New procedure for launching passenger rockets


June 17, 2005

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June 18, 2005 Three weeks of flight tests over the Mojave desert have demonstrated a breakthrough in how to safely launch future passenger-carrying rockets using a carrier aircraft. Transformational Space Corp. (t/Space) and Burt Rutan's Scaled Composites drop-tested dummy boosters from an aircraft using a technique that caused them to rotate towards vertical without requiring wings. This allows an aft-crossing trajectory in which the rocket crosses behind the aircraft, greatly enhancing safety. Previous air-launched rockets such as the X-15, Pegasus and SpaceShipOne crossed in front of the carrier aircraft using wings to turn themselves from horizontal flight to the vertical position needed to achieve orbit. In addition to greatly enhancing safety, eliminating the weight of wings increases the payload the rocket can take to orbit.

The innovation developed by t/Space is a special mechanism that holds on to the nose of the booster for about a half-second after the center of the rocket is released. This slight tug on the nose starts the booster rotating as it drops. A small parachute on the rocket's nozzle ensures the rotation happens slowly.

The dummy booster dropped today was the third and final in the t/Space program, with previous drops on May 24 and June 7. All test articles dropped were inert -- two steel tanks welded together with a Fiberglas nose and nozzle. They were 23% of the size of the actual rockets to be developed for sending a four-person capsule into orbit. Since they had no engines, each eventually crashed onto the dry Cuddeback Lake, about 35 miles northeast of Mojave, CA. The wreckage was collected and removed.

t/Space is one of eight companies funded by NASA's Exploration Systems Mission Directorate to develop concepts for the agency's Crew Exploration Vehicle (CEV) that will take over non-cargo duties from the Space Shuttle. NASA agreed to let t/Space use some of its US$3 million second-phase study money to build and test hardware in addition to conducting analytical studies. The successful drop test program shows that small companies using rapid prototyping can deliver new hardware very rapidly.

"We went from brainstorm to booster drop in just 135 days," said David Gump, president of t/Space. "Program manager Marti Sarigul-Klijn proved that his computer simulations were dead-on correct each time the aircraft dropped the dummy booster."

Bob Morgan managed the Scaled Composites side of the test program that demonstrated the new air launch method, called Trapeze-Lanyard Air Drop (t/LAD) launch. This approach greatly improves simplicity, safety, cost, and reliability of launching personnel into low Earth orbit.

About the Author
Mike Hanlon Mike grew up thinking he would become a mathematician, accidentally started motorcycle racing, got a job writing road tests for a motorcycle magazine while at university, and became a writer. As a travelling photojournalist during his early career, his work was published in a dozen languages across 20+ countries. He went on to edit or manage over 50 print publications, with target audiences ranging from pensioners to plumbers, many different sports, many car and motorcycle magazines, with many more in the fields of communication - narrow subject magazines on topics such as advertising, marketing, visual communications, design, presentation and direct marketing. Then came the internet and Mike managed internet projects for Australia's largest multimedia company, (Australia's largest Telco), (Australia's largest employment site),,, and a dozen other internet start-ups before founding Gizmag in 2002. Now he writes and thinks. All articles by Mike Hanlon
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