Messages in AirborneWindEnergy group.                       AWES28191to28216
 Page 4 of 4.
Group: AirborneWindEnergy Message: 28191 From: dave santos Date: 10/30/2019
Subject: Kite Vortex Lift Aerodynamic Parameter Identification

Group: AirborneWindEnergy Message: 28192 From: dave santos Date: 10/31/2019
Subject: Re: Kite Vortex Lift Aerodynamic Parameter Identification

Group: AirborneWindEnergy Message: 28193 From: dave santos Date: 10/31/2019
Subject: Review of Delta Wing History and Science in AWE Context

Group: AirborneWindEnergy Message: 28194 From: dave santos Date: 10/31/2019
Subject: TwingTec PhysicsWorld Podcast

Group: AirborneWindEnergy Message: 28195 From: dave santos Date: 10/31/2019
Subject: Re: Kite Vortex Lift Aerodynamic Parameter Identification

Group: AirborneWindEnergy Message: 28196 From: joe_f_90032 Date: 10/31/2019
Subject: Re: Kite Vortex Lift Aerodynamic Parameter Identification

Group: AirborneWindEnergy Message: 28197 From: dave santos Date: 10/31/2019
Subject: Re: Kite Vortex Lift Aerodynamic Parameter Identification

Group: AirborneWindEnergy Message: 28198 From: dave santos Date: 11/1/2019
Subject: Re: Review of Delta Wing History and Science in AWE Context [1 Attac

Group: AirborneWindEnergy Message: 28199 From: dave santos Date: 11/1/2019
Subject: Expeditionary Kite Electric Landboard Prototype

Group: AirborneWindEnergy Message: 28200 From: joe_f_90032 Date: 11/1/2019
Subject: Re: Review of Delta Wing History and Science in AWE Context [1 Attac

Group: AirborneWindEnergy Message: 28201 From: dave santos Date: 11/1/2019
Subject: Kites in Pop Culture- Island of Misfit Toys

Group: AirborneWindEnergy Message: 28202 From: dave santos Date: 11/1/2019
Subject: Wiggle-Kite Network Model, Reverse-Driven Stingray Locomotion WECS M

Group: AirborneWindEnergy Message: 28203 From: dave santos Date: 11/2/2019
Subject: Mega-scale Soft Kinetic-Kite AWES

Group: AirborneWindEnergy Message: 28204 From: dave santos Date: 11/2/2019
Subject: "Ockel's Dream": TUDelft and Kitepower shift testing to Curacao

Group: AirborneWindEnergy Message: 28205 From: dave santos Date: 11/2/2019
Subject: e-kite's "biggest fan"- The Woz

Group: AirborneWindEnergy Message: 28206 From: dave santos Date: 11/2/2019
Subject: Re: Review of Delta Wing History and Science in AWE Context

Group: AirborneWindEnergy Message: 28207 From: dave santos Date: 11/2/2019
Subject: Re: Wiggle-Kite Network Model, Reverse-Driven Stingray Locomotion WE

Group: AirborneWindEnergy Message: 28208 From: dave santos Date: 11/2/2019
Subject: Sprung or Inflated Landing Perch; Water Trebuchet Launching

Group: AirborneWindEnergy Message: 28209 From: dave santos Date: 11/3/2019
Subject: Japanese Antarctic Research adopting AWE

Group: AirborneWindEnergy Message: 28210 From: dave santos Date: 11/3/2019
Subject: South Pole AWE Early Adoption Case

Group: AirborneWindEnergy Message: 28211 From: dave santos Date: 11/3/2019
Subject: New Direct-Up-Wind (DUW) Modes

Group: AirborneWindEnergy Message: 28212 From: dave santos Date: 11/3/2019
Subject: LED Video Curtains for Kite Displays

Group: AirborneWindEnergy Message: 28213 From: dave santos Date: 11/3/2019
Subject: 3D Convective Wind Data

Group: AirborneWindEnergy Message: 28214 From: dave santos Date: 11/3/2019
Subject: Living in the Sky: Controlling Lightning with Lasers

