Zur Zeit arbeiten Hennes und ich fieberhaft daran das Geheimnis des Skybow`s
zu ergründen. Hennes hat bereits mehrere Bänder für den Skybow hergestellt.
Wir werden in Kamen unsere Versuche mit dem Skybow weiter durchführen.
Bei der Übersetzung haben wir einige Probleme.
"Wer kann uns sagen was "flagging band" ist?
Fotos und eine deutsche Bauanleitung wird es nach erfolgreicher
Durchführung an dieser Stelle geben:
Bei Interesse : Joerg.firstname.lastname@example.org
Jim's Skybow FAQ
What's a skybow?
It's a new kind of kite that acts sort of like an anti-gravity rope---when you and
a friend at the other end hold it across the wind it pulls upward making a huge arch
in the sky.
Who is flying skybows?
design and materials.
How does it work?
noticed that a dropped card or ticket stub can start spinning and glide
away from you as it falls? A skybow's ribbon is attached to swivels that
allow it to spin the same way.
So why does spinning make it go up?
a spinning ping-pong ball takes a curved flight. It's called the Magnus-Robins effect.
Okay, so why up instead of down?
start spinning in the correct direction---the top of the ribbon should
spin downwind. Other skybows have creased edges and always spin
the same direction, these skybows must be set up properly in relation
to the direction of the wind. If started spinning in the wrong direction a skybow
is just as happy to spin the otherway and fly into the ground!
Why does it make that eerie sound?
but the ribbon is constantly turning. This produces a rapidly varying reaction
against the air ---sound is the natural result. Since the ribbon has two faces,
the frequency of the sound is twice the spin rate.
A skybow flying well makes a howling sound reminiscent of the sound of high wind
in a pine woods, a skybow that is not entirely steady sounds like a motorcyle race,
with repeated accelerations and sudden downshifts of pitch.
Loudness increases drastically with wind speed. At 20 mph (32 km/hr) the curious
have been drawn from a quarter-mile (400m) away. The sound is very directional,
with a quiet spot near the fliers and directly behind them.
Why are there sometimes swivels in the middle of the arch, not just at the ends?
Multiple sections that spin idependently can accomodate differences in windspeed
along the skybow. Usually the fastest winds hit the high center of the arch.
Sometimes a single-section skybow is tapered---it's made wider in the center
than at the ends so that the high windspeeds at the center can be accomodated
when the whole ribbon is spinning at the same rpm.
How long can a skybow be?
skybow 5/8" wide (1.6 cm). Tony Frame and Jim Mallos flew Mr. Big over
the Washington Monument Grounds, Washington, DC on November 10, 1997.
The maximum length of a skybow is proportional to the strength-to-weight ratio
of the ribbon material. There are fibers made with ten times the strength-to-weight
ratio of Mr. Big's ribbon, so skybows two miles long (3 km) may be possible.
How wide can a skybow be?
(Tell me about your experiments.)
How do you launch them?
all at once, or in stages letting one section go up at a time.
How can I get one?