Sampson Boat Co · video

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The 46-foot wooden gaff cutter *Tally Ho* suffers from an over-propped engine, preventing the motor from reaching its rated 2,800 RPM.1:22 Initial sea trials showed the engine stalling at 2,000 RPM due to excessive propeller pitch.1:22 A diver adjusted the VariProp blades to reduce resistance, but the engine failed to reach full revolutions during a second sea trial.12:24 During this test, the vessel briefly ran aground in shallow harbor mud at low tide, sustaining no damage.9:09 Subsequent investigation revealed a fundamental mismatch in the drivetrain: the installed gearbox features a 2:1 reduction ratio instead of the planned 2.5:1 ratio.19:59 This discrepancy forces the propeller to spin faster than intended, creating excessive load.20:15 The crew must now choose between replacing the gearbox or installing a smaller propeller to resolve the issue.20:51 Separately, the crew installed bow and stern mushroom vents to improve airflow and calibrated the black water holding tank using a Tank Tender manual pump system.15:00

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