Group: AirborneWindEnergy Message: 28215 From: dave santos Date: 11/3/2019
Subject: "Worse is better" v. "The Right Thing" in AWE R&D

Group: AirborneWindEnergy Message: 28216 From: dave santos Date: 11/4/2019
Subject: "Drop-Stitch" Aerotecture Pattern Language



Group: AirborneWindEnergy Message: 28191 From: dave santos Date: 10/30/2019
Subject: Kite Vortex Lift Aerodynamic Parameter Identification
It was a popular scientific paradox generations ago, that bumblebee flight was "impossible" under standard aerodynamic theory. It slowly came to light how many insects develop extra lift by powerful Vortex Lift on their wings, and so do bats, hummingbirds, and many other birds. A useful new flight regime based on vortex lift of strakes and delta wings at high angles of attack slowly was slowly perfected in both fighter jets and delta kites. The Concord and Space Shuttle landed by enhanced vortex lift. The NASA Power Wing (NPW) is a soft single-skin (SS) delta kite with vortex lift enhancement. 

Kites have long been known to operate effectively at high AoA, and associated vortex lift is readily attributable to the common swept surfaces and turbulating features of classic kite designs.

The kite vortex lift aerodynamic parameter is often misleadingly identified as "stall", because classic stall of a long wing causes an abrupt loss of lift and control, but vortex lift of a stubby swept wing actually increases well beyond normal critical angles, and stability is typically enhanced. Bumblebee aside, the funny thing is that vortex lift is also identifiable as as frontal drag; but in the inclined airframe reference frame, aligned in the normal lift direction, its lift.

================
"The full state vectors of the three kites were reconstructed and a data set with the aerodynamic force and torque, angle of attack and side slip angle for different maneuvers was created. However, difficulties arose for the aerodynamic parameter identification because the kites spent most of the time in a post-stall state during the flight."

AWEC2019- Flight Testing, Aerodynamic Parameter Identification, and Dynamic Simulation of Rigid and Flexible Kites Applied to Airborne Wind Energy Systems 

R.Borobia-Moreno1,2,D.Ramiro-Rebollo1,G.Sanchez-Arriaga1,R.Schmehl3 1UniversidadCarlosIIIdeMadrid,Spain, 2NationalInstituteofAerospaceTechnology,Spain 3DelftUniversityofTechnology,TheNetherlands
================







================
Group: AirborneWindEnergy Message: 28192 From: dave santos Date: 10/31/2019
Subject: Re: Kite Vortex Lift Aerodynamic Parameter Identification
Extending the analysis of kite vortex lift solves an interesting observed power kite flight anomaly. If one tries to hold a high-AR high-L/D hot power kite static, stalled low in the window, its very hard to control and the kite tends to fall down. At the same time, many a low-AR low-L/D traditional kite will just hang there happily. Obviously the traditional kite is using vortex lift that the hot kite cannot. This is bad news for hot kiteplanes in weak fluky wind.

We can now effectively identify the NPW as a soft delta kite, by its projected plan-form, that therefore develops strong vortex lift. This explains the anomalous excellent performance of the NPW compared to more complex more expensive power kites. It was a revelation at NABX2007 that the poor kite buggy pros with NPWs were competitive with expensive hot power kites. Each kite had its superior characteristic modes (see old discussions) and the general outcome was rough parity across all conditions. NASA developed the NPW 50yrs ago for maximal power-to-weight for space missions, and its still a top wing, by both vortex lift power and SS construction.


On Thursday, October 31, 2019, 05:53:27 AM CDT, dave santos santos137@yahoo.com [AirborneWindEnergy] <airbornewindenergy@yahoogroups.com> wrote:

 

It was a popular scientific paradox generations ago, that bumblebee flight was "impossible" under standard aerodynamic theory. It slowly came to light how many insects develop extra lift by powerful Vortex Lift on their wings, and so do bats, hummingbirds, and many other birds. A useful new flight regime based on vortex lift of strakes and delta wings at high angles of attack slowly was slowly perfected in both fighter jets and delta kites. The Concord and Space Shuttle landed by enhanced vortex lift. The NASA Power Wing (NPW) is a soft single-skin (SS) delta kite with vortex lift enhancement. 

