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Engineering Masterpiece – Vintage model soars with a scratch-built diesel engine

Jim Mullner in the workshop with his Tomboy, which is powered by his scratch-built 1cc Weaver diesel engine.
Jim Mullner started his RC aviation journey building foam-board electric-powered models a few years ago. But his passion for craftsmanship didn’t stop there—he wanted to take things up a notch. Over the past two years, he expanded his model workshop to include metal machining equipment, a lathe, and a vertical boring mill. With these new tools in hand, Jim embarked on an ambitious project: building a replica vintage diesel engine and mounting it on a...

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