ContinuousWave   Whaler   Moderated Discussion Areas   ContinuousWave: Whaler Performance   1961 13 STANDARD Engine Shaft Length
 Author Topic:   1961 13 STANDARD Engine Shaft Length 19snooky63 posted 01-15-2015 05:24 AM ET (US)         [Some dimension of the] transom [of a 1961 Boston Whaler 13-foot STANDARD boat] is 17-inch. The anti-ventilation plate of the recommended short shaft or 15-inch shaft outboard will be 2-inch above keel. Will this affect performance? I am getting a 25-HP. Thanks. macfam posted 01-15-2015 06:35 AM ET (US)             That's about right. You want the anti-ventilation plate ABOVE the keel, never equal to, or below. The best performance and control, and least porpoising occurs when plate is 1-inch to 2-inch above the keel. jimh posted 01-15-2015 09:48 AM ET (US)             The transom of the older Boston Whaler boats is designed for outboard engines with a short shaft or 15-inch shaft. There really is not any particular dimension on the transom that is supposed to be precisely 15-inches.Having an outboard engine with the wrong shaft length affects performance. dg22 posted 01-15-2015 10:45 AM ET (US)             When measuring the transom, you need to take a vertical measurement. It should be closer to 15 inch. jimh posted 01-15-2015 11:38 AM ET (US)             The vertical height will be shorter, but it won't be 15-inches on a transom of 17-inch height with the usual transom angle of around 13-degrees. It will be more like 16.5.The trigonometry will bevertical height = COS(transomAngle) x (transom height)vertical height = COS(13) x 17vertical height = 16.56 dg22 posted 01-15-2015 03:29 PM ET (US)             I read a post here that the actual transom angle of the 13-footer is 20-degrees. I borrowed my daughter's calculator and this works out to a vertical height of 16 inches using the formula Jimh provided. If I remember correctly that is close to what I measured a few years back. 19snooky63 posted 01-15-2015 05:39 PM ET (US)             thanx a lot folks you were realy helpful,i,m doing a total redo outside is buffed out,inside is blocked to 220,shold buff it out this weekend,came with orig brass and stainless,will post pics if I can fig it out,thanx again.

 Hop to: ContinuousWave: The Whaler GAM or General AreaContinuousWave: Whaler MarketplaceContinuousWave: Whaler Repairs/ModsContinuousWave: Whaler PerformanceContinuousWave: Small Boat ElectricalContinuousWave: Trips and Rendezvous