Kites have long been known to operate effectively at high AoA, and associated vortex lift is readily attributable to the common swept surfaces and turbulating features of classic kite designs.

The kite vortex lift aerodynamic parameter is often misleadingly identified as "stall", because classic stall of a long wing causes an abrupt loss of lift and control, but vortex lift of a stubby swept wing actually increases well beyond normal critical angles, and stability is typically enhanced. Bumblebee aside, the funny thing is that vortex lift is also identifiable as as frontal drag; but in the inclined airframe reference frame, aligned in the normal lift direction, its lift.

================
"The full state vectors of the three kites were reconstructed and a data set with the aerodynamic force and torque, angle of attack and side slip angle for different maneuvers was created. However, difficulties arose for the aerodynamic parameter identification because the kites spent most of the time in a post-stall state during the flight."

AWEC2019- Flight Testing, Aerodynamic Parameter Identification, and Dynamic Simulation of Rigid and Flexible Kites Applied to Airborne Wind Energy Systems 

R.Borobia-Moreno1,2,D.Ramiro-Rebollo1,G.Sanchez-Arriaga1,R.Schmehl3 1UniversidadCarlosIIIdeMadrid,Spain, 2NationalInstituteofAerospaceTechnology,Spain 3DelftUniversityofTechnology,TheNetherlands
================







================
Group: AirborneWindEnergy Message: 28193 From: dave santos Date: 10/31/2019
Subject: Review of Delta Wing History and Science in AWE Context
Many traditional Asian kites are delta or diamond shaped, so the design history goes far back. In the case of insects, many moths have an iconic delta posture visible at rest and applied in evasive flight. The modern delta kite is the perfection of the architype. In formal AWE aerodynamic research, the delta has been largely overlooked in favor of long conventional wings. Current Vortex Lift Aerodynamic Parameter discussion fills gaps in the advancing kite engineering science. Wikipedia continues to advance as well, consistent with many early AWES Forum insights: On Delta Wings-

"(Delta wings) proved suitable for high-speed subsonic and supersonic flight. At the other end of the speed scale, the Rogallo flexible wing proved a practical design for the hang glider and other ultralight aircraft...The delta form brings unique structural advantages and aerodynamic characteristics...The long root chord of the delta wing, and minimal structure outboard, make it structurally efficient. It can be built stronger, stiffer and at the same time lighter than a swept wing of equivalent lifting capability. Because of this it is easy and relatively inexpensive to build...As the angle of attack increases, the leading edge of the wing generates a vortex which energizes the flow on the upper surface of the wing, delaying flow separation, and giving the delta a very high stall angle.[1] A normal wing built for high speed use typically has undesirable characteristics at low speeds, but in this regime the delta gradually changes over to a mode of lift based on the vortex it generates, a mode where it has smooth and stable flight characteristics. "

Inline image









   @@attachment@@
Group: AirborneWindEnergy Message: 28194 From: dave santos Date: 10/31/2019
Subject: TwingTec PhysicsWorld Podcast
Group: AirborneWindEnergy Message: 28195 From: dave santos Date: 10/31/2019
Subject: Re: Kite Vortex Lift Aerodynamic Parameter Identification
May have mixed this text up with a side email thread. Not even sure if yahoo will maintain posting history while deleting "uploaded content" (files, attachments?) Resending-


Furthermore, and this is new domain art, vortex lift is apparently a key aerodynamic parameter of high turning rate of low-AR stunt and power kites. High-AR race wings dominate in max crosswind velocity, but not max power, and turn quite slowly and loosely compared to the low-AR wings. The common LEI freestyle power kite has considerable planform sweep, and associated vortex lift, for fast turn-rate in tight turns. Vortex lift also explains which kites best maintain high power in tight turns.
On Thursday, October 31, 2019, 02:17:18 PM CDT, dave santos santos137@yahoo.com [AirborneWindEnergy] <airbornewindenergy@yahoogroups.com> wrote:


 

Extending the analysis of kite vortex lift solves an interesting observed power kite flight anomaly. If one tries to hold a high-AR high-L/D hot power kite static, stalled low in the window, its very hard to control and the kite tends to fall down. At the same time, many a low-AR low-L/D traditional kite will just hang there happily. Obviously the traditional kite is using vortex lift that the hot kite cannot. This is bad news for hot kiteplanes in weak fluky wind.

