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Maryland team readies Gamera II for next human-powered helicopter record

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June 15, 2012

The Gamera human-powered helicopter team at the University of Maryland's Clark School of E...

The Gamera human-powered helicopter team at the University of Maryland's Clark School of Engineering has announced the first test flights of a redesigned craft which is hoped will smash existing records and claim the elusive Sikorsky Prize.

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Last July, the frantic pumping of upper and lower limbs of intrepid pilot Judy Wexler managed to keep the huge Gamera human-powered helicopter in the air for a record-breaking 11.4 seconds. The student team from the Alfred Gessow Rotorcraft Center at the University of Maryland's Department of Aerospace Engineering has since been busy refining and redesigning the craft for another stab at the elusive US$250,000 American Helicopter Society's Sikorsky Prize. Gamera II has been built for longer flight duration and is lighter and tougher than its predecessor, with improved transmission and enhanced rotor design. The new x-shaped craft is set to take off next week for its first test runs and the team is confident that existing record times will be smashed... but will it nab the ultimate prize?

Gamera II is reported to be a good deal lighter than its predecessor, with the team managing to shave off 35 pounds (15.8 kg) to give it a total weight of just 71 pounds (32.2 kg). The large x-shaped frame has still been constructed using the micro-truss structures developed for the original quad-rotor craft, but have been employed more extensively throughout the frame. At the end of each point of the cross is a new enhanced rotor blade, designed with the help of custom-built optimization software. An increased taper ratio is said to have improved aerodynamics and root stiffness of the blade spar, which results in increased ground effect and keeps tip deflections low.

Cockpit core structure containing the hand and foot cranks

The engine at the heart of Gamera II is the human pilot, and this year three pilots will man the hand and foot cranks of the redesigned cockpit. The team comprises amateur bike race and assistant research scientist in the University of Maryland Department of Astronomy Dennis Bodewits, alternate pilot for the first Gamera and Ph.D candidate in Clark School's mechanical engineering department Kyle Gluesenkamp, and keen cyclist Colin Gore, who is also a Ph.D candidate but in the School's materials science and engineering department, and was another alternate pilot for the original craft. They're all in the same weight range of 135 - 145 pounds (61.2 - 65.7 kg) and reportedly have (and will need) excellent power to weight ratios.

The team fully expect Gamera II to remain in the air for more than the 60 seconds required to meet the first exacting criteria of the Sikorsky Prize, and has recently been using a test rig to explore the power needed to achieve an altitude of 3 meters (9.84 feet) above the ground at some point during the flight.

The following teaser video has been released ahead of next week's test runs:

More attempts are scheduled to take place in August. We'll be keeping an eye on the progress of Gamera II and will keep you updated.

Source: Gamera Human-Powered Helicopter Project

About the Author
Paul Ridden While Paul is loath to reveal his age, he will admit to cutting his IT teeth on a TRS-80 (although he won't say which version). An obsessive fascination with computer technology blossomed from hobby into career before the desire for sunnier climes saw him wave a fond farewell to his native Blighty in favor of Bordeaux, France. He's now a dedicated newshound pursuing the latest bleeding edge tech for Gizmag.   All articles by Paul Ridden
3 Comments

They need to get somebody from the athletics department to fly it, a sprinter or power lifter.

Slowburn
18th June, 2012 @ 05:55 pm PDT

The problem with this construction is that the rythmic moves of the bicyclist will resonate through the beams and tear it apart, that alone was good enough reason for the brothers Wright, to opt for an engine, not human power.I hope it won't rain during the test days.

jochair
19th June, 2012 @ 10:06 pm PDT

Change the applied power to stored power. instead of direct transmission of power by cyclists - like a bike - use the cyclists to load torque into a spring. Gearing should be multiplying power for spring like a wind up toy or music box. once spring 1 is loaded with sufficient power it will release steady, even rpm, and cyclist can begin loading spring 2 with power. gear down into spring, instead of up and let the loaded power gear up blades. just a thought. from a carpenter.

Christian Lincoln
14th October, 2012 @ 06:00 am PDT
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