Bob Wilder owns the new world record for longest-duration indoor flight with a radio-controlled electric airplane. It stayed aloft for 4 hrs, 17 min, and 57 sec.
Wilder says it is important to perform tests to find the maximum thrust using the minimum current draw from the batteries. So he analyzed many combinations of motors, gear ratios, propellers, and batteries. "The real bottom line in producing an airplane that will fly inside for several hours is thrust versus current draw," he says. "That means the size of the battery and the size and efficiency of the motor are key."
Wilder uses a permanent magnet motor from Maxon Precision Motors (Burlingame, CA). He claims that the company's coreless motors provide the low-current consumption needed for extending battery life in competition. The motor's iron-less core eliminates cogging and provides smooth rotation even at the lower speeds required for landings.
For more information about motors from Maxon Precision Motors: Enter 539
This slideshow includes several versions of multi-materials machines, two different composites processes including one at microscale, and two vastly different metals processes. Potential game-changers down the line include three microscale processes.
Hosted CAD or PDM systems is an emerging technology that offers many advantages over traditional on premise workstation CAD configurations and is making many companies rethink how to deliver future CAD software solutions.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.