Background of Old O S Max 61 Engine
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OS Max 61 converted to pure diesel engine.
Return of the OS .61 - mothballed for 25 years
OS Max 61SF Long Stroke Test from Trash to Treasure
Motor OS Max 61
Engine Talk Episode 42 Comparing OS 60/61 FSR's
OS MAX SF61 Long Stroke Test 15x7 Prop
OS MAX 61FSR, 80% METANOL 20% CASTOR, GRAUPNER 11X7 1/2
MA X-Cell 60 OS Max SF .61
Old OS 61SF first run
OS MAX .61 FSR Special Edition
Super Hotts OS MAX 61 SF Charles County Radio Control
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Last Updated: August 24, 2026
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