Home Authors Posts by David Ullman

David Ullman

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

The Dawn Patrol

Built in to any aircraft construction project is time for head scratching and trying to recall why you just walked from one end of the shop to the other. These are some of the most valuable moments.

Experimotive

Bud Warrens Geared Drives has entered the firewall-forward business with promising results thanks to a new PSRU. By Rick Lindstrom.

Ask the DAR

Mel Asberry clarifies the requirements for a builders log. The bottom line? The requirements are minimal: It should show that you actually built the aircraft, but its helpful to show as much detail as you can. And make sure you're in the photos, doing the work.

Build a Calibrated Tensiometer

An accurate, inexpensive, cable gauge thats easy to make.