Outboard motor setback bracket

[JPEROG]

Hydro Dynamics for a fixed plate or Porta for a hydraulic would be my suggestion. I have Porta brackets on every boat (he will design whatever you want for negative wedge into the bracket).

Joe

[jimmybrie]

Do you guys know if the material used for your bracket is 6061 or 7075 ?

[Onetime]

6061T6 is is what I used and most manufacturers use.

[Onetime]

Wouldn't you bolt the jackplate vertically on the transom and put the wedges between the jackplate & motor?
(Vance & Bob's both sell matching angled washers.)

Most jack plate manufacturers don’t want you to do this. You’re multiplying the loads on the jackplate considerably.

[David - WI]

Most jack plate manufacturers don’t want you to do this. You’re multiplying the loads on the jackplate considerably.

I wonder why? Even the 10 degree wedges only move the motor back 1-1/2"... less than going from an 8" to a 10" jackplate. The 5* wedges only add about 3/4".

[Onetime]

Maybe I misunderstood. He stated 12” of set back.
If you bolted the jackplate to the wedges and then bolted something to the jackplate to get to 12” is what I meant. Jackplate manufacturers don’t want that.

Best scenario is a custom made bracket to accommodate a vertical transom. One with a built in jackplate would be even better.

The Porta stuff is top notch!

[FUJIMO]

6061T6 is is what I used and most manufacturers use.

...yep...

[billy bilt]

All plate was 1/4' aluminum. inside of transom is same and runs forward 2' to main stringers. If I were to c change anything I would have extended to brackets at transom to extend above where cap meets hull. With 20" midsection wouldn't have to run jack plate all the way up to get sweet spot. My original plan was a 300XS but wife killed that one for smoke and noise. What kind of speeds are you seeing with your SHO?
as for condition...had a tree growing in it when I found it and a fair amount of fiberglass damage. Previous owner was not very handy.

[donmac]

Atlas

[jimmybrie]

Maybe I misunderstood. He stated 12” of set back.
If you bolted the jackplate to the wedges and then bolted something to the jackplate to get to 12” is what I meant. Jackplate manufacturers don’t want that.

Best scenario is a custom made bracket to accommodate a vertical transom. One with a built in jackplate would be even better.

The Porta stuff is top notch!

In fact yes, I wouldn't want the motor to hang 12" out of the jack plate. These motors are already so heavy compared to my previous 260.

Thanks for the porta link, I believe they do awesome work but I will probably build my own custom bracket and I wan't to keep my Bob's hydraulic jack.

[jimmybrie]

All plate was 1/4' aluminum. inside of transom is same and runs forward 2' to main stringers. If I were to c change anything I would have extended to brackets at transom to extend above where cap meets hull. With 20" midsection wouldn't have to run jack plate all the way up to get sweet spot. My original plan was a 300XS but wife killed that one for smoke and noise. What kind of speeds are you seeing with your SHO?
as for condition...had a tree growing in it when I found it and a fair amount of fiberglass damage. Previous owner was not very handy.

Congrats, you did a really great job on that restoration seems really neat! I also modified the inside brackets many years ago to distribute the load more on the rails. I will rework it even more when I'll work on the bracket. I will try to post picture next time I get the boat down (It's up on a lift for winter). My transom is a little bit warped by the bracket's load so I'll see what can be done there also. (but nothing to worry too much)

As for speed, I've only got the chance to test a couple hours at the end of last summer and my setup is far from optimal. But with everything stock I managed to get 97-98 @ 6200 with 2/3 full tanks, 2 in the boat and about 100lbs of stuffs in the boat. Wasn't able to jack much because no LWP.

Doing the cone, LWP and fatshaft right now (don't have much time so a little bit at a time) now so we'll see the difference. Will also do motor mounts (have them in stock but want to see the difference of every change)


But I heard guys around here goin 104-107 with Cougar + SHO

What do you get with the 300R? (really nice motor btw)

Also about plate thickness for the bracket by 1/4" I guess you were refering to the interior plates?. Outside bracket must be 1/2" and maybe 3/8" angles ?

Thank you

[JPEROG]

We have a guy running a 300R on a 21 Cougar. Best so far is 109, he is up 3 mph from the best his 300X ever ran and he says the boat isn't as weight sensitive. He has an 8" Porta bracket, ran a 12 with his 3L. Keep it level, we had another guy who had one running in the 110 area and we lost him. We didn't have the hp or weight when those boats were being designed.

Joe

[jimmybrie]

We have a guy running a 300R on a 21 Cougar. Best so far is 109, he is up 3 mph from the best his 300X ever ran and he the boat isn't as weight sensitive. He has an 8" Porta bracket, ran a 12 with his 3L. Keep it level, we had another guy who had one running in the 110 area and we lost him. We didn't have the hp or weight when those boats were being designed.

Joe

Oh! the 110 guy flipped!?

Yes leveled, that's why I want to save weight in the back, probably shorten the bracket (actually have 12" + 6" jack) and add little weight in the front to try and get back the balance I had with the 260. It sits lower in the water and I also get porpoising at 30 mph that I didn't have with my 260 setup which is sign of unbalance... Really have to rebalance that thing. Also actually running a Bravo FS (that's what I found handy for testing) and would be better with a stern lifting prop to help leveling again because of the natural lift of the hull. (Ran a humpback cleaver on my 260). That'S also why I stopped there because I needed to trim instead of jacking to get rpm's and I didn't felt safe going further. With the lwp I should be able to run more straight.

Lots of tuning to do still.

Thank you for your inputs

[JPEROG]

They tend to like flying bow high in order to dry the boat out. That lets most of the air lose contact with the deck Vs. flying it flat and evening out the pressure. Just makes me nervous. I know that John "the guy who passed away" played with his taking the windshield off and it was faster but scared him. The best propeller that he had was a thru hub 31 DeWald 4 blade 14 7/8 dia. with a short barrel. It was cut down to 1.25" from the blade roots. We had fun getting it set up. Just be careful.

I would highly recommend building your set back extensions out of 1/2" rather then 1/4" and making your mounting flange have the biggest footprint possible on the transom using 4 bolts per side minimum. Remember that motor wants to twist off the back really bad.

Joe

[jimmybrie]

They tend to like flying bow high in order to dry the boat out. That lets most of the air lose contact with the deck Vs. flying it flat and evening out the pressure. Just makes me nervous. I know that John "the guy who passed away" played with his taking the windshield off and it was faster but scared him. The best propeller that he had was a thru hub 31 DeWald 4 blade 14 7/8 dia. with a short barrel. It was cut down to 1.25" from the blade roots. We had fun getting it set up. Just be careful.

I would highly recommend building your set back extensions out of 1/2" rather then 1/4" and making your mounting flange have the biggest footprint possible on the transom using 4 bolts per side minimum. Remember that motor wants to twist off the back really bad.

Joe

Ok John didn't passed away because he had an accident with his boat?

Yes 1/4" wasn't even a question for the bracket, 1/2" it will be I was just wondering about the angles if I would go 3/8". 1/4" for inside rienforcement plates might be acceptable (That's what I have right now)

I will also try to maximise the footprint on the transom for sure. I already have 4 bolts on each side but the footprint is not optimal.

So the guy yo know that runs good has cut 4" to the setback from the 300x to the 300R? 12" to 8" + jackplate?

Thanks again for your input