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Magneto Test Bench

Magneto Test Bench. Thompson Aircraft Maintenance San Luis Obispo, California. Magnetos 101. Magnetos are old technology On cars were replaced by coil ignition system Simple system Engine driven Magnetos keep generating spark even if lose electrical system Trouble-free.

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Magneto Test Bench

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  1. Magneto Test Bench Thompson Aircraft Maintenance San Luis Obispo, California Magneto Test Bench

  2. Magnetos 101 • Magnetos are old technology • On cars were replaced by coil ignition system • Simple system • Engine driven • Magnetos keep generating spark even if lose electrical system • Trouble-free Magneto Test Bench

  3. Aircraft Engines 101 • Air cooled • 4 or 6 cylinder • “Boxer” engine • Doubly-redundant magneto ignition system • Each magneto generates spark for all four cylinders Magneto Test Bench

  4. Magneto Installations Magnetos on back side of engine. Notice four spark leads coming from magneto. Dual mags on six-cylinder twin engine plane. Magneto Test Bench

  5. Magnetos Up Close Engine side of mag shows gear drive. Different make mags have different drives. Lead side of mag shows spark lead connections. Magneto Test Bench

  6. Manually Testing Mags Current test procedure is manual and subjective. Spin mag drive and look at spark. Qualitatively assess strength of spark. Spark test leads for magneto tester Spin drive gear manually And observe spark strength Magneto Test Bench

  7. Magneto Test Bench • Want to make testing more quantitative • Want to drive mag with a motor at various speeds (0-2800 RPM) • Want to be able to measure voltage at spark leads • Want to be able to accommodate mags of different makes (Bendix, Slick, etc.) • Want to be able to accommodate 4- and 6-cylinder engines • Want to be able to drive different mags with motor • Want to be able to observe spark also Magneto Test Bench

  8. Magneto Test Bench • Make test bench out of off-the-shelf components • 80-20 structural pieces, e.g. • Standard motor and measuring equipment from McMaster-Carr, e.g. • Inexpensive Magneto Test Bench

  9. Contact Information Cody Thompson, A&P, IA, 471-1119 Magneto Test Bench

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