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Lift@worldparaglidingassociation.org
Most recent edit of this page:
Thursday, 25 October 2012
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Nove. 25, 2011,
Hi,
[quote] Joe, answer for me two
questions:
Firstly, how would you control a single tether glider? I you
wanīt
to somehow steer it, you must forcefully have another tether...
Basically, what sense is there in only having one tether, why in this
world would you want to do that?
And secondly, if you call paraglider to anything that glides, why
couldnīt
call it accordingly
hanglider, just for
giving one example amongst many? What drove you to choose the term
paraglider for any gliding thing, or even non gliding? Because dandelion
seeds DONīT
glide, nor do leaves... or fetuses in wombs.[/quote]
1. Please distinguish what I said from what others said; some things
that others wrote are not mine. Thanks.
2 Single-tether paragliders come in a variety and others are possible
Please distinguish what has been done and what is not yet done.
What has been done:
A. The historical paragliders were in two sorts and still are: framed
paragliders and unframed paragliders. Control systems come in a wide
variety without needed an additional tether.
B. The short single tether manned paraglider allows the pilot to grab
the airframe and perform weight shift for precis control of flight.
Sometimes addition non-tether controls are added to that main control
method, like variable geometry.
C. One may opt to install radio-control to servos.
D. One may opt to install smart robots that follow expert programs for
operating controls in the wing for flight control.
C. One may accept passive control and design the wing set elements to
morph passively to certain forces; when the result of such passive
control is acceptable,then deal would be done.
D. Mentioned in the discussion is the one compound tether and the
electrically-conductive tether; by such methods one my send signals to
wing-morph sensors for control and still have the one tether design.
Compound tethers may have multiple forms of signaling: liquid drive, air
drive, electrical signaling, oscillation signalling.
E. So, steering need not require another tether, if one or more of the
alternative control methods are part of the configuration.
3. I did not state that anything that glides is a paraglider; some of
the remarks by others are trying to slide that distortion over my posts.
Not the case. A sailplane is not a paraglider. A Lilienthal hang glider
is not a paraglider. A Batso hang glider is not a paraglider. Some
leaves are falling and gliding and are not paragliders. And the fetal
water kite was said not to be a paraglider, but only that later after
birth the person could one day opt to be a paraglider; please review my
post. Someone else also tried to say I was having the fetal kite be a
paraglider; I did not. The fetal kite is not gliding, as the placenta is
not falling through the referenced fluid. But the person later in life
has the potential of being a paraglider.
4. When the gliding kite multiple-line tether set meets at a bridle
point and the whole of resistive set is also at that identical bridle
point, then the system is with a tether set of the multiple line. But
now distinguish: if the bridle point of multiple bridle lines is not the
site of the resistive set, then the bridle lines one or many are just
that...brindle lines; then examine to see if the resistive set is down
lower with one single tether to the resistive set. When the resistive
set is much lower than the bridle point, then one might see a single or
multiple tethers. The discussion of the thread that you cam into is
supposed to focus on single-tether paragliders.
The Cage is a single-tether paraglider, but there are many other designs
historically and yet to be of single tether (even if above a bridle
point are multiple bridle lines).
From your notes, I pause to note: All paragliders are hang gliders. But
not all hang gliders are paragliders (like Batso hang glider). Gliding
kite hang gliders are paragliders; so the Falcon 3 is a paraglider.
Historically, the recent sport arena has an effort going that neglects
the mechanical history of paragliders and wants only one type of
paraglider to be paraglider; that would be a big loss, if successful.
Creative design over stiffenened---even up to fully solid---wings for
the gliding kite (paraglider) is a large open exciting realm.
Paramontante is just a tiny hint of the realm to be opened. Fully solid
wings of very low mass will be flown from single and several tethers in
gliding-kite mode for niche missions. Paragliders of multiple wings will
find increased uses in sport, science, industry, etc.
To begin to appreciate any merits in single-tether paragliders, one
might first look carefully over the varieties of possible and some
already-accomplished single-tether paragliders. The possible niche
missions are many. One of the superior niche applications is the
transcontinental travel hope for a single-tether paraglider. Also, the
large realm of radio-control paragliders of single tether at all scales
is an exciting field.
Many dandelion seeds do glide; they are very rarely perfect L/D=0 and
thus have a net glide. Indeed, it can be shown that it is nearly
astronomically impossible for the dandelion wing to produce L/D=0 except
at some occasional infinitesimal moments. Certainly not all leaves
obtain paraglider status, as many simply waft and glide and thus are not
paragliders. But many leaves of certain curl with fall-abscissed stem
will paraglide; when the stem mass as tether and resistive set is not
dominant as tug in the kiting sense, then the leaf is merely a
non-paraglider glider; however, even today I tested some fall leaves and
found some to be true gliding kites (paragliders); though many were not
paragliding.
The key is "gliding kite". And then next, how many tethers from
resistive set to bridle point. And not be stuck with "soft canopy" but
historically stiffened...and no reason not let the stiffening be
anything up to full solid. Paraglider needs tether to resistive set;
that has been true for centuries. The recent two decades sport realm
effort to close its eyes to the rich aviation world does not succeed
mechanically. A huge paraglider realm awaits designers and users. Any
wing in aviation is a possible candidate for tethering to a lower
resistive set that is falling through a fluid (air, water, other fluids)
for science, industry, sport, play, hobby, art, etc.
So, Pajarus, I do not subscribe to the broad anything that you stated.
Looking carefully just at what I wrote might help. Others have tried to
slip in a broadness over me just to mock me. It seems you are sincere in
your effort to discern the matters. I am sorry that if I have still left
out something. If you wish, further clarification by some back-and-forth
may occur.
Wishing you and yours the best of lift,
Joe
