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The mechanical arm mechanical arm with a miniature rocket motor can lift (curl) about 20 to 25 pounds, three to four times more than current commercial arms, and can do so three to four times faster.
Goldfarb?s power source is about the size of a pencil and contains a special catalyst that causes hydrogen peroxide to burn produce pure steam which is used to open and close a series of valves.The valves are connected to the spring-loaded joints by belts made of a special monofilament used in appliance handles and aircraft parts and a small sealed canister of hydrogen peroxide that easily fits in the upper arm can provide enough energy to power the device for 18 hours of normal activity.By covering the hottest parts with special insulating plastic, they were able to reduce surface temperatures enough so they are safe to touch and the steam exhaust is vented through a porous cover, where it evaporates like natural perspiration.