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Decades later, I'm still waiting for jetpack technology to get off the ground. The jetpack may have failed to fulfill its promise, but it wasn't for lack of trying. From top: the WASP II; the Bell Aerosystems Rocket Belt; the pogo, also by Bell Aerosystems; Sean Connery as James Bond in the 1965 film "Thunderball," the apogee of jetpack chic. Bond: Photograph from Photofest. stunning array of technological innovations has been woven into the day-to-day fabric of early-21st-century life: clothing made from recycled plastic Coke bottles; phones that run on high-frequency microwave radiation; snack-food science capable of containing such unruly forms as s'mores and peanut butter and jelly within the confines of a toaster pastry. Yet for some of us, such marvels are slim compensation for the unrealized possibilities of another device, one promised throughout childhood and never delivered. Where are our jetpacks? The iconography of the jetpack -- a rocket-powered backpack offering its user the power of solo flight -- stretches back to Buck Rogers comic strips of the late 1920's and recurs in Walt Disney's 1950's Tomorrowland, James Bond's gadget-filled films and the skyways of the city where the Jetsons make their home.

By the early 1960's, the jetpack was such a familiar pop-culture image that it had become interchangeable with the very idea of the future -- to mention one was to invoke the other. Yet still we find ourselves, in the year 2000, traveling by conveyances of the last century rather than soaring happily above the treetops. The United States Army called them small rocket lift devices and began financing their development in the 1950's, intending to use them for amphibious troop landings, reconnaissance missions and passage over hazardous terrain. targus backpack cvr600Early versions were ballyhooed, including Thiokol's Jump Belt and Aerojet-General's Aeropak, but the first major success was achieved in 1961, at Bell Aerosystems in Buffalo. f stop tilopa bc backpackThe Rocket Belt, designed by engineer Wendell F. Moore, was a kind of hard-frame backpack powered by two hydrogen-peroxide fuel tanks (with long exhaust pipes trailing off on either side of the wearer) and controlled with motorcycle-like handgrips. backpack na2

Flying in a standing position, with knees slightly bent, users could achieve speeds of up to 60 miles an hour. One test pilot described the experience as "having a giant pick you up by the arms." But it wasn't very practical for wartime use: the pack was heavy; in flight it made a loud screeching noise; and fuel capacity limited the flight time to just over 20 seconds. So after demonstrating it for the military, Bell started flogging it at state fairs, Disneyland, the Paris Air Show and numerous international exhibitions, ultimately hiring it out for the opening sequence of "Thunderball," a commercial for P. F. Flyers sneakers and episodes of "Lost in Space" and "Bewitched." Further refinements yielded the Flying Chair (1965), which mounted a Rocket Belt apparatus on one of Eero Saarinen's stylish Tulip chairs, and the Pogo (1968), which put the device on a flying platform. In 1968 Bell, in collaboration with the Michigan-based contractor Williams Research Corporation, unveiled the Jet Belt, which used a miniature kerosene-powered jet engine.

This device could accelerate to 70 m.p.h. from a hovering position in three seconds and was capable of sustained flight for 10 minutes. A test pilot told Popular Science magazine that the Jet Belt made him "feel safer than I do driving the family car in traffic." Of course, the jet engine was tremendously heavy and nearly deafening, but hopes for it were high. A year later, however, Wendell Moore, still the device's chief engineer, died of a heart attack. Subsequently the military declined to commission mass production of the Jet Belt, and in early 1970, Bell Aerosystems sold all related patents to Williams. At Williams, the Jet Belt's engine became the centerpiece of the WASP, or Williams Aerial Systems Platform. Developed in two stages over the next 15 years, the WASP II was a 250-pound cylindrical tub resembling a flying garbage can. Hard as it is to believe, it could fly at speeds up to 60 m.p.h. for as long as 30 minutes. The WASP II was featured in Jane's All the World's Aircraft as late as the 1984-1985 edition, but again the army, which had financed its development, lost interest.

Further attempts by Williams to market it under the name X-Jet failed, and then . . . nothing. No more test flights, and a subsequent abandonment of individual flight systems. Today the company is curiously reticent on the subject: though jetpack fanatics continue to call with inquiries on a regular basis, a spokesman for Williams dismisses the issue as something from "the very old past." Several years ago, Derwin M. Beushausen, an enthusiast from the Midwest, distributed a videotape of short films made by Bell that documented test flights of the Rocket Belt, Flying Chair, Pogo and Jet Belt. Like people Jet Skiing through the sky, Bell's implacable fliers slalom effortlessly through and over trees, zoom across whitecapped river rapids, whip alongside steep cliffs, float above warehouse roofs and hover over a lawn, turning slow rotations for a group of military observers. They are among the most thrilling, and also heartbreaking, images I've ever seen. I sit watching the tape and think only: Why?

Why can't I fly one of those things? "Jetpacks?" asks Frank Winter, curator of rocketry at the National Air and Space Museum. "I think here we call them Personal Lifting Devices," he says. The museum owns the Bell Aerosystems Rocket Belt No. 2, which is slated for display at the Dulles Center, in conjunction with the Smithsonian, scheduled to open in the year 2003. "People still call me about them every so often, but you know it was a commercial failure. It wasn't a practical reconnaissance device." Winter must sense how crestfallen I am. "It really was ingenious," he adds. "I'm not knocking it. You know, it's too bad that it wasn't picked up." These days, the only new jetpacks are the ones worn by astronauts. NASA calls them M.M.U.'s, or manned maneuvering units: worn in a backpack configuration similar to the Rocket Belt, they use nitrogen fuel to propel and guide movement during spacewalk activity. In the earth's gravity, however, M.M.U.'s would be far too weak to function.

Rocket Belts, with their 20-second flight duration, are still used for show-business purposes; memorably, in 1984, millions watching the opening ceremonies of the summer Olympic Games witnessed a former Bell pilot, Bill Suitor, descending into the Los Angeles Coliseum, trailing clouds of white exhaust behind him. But all of the subsequent research and development has seemingly been for naught. A note sent to me by Williams tersely explains that testing of the X-Jet was stopped when they concluded that "in order to make feasible more useful applications, [it] would require substantially improved performance from its turbofan engine." Winter agrees: "Even 30 minutes of flight time would be too limited for commercial purposes. If you're a park ranger, fighting a fire, what if you need 35 minutes, or two hours?" Still, he concedes that "if the right entrepreneur came along, it could be a neat attraction. We may not be looking at the last chapter with this sort of device." So where are our jetpacks?