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
United Launch Alliance will fly 3D-printed flight hardeware parts on its rockets starting next year with the Atlas V. The company's Vulcan next-gen launch vehicle will have more than 100 production parts made with 3D printing. The main driver? Parts consolidation and 57% lower production costs.
The new small-form-factor EZ-BLE PRoC (Programmable Radio on Chip) module is a derivative of the existing PRoC BLE Programmable Radio-on-Chip solution. The EZ-BLE PRoC module integrates the programmability and ARM Cortex-M0 core of the PRoC BLE, two crystals, an onboard chip antenna, a metal shield, and passive components.
The engineers and inventors of the post WWII period turned their attention to advancements in electronics, communication, and entertainment. Breakthrough inventions range from LEGOs and computer gaming to the integrated circuit and Ethernet -- a range of advancements that have little in common except they changed our lives.
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.