#11
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Rick,
I take it the front foil pivots no? Also what do the cables do? Are they running rigging or standing? I'm quite interested in the workings of this as well as the aquaskipper: http://www.youtube.com/watch?v=g9bmLv6iUj4 I'm currently designing a boat for kite/human power, hopefully to use in the WaterTribe Everglades challenge, and am thinking of using an oscillating foil in lieu of paddling for the human powered part. I'm actually thinking it may be possible to have a foil mechanism that doubles as a means of propulsion when the wind is calm and a flying foil when under sail. Think I could take a look next time I'm down your way? |
#12
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The front foils pivot on an axle driven by the moment arm of the kneel attached to your calves. The rear fixed foils act as a stabilizer. The lines and central spring on the kneel provide slight tension to aid in the return on the foils during oscillation. Cal said once you start oscillating the foils you don't really need the return tension anymore. Guys have been using oscillating foils for propulsion concepts for sometime. I even recall one at the first manned UW sub races in Palm Beach. If you're going to be in town, send me a PM.
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FKA, Inc. transcribed by: Rick Iossi |
#13
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Another look at DARPA's efforts to utilize the Aqueon concept using newer materials.
Here is their summary of the program: Program Manager: LtCol John Lowell, Ph.D. The PowerSwim program is developing highly efficient, human-powered swimming devices for use by combat and reconnaissance swimmers. This program explores a new concept in swimming propulsion that uses the same oscillating foil approach to swimming that is exhibited by many fish and aquatic birds. This propulsion approach is more than 80-percent efficient in conversion of human motions to forward propulsion. Typical recreational swim fins are no more than 15-percent efficient in their conversion of human exertion to propulsive power. This dramatic improvement in swimming efficiency will enable subsurface swimmers to move up to two times faster than is currently possible, thus improving swimmer performance, safety, and range. http://www.darpa.mil/dso/thrusts/bio...lly/powerswim/ The actual inventor of this concept and over 50 years ago, Cal Gongwer hosted about four pool parties in which DARPA staff examined, used and questioned Cal at length about the Aqueon. DARPA then proceeded to consume almost $3M of tax payer dollars in the mandated creation of "new" technology. No credit or compensation has been given to Cal by DARPA in any of this. Doesn't inspire much pride or confidence in this government agency. They even have a promotional video now:
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FKA, Inc. transcribed by: Rick Iossi |
#14
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There have been some updates on Tom Lightfoots use of the Aqueon in a free diving competition on http://forums.deeperblue.com/freediv...st-past-6.html
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DYN 100 m With Aqueon 09/18/2011 This is swimming horizontally in a 25 m pool for distance. CWT 40 m With Aqueon 09/17/2011 This is a vertical free dive with constant weight Quote:
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FKA, Inc. transcribed by: Rick Iossi Last edited by ricki; 09-30-2011 at 09:40 AM. |
#15
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More from Deeper Blue:
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FKA, Inc. transcribed by: Rick Iossi Last edited by ricki; 09-30-2011 at 01:34 PM. |
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I just came across a local article about Cal Gongwer in the Sunsentinel, http://articles.sun-sentinel.com/198...ns-engineering . I didn't recall it but he competed in the first International Submarine Races held on Singer Island in 1989. I shot the race for a local rag at the time. I think I have a photo of his entry, have to go through the archives.
