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RE: [ksurfschool] Foil AOA comish

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  • David Stanek
    Colin, All my # steps were totally related to paragliding. Someone asked before what this is all about. That s all I tried to explain. Regards David ... From:
    Message 1 of 5 , Sep 28, 2000
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      Colin,
      All my # steps were totally related to paragliding. Someone asked before
      what this is all about.
      That's all I tried to explain.
      Regards
      David


      -----Original Message-----
      From:
      sentto-1363319-444-970164433-staff=skylinewings.com@...
      [mailto:sentto-1363319-444-970164433-staff=skylinewings.com@...
      ist.com]On Behalf Of Colin Gowland
      Sent: Friday, September 29, 2000 10:59 AM
      To: ksurfschool@egroups.com
      Subject: Re: [ksurfschool] Foil AOA comish


      > 2. best glide - hands up = no brakes applied , you have best glide and top
      > speed on given line trim, but you sinking faster (On kite this is fast
      ride
      > with best upwind but a bit less pull).

      I'm not sure how much kitesurfing you've done Dave but from my experience of
      riding foils (not designing, only beginning to understand that) I tend to
      ride in what you call "best glide" mode ALL THE TIME. Brakes come on only in
      extremely underpowered conditions. Otherwise the kite is just pulling too
      much downwind and I get sucked into an apparent wind death trap. I need to
      have the kite set fast otherwise I can't handle the power. (PS I like to
      ride super-powered up all the time.. the only way to get incredible jumps)
      I'd really like to see someone handle an super-powered up foil and have some
      brake applied. Basically I am trying at all times to push the kite farther
      to the edge of the window so that it doesn't completely overpower me and
      brakes only hinder this action.

      > This is good, but there is higher risk of collapses in turbulence. You
      have
      > to watch your brake pressure and be in control all the time !!

      This has got to be some kind of myth or else symptoms of riding with no
      brakes in an underpowered situation. I haven't experienced very much luffing
      while riding. Maybe it's just my Concept Air kites though... but wait I
      didn't see any foil users in the gorge (F-One mostly) using brakes... or
      anyone on Flexifoil blades. They weren't luffing at all and they were flying
      2-line!

      . You can gain +15 km speed !!
      > BUT you are flying at the most sketchy trim - any turbulence and leading
      > edge goes to full collapse, recovery is messy and often followed by
      "tossing
      > your laundry" alias reserve chute deployment.
      > (With kites - way of recovery is also important)

      Well, the way Concept Air has setup the kites, you can pick between 3 knots
      to attach the flying line. Fast (for steady and stronger winds), medium
      (compromise) and slow (stable, grunt). The VAOAS system just let's you vary
      the position of the attachment point while flying the kite instead of on
      land. It really has nothing at all to do with brakes. If the kite feels like
      it is going to luff, you can just pull on the center line and it instantly
      reverses (increasing aoa and pulling on some brake when you pull enough line
      in) ... an easy recovery.

      . We also designed "power steering"
      > system which engage brake pull on wing tip when you turn the bar - I dare
      to
      > say that WET is fastest turning water kite right now!

      You could add brake like flying with handles to any foil and it would turn
      really fast. I prefer to turn without brake especially when powered up.

      Kite is very solid in
      > clean air, pull quite smooth and as every ram air in gusts needs faster
      > reaction from pilot.

      I tried it yesterday and I agree! Very smooth power! Quite user friendly!

      > We have the same brake tension adjustment ( it is not
      > "real" A0A trim - you just go for brake set up as per my #2/3 above) and
      it
      > helps to "calm down" kite in turbulence and control maybe 10-15% of power,
      > but is not as effective as sheet in-out on inflatable kites.

      Actually you do not have the same brake tension adjustment as the VAOAS.
      Which is pretty close to "real" AOA trim. Changing the flying line
      attachment point between AB and CD bridles changes angle of attack on a foil
      does it not? However you do have a similar brake tension adjustment to the
      factory Concept Air New Wave.

      Colin
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