Howard
Well-known member
Thanks Rich, buying a used motor is a roll of the dice and this one runs so well. This was given to me by my nephew so probally looking at cutting transom.
ditchen said:Another piece of info you need when mounting a jack plate. A rough baseline is for every 1" of set back the motor height should be 1/2" higher. So if you use a set back of 6", ventilation plate should be approx 3" above the keel.
That is usually a good baseline to start. Application and total package combo will vary.
truckhuntfish said:looks nice clark , would you trust a 30 hp motor on that ?
Pappy said:ditchen said:Another piece of info you need when mounting a jack plate. A rough baseline is for every 1" of set back the motor height should be 1/2" higher. So if you use a set back of 6", ventilation plate should be approx 3" above the keel.
That is usually a good baseline to start. Application and total package combo will vary.
Not necessarily! That "standard" started when plates were used mainly on faster deep V hulls (the old Gil brackets) and spread to the Bass market where the engines had specialized propellers and water pick-ups. Way not true on a small flat bottomed aluminum hull that may have an engine with a water pick-up at the rear bottom of the cavitaion plate or a more modern one on the side of the gearcase and well below the cav plate. These boats have no chance of airing out and running bow high like on a built in pad bottom or a 24 degree deadrise offshore hull. All rules do not apply on all boats and engines all the time. Even the 15" designation on a short shaft engine or a standard 20" is all over the place from manufacturer to manufacturer. You may find an inch or more difference between John son/Evinrude/Merc/Yamaha/Suziki/Nissan/Tohatsu, etc.
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