"Near 74, Calvin Gongwer Is Competition`s Old Man Of The Sea. June 23, 1989|By ELAINE A. ELLIS, Staff Writer Call him the sage of the sub races. Calvin Gongwer, who turns 74 on Sunday, is the oldest participant in the International Submarine Races being held this weekend off Singer Island. But this California guru of hydrodynamics research and engineering doesn`t confine himself to the ivory towers of academia. ``He`s so respected in the field, but he`s not a muckety-muck. He likes a good vodka gimlet,`` said Tony Carone, 42, the brawn behind Gongwer`s arm- powered entry in the local race. This weekend, Gongwer is getting his feet wet piloting his unique spherical entry in the race. He calls the clear acrylic orb the Knuckleball. Unlike the unpredictable pitches of baseball greats Phil Niekro and Hoyt Wilhelm, Gongwer`s Knuckleball travels in a straight line. This unique concept has three patents and ``kind of sinister`` potential for use on torpedoes, Gongwer said. Behind Gongwer`s tanned face -- reminiscent of an American Jacques Cousteau -- the wheels of invention are turning. ``He`s an inventor basically,`` said Joe Grosser, Gongwer`s son-in-law, who helped drive the 2,700 miles from California with Gongwer to the sub competition. ``He`s got a good imagination. That`s what it takes.`` Gongwer holds a degree in mechanical engineering from Columbia University, a master`s degree in aeronautical engineering from Cal Tech and about 80 patents, mainly for underwater devices. He has his own marine engineering company called Innerspace Corp. ``I made my first pair of swim fins in 1935,`` said Gongwer, who grew up on Washington`s Puget Sound. ``I love to fool around with anything related to water.`` Working in his California garage in the 1950s, Gongwer developed 15 submarines similar to the vessels assembled this weekend -- sleek, cigar- shaped tubes with funny fins and innovative propellers. Several of the concepts were patented and snapped up by the defense industry. One of the subs even ended up slipping behind the Iron Curtain on a spy mission, Gongwer said. He also invented the Aqueon swimming aid. ``Swim with no more effort than walking -- at speeds never before possible. Inspired by the efficient swim thrust of the porpoise using only leg power,`` the brochure boasts. With the Aqueon clamped to your legs, you can slice through the water at more than 6 mph. To prove his product, at the age of 52, Gongwer swam across Lake Tahoe. ``It was after that I got on this physical fitness kick,`` Gongwer said. ``I quit smoking. I`ve been on a fitness kick ever since.`` Once, Gongwer took up the land-lover`s sport of golf. ``I went through the game mathematically,`` he said. ``I invented clubs. I could do everything but really play golf.`` For the past eight years, Gongwer has been concentrating on building a massive tri-hulled, diesel-powered steel ship. The vessel can carry 135 people and weighs 400,000 pounds fully loaded. It can travel from Los Angeles to Sydney, Australia and back to Honolulu before refueling. ``I want to build one three times as big,`` Gongwer said. ``It would be ideal for a cruise ship. ``But that`s dreaming.``"
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FKA, Inc. transcribed by: Rick Iossi |
#17
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I am sorry to learn that Cal passed away in 2012. We used to talk by phone from time to time about the aqueon and experiences
of folks who used his device. He was a prolific inventor and will be remembered fondly for his many accomplishments, rest in peace Cal. http://d27vj430nutdmd.cloudfront.net...29ba2d5ea1.pdf .
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FKA, Inc. transcribed by: Rick Iossi |
#18
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https://www.youtube.com/watch?v=SMwT2N55raA I have read of some disappointment about Phelps not actually squaring off against a Great White in a fin race "Mono e Carcharodon." Ignoring practical issues with gaining the shark's full cooperation with shooting ques, instructions, makeup, etc., there may have been a larger lurking problem, potentially bad for insurance premiums if not ratings? The Lunocet fins Phelps was using rely upon a pair undulating foils for propulsion. Undulating foils can be an efficient means of propulsion for divers but works even better for fish. Here's the rub, I have used a undulating foil propulsion system for a few decades, the Aqueon. It is a neat way to rip through the water at speed. The thing is, it can send some marine predators into hysterics. I have had barracuda whipping all around me gnashing teeth, shaking heads in attack mode when I have been going full speed on one of these. They looked really excited, wanting to bite something but I stopped before they came in for a taste. I had been doing a fast inverted dolphin kick for some minutes gaining the second reef off Ft. Lauderdale from the beach in no time when this happened. I have even had dozing nurse sharks wake up and take interest which can take a lot of motivation at times absent a prod. I didn't have any free swimming sharks conveniently at hand when I've been swimming hard much less a Great White but I wonder what sort of interest the undulating foil might prompt in one of these big boys? I have assumed for all these years that the undulating foils crank out some distinctive sound underwater, perhaps like a wounded thrashing fish, aka dinner bell. It makes sense after all and whatever the cause, a distinctly negative outcome might occur if you crank at full bore with the foils. So, in hindsight, it might be better than Michael and the Great White were joined on a computer somewhere as opposed to together in the water. More about the promotional stunt at: https://www.facebook.com/RosenstielS...0nZ42ufh-H0hmQ ps - I have still failed to watch any produced content from Shark Week start to finish except from odd snatches online, like this. Perhaps the reruns, in a few more years? Some people just don't know what they are missing I guess. .
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FKA, Inc. transcribed by: Rick Iossi |
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