20km High Kite Flying
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- čas přidán 1. 10. 2012
- Most Ph.D.s focus on niche topics in a very specific field (see here) and Hilary Costello's research project is no different. Her ongoing Phd looks into the properties of aerodynamic stability of very long tethers for very high balloons or vew deep offshore oil and gas platforms underwater.
Understanding tether dynamics is extremely complex with numerous factors effecting the behaviour of a cable - from the shape and aerodynamics of the tether to the elasticity, bending and torsion of the materials used not to mention the chaging wind speed and temperature at heights of up to 20km.
Testing the cable dynamics of new tether designs in the real-world is a crucial part of the research process and by modelling and testing cables in isolated sections, it is possible to better understand and model how these may operate together in a larger system.
With limited access to mile-high balloons, Hilary can often be found in the green pastures of Cambridge University flying kites! Join her as she explains her quest to design an aerodynamic, stable tether that will reduce tension and, ultimately, lessen the risk of large-scale failure.
This film is part of a project funded by the Royal Academy of Engineering to develop the on camera communication skills of engineers across the UK.
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Could listen to her talk all day.
My team broke the world altitude record for a single kite in September 2014. We flew a 12 sq meter DT delta to 16,038 ft above ground level. Type 2014 kite altitude record into the search window for the video of the event. Our web site can be found via Kite Magic with a link from the home page. We have 5 other videos of our record attempts. I recognized the importance of aerodynamic line drag 12 years ago when planning for the world record attempts. We use the thinnest, strongest line available. This is braided UHMWPE (Dyneema/Spectra). I have developed a routine in excel which simulates all the forces in kite flights.
In 2007 I proposed an aerodynamic line profile. The Cd of round line is approximately 1.2. The contribution of line drag is about 3 times that of line weight. I anticipated aero line to be about twice as heavy as round line so their is a definite potential net reduction of negative line forces. I did not progress the concept beyond drawings but these aero lines may be applied to projects such as high altitude tethered wind generators. The Dyneema line would be encased in molded nylon extruded to an aero shape. The profile would be determined by wind tunnel testing but there is already a great body of work on aero profiles so a cataloged profile could be used. I anticipate that line flutter may be a big issue to overcome. Line vibration dynamics on very long lines are interesting. I also have an affiliation with the Ion Power Group which is investigation extracting Ionic charges from the atmosphere to charge large battery capacitor banks. I am advising them about the use of high altitude kites to support the extraction of Ionic charges through tethered conductors. The reduction of aerodynamic tether drag will be very important. After I am finished with 25,000 ft for a single kite in 2020 and 40,000 ft. for a kite train in subsequent years I may focus on aerodynamic kite tethers., preliminary designs of which I have already made. I also have sponsorship from a Japanese company which makes ultra high molecular weight polyester fibre (Toyobo/IZANAS)and a New Zealand line manufacturer, Tasline.
I saw this, it was awesome!!!
@DW Palme Droceretik is Robert Moore's email pseudonym. It's kiterecord backwards. Before your accuse someone of lying you should check your facts. The altitudes are as follows: 16,038 ft as taken directly from the GPS telemetry. The altitude submitted to Guinness was 29 ft. lower due correction for GPS calibration from government survey points in Sydney. Guinness rounded up to 16,010 ft. What about the date? Your apostrophe must be Robert Moore's team, not Robert Moores' team.
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@@robertmoore2527still not him though. I can change my username to same right now.
this some interesting click bait. I was lied to but the concepts are cool. The title would lead me to believe the world record for kite flying had been broken.
I would love to learn what you found out? I am hoping to be starting an MSc in Aerospace Engineering and this has really caught my interest.
Absolutely gorgeous tether
We used bait casting reel and fishing poles to fly our kites growing up in the 90s. I've never seen anyone else do it since. The nylon/polyethylene string was cheap and worked great.
What line weight should I use for flying 300-500m? Do you think 30# is enough?
I tried a different approach by adjusting the kite to suit the line drag. Hard to control at less than 200 m but when above the kite behaves well. Braided fishing line and a 2 m custom delta with a 60 degree sweep works well. I have had it up to 2000m measured by a hang glider vario.
I could watch physics explanations from this Phd. for days in a row.
Is that a 6M or 12M parafoil on that tether: which would be what 240daN or 400daN
There's a bit more code in the next film with Hilary, which I'm finishing up now. I'm not sure what she uses for her finite element modelling, but the image analysis (which you'll see in that film) is currently implemented in MATLAB.
I heartily agree that coding is cool, I just haven't yet worked out how to make films about it. Emphasis on the 'yet,' I hope.
So how is the aerodynamic line profile going Hillary?
I want updates on her research! Seems interesting
Some of us DO think writing code is sexy. What modeling framework are you using?
amazing Thank you!
you need a double tether so it dampens each other with rung pieces for spacers every 8x the width, a ladder tether.
Why it ended up so quick? Where's the second part?
Very Interesting...
I have just 'stubbled' across this video and as a long time kite flyer (40 years !) interested in the science of why kites fly this is interesting to me.
The flying line (never, ever call it the string !) is often the limiting factor when trying to fly at high altitudes, well high for me, approx 1000ft when i am allowed, by this altitude a smaller kite will reach its lift limit and due to its weight any additional flying line will lay across the ground, the aero drag making the line near vertical under the kite.
For any further experiments you may need another type of kite, i have never been a fan of the flowform type ramair inflatable kite, it appears to fly with more drag than lift not gaining a good flight angle, hence any experiments with the flying line will not be presented to the wind at the the best angle acheivable by a kite.
I had another version of 'parafoil' type kite, A Stratscoop by Greens of Burnely (ceased trading over 30 years ago sadly) compared to a flowform this kite has a much thinner aerofoil section and has an enclosed rounded leading edge, inflated by scoops on its underside (hence the name) this had a huge amount of lift and would fly nearly overhead in the ideal windspeed
Interesting. I wonder what the results were.
that didn't look like a 20km length of line on the that spool nice thesis though
Amazing.
You could start with broad strokes, RFP-level then cover the more interesting actual logical portions. Maybe even what modules are used; I'm not a ML user, but its interesting nonetheless (obviously).
Looking to make a kite or balloon with a fog net to get water from the clouds as part of Water Abundance XPRIZE. Looking for advice and team mates.
I concur
She's so cute! :)
You are gorgeous!!
Gross, leave her alone
@@australopithecus1118 lol
hermosa mujerona
she is beautiful and stabilizing kite invention
the stronger the thinner the better Kevlar
Misleading title. You flew 200 feet maybe.
call the misleading title police.
wow, pretty and smart
You talking to me?
Bravo Hilary! Very nice research and video. My research firm is involved in atmospheric research that sometimes includes the use of tethers. I'd appreciate speaking with you about your research.
I can be reached by using the company email address found at our website IonPowerGroup.com. Again, bravo! Lisa McCowen with Ion Power Group LLC.
Hello Lisa, small world. Did you read my post above I made 4 years ago? I'll be in touch soon about current developments in our high altitude kites. Bob M
20km is not possible, the sky is around 12km.
Then how do high performance military jets fly beyond 20 km and the U2 spy plane and Concord well above that? These aircraft require lift from atmosphere albeit very thin. My target for the kite train record is 40,000 ft. or 12,200 ft. Commercial jets fly at 14,000 metres (46,000 ft.). Perhaps you should look at Wikipedia before commenting.
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ya hiiii kaya kar raha ha
Be a whole lot most stable if it was ridged, wouldn't it? Stop it from fluttering in the wind. And my Grandma would smack you for "Using your teeth like that!"
school me plz
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