board in a wing: http://www.bahnhof.se/~ansar/la.html
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