Top Megascaling Principles
Here is the latest take on kite megascaling
theory-of-operation (please excuse some review)-
Several kite design principles promote megascaling potential. Aggregation
into stacks, trains, and arches is an old practice. For single kites, Dave
Culp (KiteShip) identified "single-skin" construction with "minimal
energy" surface geometry; these are the basis for KiteShip's OL ship kite,
the world record holder for the largest steerable power kite. Five years
ago, then collaborating with KiteShip, i asked DaveC to list all the ways
he knew that big kites can be passively stabilized. He said, "well, (one)
can "stake-out" a big kite." The remark did not make a sudden impression,
as the mission was to fly OLs from a ship, probably as a single line kite,
with "control pod" actuation. I continued to test professional kite
methods & flew big kites off arched lines after the model of kite showmen
David Gomberg & Peter Lynn. I discussed with Peter the "autozenith"
feature of his (& others) power kites, & he laughed when i found an
obscure stability mechanism in the wing-tips, but missed the major one;
that a kite control bar, held crosswind, in effect stakes-out the kite.
Kay Buesing exposed me to kite arches over a period of four years via the
World Kite Museum's annual "Kite Train & Arch Day". Washington State has
for two decades been the "world center of kite arches", thanks to Kay.
Kite arches set crosswind were consistently found more stable than single
kites (aggregate stability). Flying many kinds of giant kites on
single lines revealed linear limits of single-line passive stability
(dimensionless time analysis).
The lesson of these varied clues was that the major scaling limit to kite
structure is insufficient passive stability. A huge soft kite can be built
and flown, but one cannot count on active actuation to be either powerful
or fast enough for "five nines" reliability, especially with airborne
actuation. The only way to get powerful passive stabilization is to
stake-out the kite. The challenge is to see that the stake-out mechanism
scales to tens-of-km across, with the top of the kite arch structure
easily able to reach our "ultimate" 10,000 m altitude. Smaller megascale
kites can be rotated by "compass belay", but the largest sizes require a
radial line stake-out pattern with phase tracking (Iso methods). In effect
the kite arch now becomes a kite dome, and can be angled for any wind
direction or "wobbled" to sustain flight in calm. Various means exist to
operate safely over populations and other surface conditions.
Stake-out involves "captivity factor" and also exploits the ground surface
as "free" megascale compressive structure. Ground-based actuation allows
the fastest most-powerful response using industrial winches and no regard
for flying-mass limitation. Bulk industrial actuation evades the
aerospace-component pricing trap. Megascale kite structure,
as single control thread, eases realtime latency control computation
challenges. Its pretty cool that we are not limited to dinky mesoscale
single megawatt AWECS concepts, when what we really need is gigawatts.
~Dave Santos May
Comment and development of this topic will be occurring here.
All, send notes, drawings, and photographs!
Terms and aspects:
- OutLeader (OL) kite. Patent. Dave Culp.
- dimensionless time analysis
- aerospace-component pricing trap
- captivity factor
- Megascale kite structure
- Need for gigawatts
- aggregate stability
Commentary is welcome:
- The funny thing is that ideas at the real frontier don't have a lot
of web content, its up to us to create it. The main reasons for early
disclosure on this public forum (OSA- Open Source AWE) is to prevent
blocking patent monopolies & promote RAD (Rapid AWE Dev).
But there is a vast amount of foundational content behind this thread.
Just comb the text for search terms. KiteShip Gomberg+kite Lynn+kite
world-kite-museum. etc. The fancy words are mostly defined online or
KiteLab experiment media can lag months before posting online, but here
is the link-
Hope this helps...