David Ullman
Vortex Generators for Cooling
A simple fix reduced CHTs in a Velocity by 55 degrees. By David G. Ullman.
Hear the Hum?
Whats the buzz? David Ullman looks at the past, present and future of the electric airplane.
Electric Dreams Prevail at the CAFE Aircraft Symposium
Among the topics covered at the third annual Electric Aircraft Symposium were climate science, battery and motor technology, and aircraft designs, both real and imagined.
In Case You Missed it
Ray Stits Remembered
Designer of 15 Experimentals, inventor of the Poly-Fiber covering system, and founder of EAA Chapter 1, he was an aviation ambassador for all. By Amy Laboda.
Cover Story: Building a Custom Cushion
Learn how to measure, cut and assemble the foam pieces that constitute the seat cushion.
Practical Electrical
Battery facts and fables for the aircraft builder–part 2. By Robert L. Nuckolls, III.