We can now effectively identify the NPW as a soft delta kite, by its projected plan-form, that therefore develops strong vortex lift. This explains the anomalous excellent performance of the NPW compared to more complex more expensive power kites. It was a revelation at NABX2007 that the poor kite buggy pros with NPWs were competitive with expensive hot power kites. Each kite had its superior characteristic modes (see old discussions) and the general outcome was rough parity across all conditions. NASA developed the NPW 50yrs ago for maximal power-to-weight for space missions, and its still a top wing, by both vortex lift power and SS construction.


On Thursday, October 31, 2019, 05:53:27 AM CDT, dave santos santos137@yahoo.com [AirborneWindEnergy] <airbornewindenergy@yahoogroups.com> wrote:

 

It was a popular scientific paradox generations ago, that bumblebee flight was "impossible" under standard aerodynamic theory. It slowly came to light how many insects develop extra lift by powerful Vortex Lift on their wings, and so do bats, hummingbirds, and many other birds. A useful new flight regime based on vortex lift of strakes and delta wings at high angles of attack slowly was slowly perfected in both fighter jets and delta kites. The Concord and Space Shuttle landed by enhanced vortex lift. The NASA Power Wing (NPW) is a soft single-skin (SS) delta kite with vortex lift enhancement. 

Kites have long been known to operate effectively at high AoA, and associated vortex lift is readily attributable to the common swept surfaces and turbulating features of classic kite designs.

The kite vortex lift aerodynamic parameter is often misleadingly identified as "stall", because classic stall of a long wing causes an abrupt loss of lift and control, but vortex lift of a stubby swept wing actually increases well beyond normal critical angles, and stability is typically enhanced. Bumblebee aside, the funny thing is that vortex lift is also identifiable as as frontal drag; but in the inclined airframe reference frame, aligned in the normal lift direction, its lift.

================
"The full state vectors of the three kites were reconstructed and a data set with the aerodynamic force and torque, angle of attack and side slip angle for different maneuvers was created. However, difficulties arose for the aerodynamic parameter identification because the kites spent most of the time in a post-stall state during the flight."

AWEC2019- Flight Testing, Aerodynamic Parameter Identification, and Dynamic Simulation of Rigid and Flexible Kites Applied to Airborne Wind Energy Systems 

R.Borobia-Moreno1,2,D.Ramiro-Rebollo1,G.Sanchez-Arriaga1,R.Schmehl3 1UniversidadCarlosIIIdeMadrid,Spain, 2NationalInstituteofAerospaceTechnology,Spain 3DelftUniversityofTechnology,TheNetherlands
================







================
Group: AirborneWindEnergy Message: 28196 From: joe_f_90032 Date: 10/31/2019
Subject: Re: Kite Vortex Lift Aerodynamic Parameter Identification
Group: AirborneWindEnergy Message: 28197 From: dave santos Date: 10/31/2019
Subject: Re: Kite Vortex Lift Aerodynamic Parameter Identification
Thank you, Joe. Thanks also to R.Borobia-Moreno, D.Ramiro-Rebollo, G.Sanchez-Arriaga and R.Schmehl for the analytic and experimental work that rigorously revealed the anomalous aerodynamic parameter, that any of several scholars or aerodynamicists in kite circles could also have identified as Vortex Lift, given the same prompting. Kite science is advancing as old loose ends and open questions resolve by the accumulated terrific efforts of so many.

