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Recently purchased a great 1984 18' Outrage without power with t-top. Minimum recommended is 70 hp 25" shaft. Had a recently purchased leftover 2004 Yamaha 50 hp High Thrust with a 21" shaft. Decided to give it a chance since it was sitting around and after spending some time calculating Whaler hull forms, weights, and expected top speeds with different hps. With a black stainless 13 1/2 x 14 prop and full 64 gallons of fuel the boats performance far exceeds my expectations. Quick to get up on plane and easily cruises at 22 mph a bit over half throttle, top end is close to 30. The slightly longer High Thrust shaft on the T50TLR, larger gearcase with lower gearing and larger diameter prop seem to get the necessary bite in the water and only get some cavitation if sharply turning without lowering power setting. Added benefit of the shorter shaft is reduced drag and draft. After getting my tach installed and do some mpg calculations will share that information if ya'll are interested.