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David Ullman

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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

Completions

Builders share their successes.

Letters

 Bivalve Solution?Studying your article on fuel systems “Keep it simple. Keep it safe.” ,...

Wind Tunnel

This month Barnaby Wainfan turns his attention to the control system and how various aspects such as linkages, the elevator planform and tail aspect ratio, and trailing-edge treatments affect pitch control.

Vacuum Bagging for Homebuilders

Pleats, punctures and vacuum loss, oh my! Patrick Thomson addresses all of these potential problems and more in the last installment of his series on vacuum bagging at home.