Ship Shape TV

[Scott]

What is the equation for the setback verses the height?

Is it raise the motor a 1/2 inch for every inch of setback?
So for a 30" set back the motor would be 15" higher??? I'm confused??? [img]/images/graemlins/confused.gif[/img]

½ inch for every inch setback ??? that’s a problem [img]/images/graemlins/shocked.gif[/img] …are you sure it wasn’t a foot?

What I've been told by a couple different builders (using Stainless brackets )was 3-5 inches to start …….1-2” rise for every foot of setback…..so to average it for a 30” set back …2.5 x 1.5 = 3 ¾ “ rise ( but I'm guessing the amount of rise changes with every hull out there) This is a ballpark ... then adjusted up/down once the boat is sea trialed

I also believe this is how you get the shallower running drafts ….. not the that bracket is physically lifting the stern of the boat out of the water ( remember chances are that the bracket buoyancy gets cancelled out when the engine gets mounted anyway and conversely canceling the effects of the engine/s weight)… but rather the engines draft is less due to the higher mounting position as opposed to where it would be when mounted on a notched transom.

I don’t know how this works with Seamark ….as we know the bottom of that bracket follows the same plane as the hull ….. Unlike the Armstrong (although I have seen the Armstrong shape change) or the Stainless that angle up towards the motor mount

I don’t know how that effects the flow of water aft of the transom when it meets the brackets floatation chamber ….. I thought in one of my conversations with Don that the bottom of the bracket is mounted 3-4 inches higher than the bottom of the SeaCraft 23 hull...I'm assuming the Seamark was designed around the 23 SeaCraft