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John Christian

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Round-Engine Revival

A visit to Verner Motor in the Czech Republic. By John Christian.

In Case You Missed it

Poka-Yoke Cable Clamp

From a machinist’s point of view, the clamp couldn’t be simpler: A couple of grooves, some bolt holes and you’re done.

Letters

Adding an O2 Sensor Reinhard Metz's article about adding an AFR gauge and O2 sensor...

Aero ‘lectrics

Jim Weir presses the venerable LM317 variable voltage regulator (plus a few other parts) into service as a way to juice up a discharged battery.

2013 Kit Aircraft Buyer’s Guide

Here’s a look at the newest designs and how the kit aircraft segment of Experimental aviation has changed over the past year. By Mary Bernard and Suzanne B. Bopp.