Hang gliding 1974 part 3
This page continues from Hang gliding 1974 part 2.
Many of the images on this page are artistic derivations of contemporary photos. See Copyright of early hang gliding photos.
These photos of Roger Platt of Poole in Dorset, England, are by Roland Lewis-Evans, who was to become a leading hang glider sail-maker. Roger bought this glider from somebody in Brighton, Sussex, via an advert in the weekly periodical Exchange & Mart. We suspect that it is an early Skyhook with a replacement control frame and a stand-up webbing harness, like that made by Wasp in Surrey, rather than a Skyhook seat harness. Notice the absence of top rigging and the flapping of the distorted sail.
Roger previously manufactured surf boards. In keeping with the ‘surfing model’ of early southern California hang gliding, wittingly or otherwise, together with Pete Jordan, he started manufacturing hang gliders and harnesses under the name Kestrel Kites in Poole.
To impart a flavor of the difficulty in learning to fly a hang glider at this time, here is disillusioned New Zealand television producer John Veysey, who received his first hang gliding lesson in 1975. (What he refers to as the cross-bar is the control frame base tube)…
The two men had let go of the wing-tips and were shouting at me: “Pull the bar in! Pull the bar in!” With its nose facing upwards, the glider slowed to a halt. We had lost flying speed and it was too late for me to pull the bar in before the ground came up at us in a hurry. I lifted my feet high thinking I’d be air borne that much longer. My fingers, clenched round the cross-bar, took the full impact of the crash but my body plunged through the A-frame without injury.
“Very good, Very good.” said the instructor running up to me. He looked genuinely pleased. “Would you like another go?”
“Yes. Yes please” I said.
— John Veysey via e-mail August 11th, 2020
Technical: Roger is clearly experiencing difficulty in getting the glider nose-down enough to gain adequate airspeed. The large amount of billow undoubtedly caused a forward center of lift, which would account for that. All these gliders seemed prone to lurching to one side or the other as a result of turbulence. That might be because of the pointed wing tips: Some years later, Rollin Klingberg discovered that the ‘stickiness’ of air molecules (so-called Reynolds number) causes airfoils of short chord — such as those at the tip of a standard Rogallo — (at the short spans and low airspeeds of hang gliders) to stall at a comparatively low angle of attack. It seems to me that could affect standard Rogallos even with their huge washout (wing twist). When batten-supported tip roach was introduced the following year, gliders so equipped seemed to me much better behaved (as well as being more efficient).
I (the original author of this web site) saw John Jenkins’ glider flying subsequently and I was struck by the way its thin rip-stop nylon sail rippled audibly–a kind of muted rustling–yet it seemed to perform at least as well as other hang gliders of the time.
Meanwhile, in the USA…
While these pages generally refrain from depicting the many variations of structure and wing shape that were tried at this time, this serves as an example of a reasonable adaptation that fell to the scythe of natural selection. It is one of two standard Rogallos of different manufacture at the same event where the control frame is shaped to better accommodate the pilot in a prone harness. As it turned out (reasoning retrospectively) the advantage, if any, was outweighed by the need to use stronger tubing (the down-tubes are under compression, so are ideally straight) as well as incurring higher manufacturing cost and more difficulty in folding it neatly alongside the main tubes in the glider’s de-rigged state (for transporting and storage).
For more images and links to film and photos taken at this event, see Elberta Dune, Michigan, July 1974.
Many pilots in these early days only gradually became aware that hang gliding was not like off-road bike riding where, if you came off, your chances of being seriously hurt were slight. (I had already been hospitalised before even getting off the ground. Have you ever seen the workings of a knee joint — your own — between the exposed thick skin and muscle of a horizontal gash? I do not recommend it.)
To illustrate the point, here is an excerpt from Larry Fleming’s delightful little account of the early days of hang gliding in the USA:
Sometimes pilots attempt a three sixty in front and below the cliff and end up misjudging the distance. They would plow into the sheer wall with a twenty-five mile an hour wind pushing their thirty mile an hour glider at fifty-five miles an hour ground speed. It was like a fly hitting a windshield on the freeway. The pilot’s body took most of the impact, the wing tore and slid down the cliff side in a twisted mess of broken tubing and flapping sail with not even a scream coming from the pilot above the noise of the pounding surf because his brain had been smashed.
— Larry Fleming, Downwind, a True Hang Gliding Story, 1992
See the Point Fermin page for more about this treacherous site.
Mike Markowski’s Eagle III was an attempt at achieving the performance of contemporary rigid wings such as the Icarus V combined with the portability of a Rogallo. See Scientific American hang glider for more about the Eagle III and its designer.
