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Jonathan Welsh

Jonathan Welsh
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The 160 hp turbocharged Rotax 916iS is a four-stroke piston engine with redundant electronic fuel injection and ignition. [Credit: BPR Rotax]

2026 Engine Buyer’s Guide

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Our annual survey of the wide array of engine options available to homebuilders, from certified to experimental.

In Case You Missed It

Letters

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Ignition AdvanceRegarding Nigel Speedy's article , I had a friend doing a similar experiment...

Take a Lap!

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Exhaust valve lapping, in place!

Old, New & Old Again!

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We are seeing more talk of people rebuilding cores found in barns or the back of hangars.

Easy Slider: Part 2

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Preparing a fiberglass canopy skirt and windshield fairing for prime time.