" I just bought a new stunt kite and it
won't fly correctly if at all. After reading your
bridle adjustment
page , I suspect I may need to adjust the bridle, but I'm still a little confused by it
all. Can you give me some hints on how to set this thing up for proper flight?"
Still confused by bridle adjustments
after reading the bridle adjustment page? Not to worry, lets try an analogy that
will help you understand what the final goal that you're trying to achieve is.
If you've ever held
your hand out of a car window on the highway you may already know more than you think
concerning setting up a sport kite's bridle for enhanced flight. You will have noticed
that if you tilted the top of your hand into the wind it started lifting your hand and
arm. When you tilted your hand too far into the wind it would have very little lift
as the passing air would start escaping under the palm of your hand. As you tilted your
hand slowly back so that your fingers were pointed straight up you may have noticed that
the lift slowly decreased as you tilted it back. You may have also noticed that the force
of the wind hitting your hand had become much stronger than when your hand was tilted
forward a bit.
A delta sport kite reacts the
way your hand did when you were "window surfing". If you have wind but your kite
won't lift off, chances are the nose needs to be tilted into the wind by raising the
bridle just as you tilted your hand into the wind above. Tilting the nose "too"
far into the wind will have the same affect as above - you'll have reduced lift as the air
easily passes under the trailing edge of the kite just as the air passed under the palm of
your hand. Tilting the nose back by lowering the bridle has the same affect as tilting
your hand back until your fingers were pointing straight up. Slowly the kite loses lift,
just as when
you moved your hand back, until there is no lift at all. You want to find a bridle
position that is tilting the nose of the kite into the wind enough to make it lift and
fly, but not so much that it dumps the air under the trailing edge, if it is tilted too
far back on the other hand, it won't lift at all.
A good place to start is to
suspend your *fully assembled* kite by it's tow points from two clips in a work area with
a picture in your mind that the wind is coming straight from the ceiling. As you
stand back and look at the kite, the leading edge and spine will be roughly parallel to
the ground.
A good starting point is to have the nose slightly higher off the ground than
the tail of the kite. You can use a measuring tape if you like, but just eyeing up the
leading edge should work fine. If the nose is closer to the ground than the tail and your
kite won't take off you've just found the most likely reason, you need to raise the bridle
(slide the tow points towards the nose) until the nose is tilted into the wind (farther
from the floor than the tail while hanging from it's tow points).
*Exactly how much further from the
floor should the nose be as compared to the tail of the kite?* Different designs will have different angles of attack "built
into" them but a good rule of thumb might be to start with the nose 3 to 5 inches
higher off the ground than the tail. That means if your kite is hanging from the ceiling
by it's tow points and you measure the tail at 50" off the ground, you could adjust
your bridle so the nose measures 53 to 55" above the ground. Remember that these are
"starting points", they are meant for the folks reading this article that
can't get their kite to fly. After the kite is in the air it's time to fine tune: see
the
other
bridle adjustment page for this.
After any bridle adjustment,
it's important to check that both of the bridles are exactly the same on both sides. If
one is higher than the other for example, that side of the kite will lift more and flight
characteristics will seem unstable - not what a new pilot needs when just starting out!
With the kite still hanging from it's tow points, a quick eyeing up of both bridles will
assure you have them equalized.
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