For the film from which this screenshot is taken, see Four-G test under External links later on this page. See also the related topics menu Testing for stability and structural strength.
Frank Colver, famous for creating the first popular audio variometer used widely by hang glider pilots (see Sound barrier on the Variometers page) additionally combined conventional aerodynamics with existing hang glider technology to obtain greater performance. At this stage nobody really knew whether advanced designs such as the Skysail would consign the simple Rogallo wing to the dustbin of history.
See also the link to the US Hawks forum under External links later on this page.
The annual hang gliding festival at Telluride, Colorado, attracted pilots from all over the USA and some from other parts of the world. Colorado train conductors used to announce, “To hell you ride.”
On the way to Town Park, the pilots’ meeting place, we walk along Main Street, past Victorian houses and quaint saloons, reminding us of the Wild West.
— Ulrich Grill, translated by Heidi Attenberger, in Hang Gliding, June 1994
See also the related topics menu Telluride, Colorado.
At Joe Faust’s urging in 1971, Dick Eipper sold plans for his standard Rogallo hang glider for $5 each…
“…by 1973, Eipper-Formance, a corporation I formed with three friends, grossed close to one million dollars and had 52 employees on the payroll.”
— Jennifer Drews quoting Eipper in her article ‘USHPA Member 00001‘ in Hang Gliding & Paragliding, June 2008 (link later on this page)
Film of the glider in the image or an identical one appears in the Wings of the Wind video, linked farther down this page, labelled Flexi Flier at Point Fermin.
In 1975 I (the original author of this web site) tried out an Eipper Flexi Flier owned by our club chairman. I was immediately impressed by its responsiveness and quietness in flight in comparison with other Rogallos I had flown (principally my Skyhook IIIA). Standard Rogallos mostly looked alike apart from colours and states of repair, but differing sailcloth, sail cut, amount of billow, varying flexibility and weight of tubing all resulted in noticeable differences in handling and performance.
Eipper-Formance of Torrance, California, also manufactured the Quiksilver semi rigid monoplane hang glider.
By the early 1980s the company that Eipper founded was the world’s largest manufacturer of powered ultralight aircraft. Creative people are often their own harshest critics and Eipper was an example…
When I met him a couple of years before he died, he introduced himself as Richard Eipper. I asked, “Well, are you Richard or Dick?” And he said, “Call me Richard. I was a Dick for enough years.”
— Veteran instructor Ken de Russy quoted by Peter Birren and Lori Allen, Hang Gliding, March 2000
See the Eipper-Formance of Torrance, California related topics menu.
In October 1975 Bill Liscomb filmed the flying at Torrey Pines with a hand-held movie camera aboard his Quicksilver C. See the link to YouTube under External links.
This topic continues in Hang gliding 1975 part 1.
1976 Kössen 1 de 3 15 min digitized film on YouTube by Roman Camps taken at the second world championship, Kössen, Austria, in 1976, starting at 13 minutes 31 seconds, where a Quicksilver launches
Colver Skysail & vario stuff on US Hawks Hang Gliding Association forum
Four-G test in a Wills Wing standard Rogallo in Bill Liscomb’s Big Blue Sky on YouTube starting at 42 minutes and 51 seconds. Narration is by Chris Wills, describing his late brother Bob.
Ken de Russy launching in a Wills Wing Swallowtail (white and yellow with dark tips) at Point Fermin: Wings of the Wind on YouTube starting at 21 minutes 50 seconds (very brief)
Hang Gliding at Point Fermin, 1976 digitized film on YouTube. Although film in 1976, I have it on this 1974 page to keep it with other Point Fermin material.
Point Fermin crash: Mike Harker – Courage Countdown – OLN -TV.wmv digitized film on YouTube by mikeharker1 starting at 1 minute 7 seconds, where Mike launches, loses control (looks like a stall), and hits the cliff…
Quicksilver landing on the beach at Point Fermin: Wings of the Wind on YouTube starting at 24 minutes 57 seconds
Torrey Pines aerial film shot by Bill Liscomb aboard a Quicksilver C on October 23rd 1975: Big Blue Sky on YouTube starting at 1 hour, 44 minutes and 52 seconds for the end credits
Torrey Pines aerial film shot by Bill Liscomb aboard a Quicksilver C on October 23rd 1975 (more, briefer): Big Blue Sky on YouTube starting at 1 hour, 11 minutes and 6 seconds. Narration is by Lloyd Licher, but it is not connected with this sequence.