As case notes, Brasington's best-of-kite-store Ninja turbine crab-claw design (used for KiteSat7) is clearly vortex lift enhanced, and large birds commonly land with each wing bent in a delta-form, developing high vortex-lift for optimal final deceleration. The top advantage of vortex lift in AWE is best low wind performance, to keep flying as other wings struggle and fall.
On Thursday, October 31, 2019, 09:51:04 PM CDT, joe_f_90032@yahoo.com [AirborneWindEnergy] <airbornewindenergy@yahoogroups.com> wrote:


Group: AirborneWindEnergy Message: 28198 From: dave santos Date: 11/1/2019
Subject: Re: Review of Delta Wing History and Science in AWE Context [1 Attac
State of the art simulation graphics-

https://my.eng.utah.edu/~ehan/math6790/project2/Report.html

Inline image

At this high AoA, without a large empennage, a high-AR flying wing would be dangerously unstable.





On Thursday, October 31, 2019, 03:32:42 PM CDT, dave santos santos137@yahoo.com [AirborneWindEnergy] <airbornewindenergy@yahoogroups.com> wrote:


 

Many traditional Asian kites are delta or diamond shaped, so the design history goes far back. In the case of insects, many moths have an iconic delta posture visible at rest and applied in evasive flight. The modern delta kite is the perfection of the architype. In formal AWE aerodynamic research, the delta has been largely overlooked in favor of long conventional wings. Current Vortex Lift Aerodynamic Parameter discussion fills gaps in the advancing kite engineering science. Wikipedia continues to advance as well, consistent with many early AWES Forum insights: On Delta Wings-

"(Delta wings) proved suitable for high-speed subsonic and supersonic flight. At the other end of the speed scale, the Rogallo flexible wing proved a practical design for the hang glider and other ultralight aircraft...The delta form brings unique structural advantages and aerodynamic characteristics...The long root chord of the delta wing, and minimal structure outboard, make it structurally efficient. It can be built stronger, stiffer and at the same time lighter than a swept wing of equivalent lifting capability. Because of this it is easy and relatively inexpensive to build...As the angle of attack increases, the leading edge of the wing generates a vortex which energizes the flow on the upper surface of the wing, delaying flow separation, and giving the delta a very high stall angle.[1] A normal wing built for high speed use typically has undesirable characteristics at low speeds, but in this regime the delta gradually changes over to a mode of lift based on the vortex it generates, a mode where it has smooth and stable flight characteristics. "

Inline image









   @@attachment@@
Group: AirborneWindEnergy Message: 28199 From: dave santos Date: 11/1/2019
Subject: Expeditionary Kite Electric Landboard Prototype
Inline image












   @@attachment@@
Group: AirborneWindEnergy Message: 28200 From: joe_f_90032 Date: 11/1/2019
Subject: Re: Review of Delta Wing History and Science in AWE Context [1 Attac
Group: AirborneWindEnergy Message: 28201 From: dave santos Date: 11/1/2019
Subject: Kites in Pop Culture- Island of Misfit Toys
Another one got past us; 2001 children's animated movie hit, with star voicing* and yet again the Kite as an iconic agent, with according anthem. Spoiler: a tail makes a kite a Misfit Toy.

Today's young adults were primed from infancy for a kite world.
Group: AirborneWindEnergy Message: 28202 From: dave santos Date: 11/1/2019
Subject: Wiggle-Kite Network Model, Reverse-Driven Stingray Locomotion WECS M
==== Notes ==== 

Leading Edge Vortex Lift reversed (?)

Flag-flapping, Strandbeest, Kinetic-Kite (wiggle-kite) precedents

Possible megascale kite network (metakite) dynamic mode

More hot Vortex Lift cases being identified. AWE as vortex-lift app

Another fine JimN kite review-

T-Rex Wiggle Kite



Flying in water or air is dynamically equivalent and mostly reversible physics-

A 3-D Stingray Model For Better Submarines
Group: AirborneWindEnergy Message: 28203 From: dave santos Date: 11/2/2019
Subject: Mega-scale Soft Kinetic-Kite AWES
The kinetic-kite is currently just a cool toy stick-kite that cannot scale well past ~10m spars, Both JimN and kPower confirm that its surprisingly powerful when the wind gets up, like holding a panicked goose. A vast soft kinetic-kite could be a GW unit-plant idea. kPower is preparing kinetic kite to operate by a shortline PTO network to the surface, as a scale model. 

