DIY static outboard bracket

[peiserma]

I've seen that one on several sites. I have never seen a weight rating for it, only a HP rating (150, which the motor exceeds). I would think the weight capacity is important, I personally can't bring myself to trust it until I know.

[smokeonthewater]

whoops!.. I was thinkin you were getting a 150.... my bad

[reelapeelin]

Originally Posted by peiserma

I've seen that one on several sites. I have never seen a weight rating for it, only a HP rating (150, which the motor exceeds). I would think the weight capacity is important, I personally can't bring myself to trust it until I know.

Check out the specs on that bracket...what thickness material..alum or SS...how many bolts and exceed those numbers for your 175

[garagenc]

Here's my 2 cents worth:

Any Stainless angle over 3" x 3" x 3/8" for outside, Inside I would use a full plate 1/4" thk across the transom to disburse the force on the transom. The plate should be a minimum of 4" larger than the distance across and above the outside area of the angle frame dimension. Bolts 5/16" dia minimum 2" down/inside from each end and then spaces about every 8" apart. Grind the extreme ends of the angle where they lay against the transom. All welds should be full penetration for the bracket and ground smooth on the side against the boat. This will not allow any brunt force against the fiberglass.

Do not use aluminum, you would need to beef up the thickness from 5/16 to 1/2" thick to compensate for strength and it would need to be out of billet aluminum.

[spareparts]

remember also, you need lift, not necessarily set back, although set back requires less lift(rule of thumb is 2 inches set back covers one inch lift), I made a lift only bracket for a 70 by using two pieces of angle aluminum, I used the original mounting holes in the transom to mount the aluminum angle use flat head bolts so they fit flush), and drilled new holes thru the angle and transom for the engine mounting bolts. The top bolts were not supported by the transom, they only went thru the angle, the bottom bolts went thru the angle and hte transom

[peiserma]

Originally Posted by spareparts

remember also, you need lift, not necessarily set back, although set back requires less lift(rule of thumb is 2 inches set back covers one inch lift)

I'm confused by that statement. If the transom is angled down towards the water, wouldn't the setback due to the bracket require more lift, not less?

[phatdaddy]

water is "higher" the further back from the transom you go. the deepest hole your boat makes in the water is at the transom.

now your really confused

[peiserma]

Ah! Now I get it. I wasn't considering the most important part, and that is the boat moving forward on plane... Thanks for clearing that up. Of course that makes it a little tougher to deterimine how high the motor needs to go.

Maybe its better to just buy an adjustable bracket for that reason alone? If i don't get it right the first time, I need two more SS angles.

[garbubba]

I think you are going to have trouble if you mix metals unless you can insulate that aluminum plate from the stainless angle, the plate will act like a sacrificial anode to the bracket, especially in saltwater.

[spareparts]

Originally Posted by spareparts

remember also, you need lift, not necessarily set back, although set back requires less lift(rule of thumb is 2 inches set back covers one inch lift), I made a lift only bracket for a 70 by using two pieces of angle aluminum, I used the original mounting holes in the transom to mount the aluminum angle use flat head bolts so they fit flush), and drilled new holes thru the angle and transom for the engine mounting bolts. The top bolts were not supported by the transom, they only went thru the angle, the bottom bolts went thru the angle and hte transom

sorry, I did word that screwed up, Smoke explained it better than I did, you get the idea. The further you go back, the higher you can run the engine