Forum du cerf-volant et du powerkite belge

Yep, je ne sais pas pour le ratio mais ce qui est sûr, c'est que tu dois viser une 5-5.5 pour la suivante.
Pour terminer,une 7,5 - 8 pour les petits vents et tu n'auras plus d'excuses pour annuler tes sess au dernier moment!!!  ;)

Par contre, forcément, en voyant les bluristes à l'oeuvre, je serai tenter d'acheter cela en BLUR mais quid des RAGE ? (Mercier133, tu as les 2 non ?)

Pour terminer,une 7,5 - 8 pour les petits vents et tu n'auras plus d'excuses pour annuler tes sess au dernier moment!!!  ;)

The next important dimensional characteristic is aspect ratio, or “A/R”. The A/R of a kite helps describe its shape and span wise profile and is arrived at by taking the square of the wingspan and dividing that by the area, or more simply, dividing its wingspan by the average chord. (see figure 2) Once again we have to generalize, but we can lump different A/R ranges into the following categories with their respective characteristics:

    * Low A/R ( 2.0 to about 3.0): Very stable, fast and quick to turn. Power comes on gradually as speed builds and it will tolerate gusts without getting overpowered. More tolerant of “lumpy” or gusty and irregular wind, as it is less likely to “luff” or fold up (“bowtie”). It generates low overhead lift.

    * Medium A/R (3.0 to 4.0): Still stable and usually predictable with greater power that builds up smoothly, but a gust will generate more power quickly. Slightly slower turn rate. They will travel upwind better than a lower A/R kite.

    * High A/R (over 4.0): These kites will accelerate quickly and produce a lot of power for their size. In strong gusts, the power build up will be sudden and frighteningly intense. Upwind performance is excellent. They will tend to be less stable, especially in erratic winds and require a lot of skill on the part of the pilot to fly well. Kites built for racing are almost always high aspect ratio.

Most popular recreational kite designs suitable for novices are a compromise of the extremes and have a medium A/R. Generally as the A/R goes higher, so does the power and the required skill level of the pilot. Here are some popular examples...

    * Hornet by Peter Lynn - Entry-level, stable fun kite. A/R = 3.0
    * Beamer IV by HQ - Popular entry-level all around recreational kite. A/R = 3.5
    * Rage by Flexifoil - Fast, low-lift, high-pull kite and a popular buggy engine. A/R = 3.5
    * Reactor by Peter Lynn - Like the Rage, another stable but powerful buggy kite. A/R = 3.8
    * Crossfire II by HQ - Powerful and lifty intermediate high performance kite. A/R = 4.4 - 4.8
    * Blade IV from Flexifoil - A powerful kite for intermediates and experts only. They are the undesputed king of lift. A/R = 5

    * Blade IV from Flexifoil - A powerful kite for intermediates and experts only. They are the undesputed king of lift. A/R = 5

Le ratio, c'est le rapport longueur/largeur

Sur base de la surface projetée je pense

Merci Vincent

  :ViveKiteJump: ::jevole::

The Flexifoil Blade 4.9 has earned the nickname Widowmaker, as it is strong enough to pull an adult off the ground, but small enough to drop you without any floaty parachute effect. The Flexifoil Blade kites are the kings of lift and must be treated with respect.

Other lifty kites include the HQ Crossfire