While the stingray drives itself, the kinetic kite is driven. We know such "motor-gen" dynamics well, that inputting or extracting power around a neutral pumping frequency are adjacent states; inputting power is "just ahead of the beat", extracting is "just behind the beat". Every bike rider knows the feeling of coasting or pedaling along in alternation in hills, or jogging the pedals instead of rotary pedalling. Its the same relation for kinetic-kite PTO networks, and the bike's freewheel mechanism is what each PTO line needs to contribute kinetic energy to the surface work. 

The stingray is uncommonly good at swimming or resting along the bottom. A starting concept design for a mega-kinetic-kite is a round canopy composed of kixels (membrane-units at individual max handling scale, hanked onto the rope network) over an anchor-field. The center might be a ram-inflated dome, approximating stingray volumetic geometry, or even a hole, as the primary action is along the margins. Whichever way the wind blows, the windward lip is flown from the anchor-field as a playsail. A small plunging pitch oscillation at the nose would develop in-parallel with anionic edge waves along the margins will amplify as they travel aft, just as the common flag concentrates its forces at its trailing edge with such energetic flogging that no material has long withstood. The aft margin PTOs would be a source of super-powerful high-speed load motion. 

If a stingray body is passively towed, it will act as a kinetic kite. We see that both stingray and kinetic-kite bodies are cultivating and growing vortices that develop maximum vortex-lift power as they are shed aft. Lets see how kPower's PTO-rigged crankshaft driving kinetic-kite works out. Reverse-driven on small wheels, it should swim itself along the floor. Getting soft kite margins to develop strong anyonic waves will be another fun challenge.

Open-AWE_IP-Cloud
Group: AirborneWindEnergy Message: 28204 From: dave santos Date: 11/2/2019
Subject: "Ockel's Dream": TUDelft and Kitepower shift testing to Curacao
Wubbo Ockel's dream will surely flourish in Curacao, if anywhere, given world-class consistent and strong trade-winds, and critical need for locally sourced energy. Not so certain is what AWES architectures will prevail, but Kitepower is first up.

Just where on the island is Kitepower operating? Looks like maybe the airport, since air traffic is low, and AWE is simply a new branch of aviation to accommodate in shared airspace. Local observers needed to report what the venture does not. Local media coverage is probably already activated. Kitepower still processing the aftermath of its Valkenburg crash. Curacao will determine if line wear and single-line failure-point are chronic faults of the TUD architectural down-select.

Revealed in linked page is how Kitepower has finally moved to a RAT-charged control-pod.

Wubbo Lives!
Group: AirborneWindEnergy Message: 28205 From: dave santos Date: 11/2/2019
Subject: e-kite's "biggest fan"- The Woz
Group: AirborneWindEnergy Message: 28206 From: dave santos Date: 11/2/2019
Subject: Re: Review of Delta Wing History and Science in AWE Context
Bingo, this is a 1966 NASA delta-wing reference that accurately presents delta vortex lift insight, with close agreement of formal prediction and experimental data. Most pertinent is the data over a wide AR range. Kiter's know that the right-triangle delta is the best overall trade-off between higher and lower AR (~AR3), and here we have numbers to help explain that. Up to a point, higher AR boosts Cl helpfully, but once AR goes too high at high AoA, a wing becomes too unstable to effectively control, and Cl starts to drop again. At zero AoA, there is no vortex lift. For AWES, the widest possible match of variable load and wind conditions is enabled by vortex lift. Highest steady-state L/D is not as compliant a basis for kite power.

https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19670003842.pdf

On Friday, November 1, 2019, 11:40:33 PM CDT, joe_f_90032@yahoo.com [AirborneWindEnergy] <airbornewindenergy@yahoogroups.com> wrote:


Group: AirborneWindEnergy Message: 28207 From: dave santos Date: 11/2/2019
Subject: Re: Wiggle-Kite Network Model, Reverse-Driven Stingray Locomotion WE
==== more notes ====

Mega-scale Soft Kinetic-Kite

The kinetic-kite is currently just a cool toy, a stick-kite that cannot scale well past ~10m spars, Both JimN and I confirm that its surprisingly powerful when the wind gets up. A vast soft kinetic-kite could be a GW unit-plant idea. The stingray is uncommonly good at swimming or resting along the bottom. kPower is preparing kinetic kite to operate by a shortline PTO network to the surface, as a scale model. While the stingray drives itself, the kinetic kite is driven. 

