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Langley R. Muir

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SPOT, Checked

Navigation expert Langley R. Muir, Ph.D.s in-depth study of the SPOT Personal Tracker reveals its capabilities…and what you need to know to use it most effectively.

In Case You Missed it

Aero ‘lectrics

Jim Weir takes a look at low-cost and free CAD software available to help you document modifications you've made to your aircraft.

Down to Earth

When an aircraft engine is tightly cowled without cowl flaps, running hot can be a problem. But there are solutions, as author Amy Laboda found out after much research and experimentation.

Pole to Pole!

Around the world over both poles (part 2).

Ask the DAR

Mel Asberry answers readers’ questions on one-off engineering data requirements, how to fill out an AC 20-27G form, and how to test-fly an aircraft in the U.S. Virgin Islands.