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So far in Jim Weirs investigation of digital logic, hes explored small scale integration. This time, its time to ramp it up a bit and use some medium scale integration devices that will remember your settings.

As Light Sport Aircraft become more popular, so too will the desire to learn more about maintaining one of the most common engines used in these designs, the Rotax four-strokes. Columnist Dave Martin goes back to school to learn about routine Rotax maintenance as well as safe operation of the popular engine.

Quickbuild kits too easy? Here's your next project.

An RV builder begins our journey through the gritty details of working with metal.