We know these "motor-gen" dynamics well, that inputting or extracting power around a neutral pumping frequency are nearby states; inputting power is "just ahead of the beat", extracting is "just behind the beat". Every bike rider knows the feeling of coasting or pedaling along in alternation in hills, or jogging the pedals instead of rotary pedalling. Its the same relation for kinetic-kite PTO networks, and the bike's freewheel mechanism is what each PTO line needs to contribute kinetic energy to the surface work. The stingray works the same way. If a stingray body is passively towed, it will act as a kinetic kite.

A starting concept design for a mega-kinetic-kite is a round canopy composed of kixels (membrane-units at individual max handling scale, hanked onto the rope network) over an anchor-field. The center might be an inflated dome, approximating stingray volumetic geometry, or even a hole, as the action is along the margins. Whichever way the wind blows, the windward lip is flown from the anchor-field as a playsail. A small plunging pitch oscillation would develop in-parallel with anionic edge waves along the margins that would amplify as they travel aft. The common flag concentrates its forces at its trailing edge with such energetic flogging that no material has long withstood. The aft margin PTOs would be a source of super-powerful high-speed load motion.

Open-AWE_IP-Cloud

Good video of a round ray swimming close to the bottom, with lateral phase shifts to turn. The kinetic kite's asymmetric phasing is suggested.

Stock Video of Bluespotted ribbontail stingray (Taeniura lymma) swimming over sandy sea bottom. 4K ultra hd 2160p video footage at Adobe Stock


Another good aviation vortex lift page, but keep in mind that its quite robust even at lower kite sweep angles, like 45deg, compared to the discussion of supersonic aircraft, like fighters and Concorde, with ~60deg angles. 




On Saturday, November 2, 2019, 12:17:00 AM CDT, dave santos santos137@yahoo.com [AirborneWindEnergy] <airbornewindenergy@yahoogroups.com> wrote:


 

==== Notes ==== 

Leading Edge Vortex Lift reversed (?)

Flag-flapping, Strandbeest, Kinetic-Kite (wiggle-kite) precedents

Possible megascale kite network (metakite) dynamic mode

More hot Vortex Lift cases being identified. AWE as vortex-lift app

Another fine JimN kite review-

T-Rex Wiggle Kite



Flying in water or air is dynamically equivalent and mostly reversible physics-

A 3-D Stingray Model For Better Submarines
Group: AirborneWindEnergy Message: 28208 From: dave santos Date: 11/2/2019
Subject: Sprung or Inflated Landing Perch; Water Trebuchet Launching
As rigid wing kiteplanes scale up, landing on small perches becomes increasingly marginal. Some designs adopt eVTOL (M600) and others large landing gears (AP3). Both methods add flying mass, reducing performance.

A third approach is landing a large kiteplane on a very springy or soft perch. Nets have been long been used for landing small UAVs, but for a large kiteplane even net support spars need to be shock absorbing. Landing on a smooth airbag could be even softer, less liable to snag, and more damped than an elastic net, like a stunt fall-bag works.

A combination of these novel features can comprise a superior perch that not only eliminates eVTOL dependence and mass, but also may land the greatest fastest possible wing mass more gently than any onboard landing gear. 

As for a possibly superior novel perch-launch method, a possibly water-ballasted trebuchet perch could throw a large kiteplane into flight much like a paper airplane, maybe with a longer higher softer throw than perch platform rail-launch. The same landing spring spars could impart a high final "snap" velocity to gain max altitude upwind and maybe do an Immelmann back to the kite window.

Of course, takeoff from and landing on any sort of perch with a rigid kiteplane is not the most scalable AWES path, but methods described here, singly or in combination, may help reach the limits, and/or bypass patents.

Open-AWE_IP-Cloud
Group: AirborneWindEnergy Message: 28209 From: dave santos Date: 11/3/2019
Subject: Japanese Antarctic Research adopting AWE
On page 113 of the AWEC2019 Book of Abstracts, the Japan Antarctic Research Expedition reports years of kite-based meteorological research experience, and is introducing flygen recharging to data-collection, next intending groundgen AWES adoption. AWE collaboration with Spanish Inuit Windsled Antarctic program is in email discussion.

Polar AWE is really advancing fast by the most basic kite methods, like NPWs and pilot-lifted kite-trains. No doubt this progress will spread south. Yet again, as KiteShip, Skysails, and kite sports have proved, skilled kite riggers and pilots can do serious AWE with TRL9 COTS components, while bespoke energy-drone automation will long struggle to mature.
Group: AirborneWindEnergy Message: 28210 From: dave santos Date: 11/3/2019
Subject: South Pole AWE Early Adoption Case
Energy costs at the South Pole exceed 1.39USD kWhr, over 10x the global average. Its the most expensive energy market on Earth. Wind is quite decent, but solar is absent much of the year, and current diesel energy dependence is abhorrent to the scientists. Polar exploration is an AWE early adopter community, and traction kiting already has a fine track-record from the Pole. 

For all these reasons, the South Pole Station is a promising first-community to become mostly AWE powered.


Energy review of South Pole Station-


Wind data-
Inline image


   @@attachment@@
Group: AirborneWindEnergy Message: 28211 From: dave santos Date: 11/3/2019
Subject: New Direct-Up-Wind (DUW) Modes
Consider a DS looping kiteplane with high-velocity and high mass-density. It can penetrate well upwind of its anchor-point, far overflying its kite window. During the upwind phase, an anchor-vehicle can surge-tow DUW, then hold ground or momentum as the kiteplane harvests energy downwind. Nice physics demo, if not a very practical method.

Kiwee could also do DUW, by drive-wheel gearing. Could be practical. The two ideas could race each other upwind :)

KiteMotor1 accidentally reeled itself DUY, when the drive-loop knot jammed at the groundgen. I think at 2007 WKM One Sky fest.
Group: AirborneWindEnergy Message: 28212 From: dave santos Date: 11/3/2019
Subject: LED Video Curtains for Kite Displays
Group: AirborneWindEnergy Message: 28213 From: dave santos Date: 11/3/2019
Subject: 3D Convective Wind Data
ITCZ  AWE, here we come-
Group: AirborneWindEnergy Message: 28214 From: dave santos Date: 11/3/2019
Subject: Living in the Sky: Controlling Lightning with Lasers
Use AWE to power lasers that prime and tame lightning in controllable amounts. ITCZ, here we come-
Group: AirborneWindEnergy Message: 28215 From: dave santos Date: 11/3/2019
Subject: "Worse is better" v. "The Right Thing" in AWE R&D
In software engineering, "worse is better" is an old user-centric debate between a superior "right-thing" interface ( effortless user experience) over bloated code versus a "worse" difficult interface, over superior code implementation.

In AWE R&D the same cultural divide exists. Many teams seek simple "right thing", one-button launch-and-forget customer interface over complex underlying automation. Others opt for a simple "rag & string" AWES performance that demands "worse is better" skilled supervisory operations. Its a classic engineering trade-off parameter. Under "worse is better" theory, worse enters the world sooner and spreads, while "the right thing" is still putting its boots on. AKA, "the perfect is the enemy of the good".

Playing both sides is to start worse and end right over time.
Group: AirborneWindEnergy Message: 28216 From: dave santos Date: 11/4/2019
Subject: "Drop-Stitch" Aerotecture Pattern Language
Drop-stitch construction is how inflatable paddle boards and Peter Lynn's giant flag kites are shaped. In megascale inflatable architecture, the drop-stitch principle offers aerotectural possibilities to create livable spaces. Similarly, fabric "dart" structure, that distributes skin-loads in blimp envelopes and SS wings, forms ready walls and floors.

Someday vast ram-valve-inflated aero-urbanism could be based on this classic tensile structural pattern-language. There would of course be ample stored AWE to maintain flight and turgor pressure in times of no wind.