*** 23' Sceptre / Tsunami Engine Height Set Up *** How High

[GameOnSalmon]

Originally Posted by Bushwacker

I think you'll need to be quite a bit higher if bracket setback is 29". Not sure how much this applies to a 23, but I've found that the "raise motor 1" for every foot of setback" rule-of-thumb that's often quoted for brackets is WAY too conservative for my 20! Optimum motor height per BRP is when the AV plate is above green water when you're up on plane and fully trimmed out. Picture below shows the AV plate on my 25" motor at 3.5" above keel BEFORE I had Don Herman redrill the motor mount holes on the bracket to raise it about another inch! And it's STILL too low! Needs to come up another inch for top of AV plate to be above green water, so that would put me somewhere around 5-5.5"! I have to admit that I only picked up about 50 rpm and 0.5 mph with the last raise so another inch might not make much difference, but I'm sort of a perfectionist when it comes to engine performance, so it kinda bugs me if there is any more splash and drag than necessary!

Bushwhacker your exactly right... with the Setback I have used 3.5" on a 30 Inch Bracket... Since i have not launched my Tsunami Yet... Just picked up the Engine Tonight for it... My Bracket is mounted at 28" then i see these Seacrafts like another 1.5 to 2.5 inches to run... Then the AV plate can be raised even more... Basically until it Blows out then down One Hole... with that being said...

I just got my hands on a Land and Sea Electric 4" Jackplate to place onto my Bracket...then the motor. I am going to just set it up in the 2nd from the bottom hole basically up 2" then i will have the The opportunity to run it up another 6 inches once on plane. Drilling and Installing Water Pressure gauge as we speak...

Really Appreciate the input... Want to just get this close the first time.

Regards,
Robert

[eggsuckindog]

My Stilletto is 2 1/2+ had it up another hole which would have put it at 3" but lost some trim response but it didn't cavatate, they like the higher the better. You would need a 17 they are hard to swing

[GameOnSalmon]

Originally Posted by eggsuckindog

My Stilletto is 2 1/2+ had it up another hole which would have put it at 3" but lost some trim response but it didn't cavatate, they like the higher the better. You would need a 17 they are hard to swing

Dog... It's a Johnson 225 1986 .. the 2.7 liter.

So are you thinking i can run 2.5 high with the Stiletto with that engine... and then add 3 inches for the 30 Inch set back bracket? making it a total of 5.5 inches up from the bottom with no issues and could go as high as 6 inches?

14 1/2 x 17 Stiletto Advantage.. Appreciate the input.. Bushwhacker said you had done some extensive testing on this...

Appreciate the feedback.

When you say Hard to Swing... you mean?

Thanks In advance Robert

[McGillicuddy]

Some props are harder to turn than others. Blade shape and blade area, rake, cupping and of course pitch all factor into how much resistance the water forces on the prop. Weight and hull shape, as well as power also influence prop selection. Height of the motor affects this, too.

The Stiletto has a lot of cupping and aggressive rake as well as plenty of blade area. Less power and more weight will require less pitch than what ESD is running, that's why he is recommending a 17 pitch vs the 19 he runs. The cupping is what allows ESD's motor to run so high without blowing out.

Keep in mind your going to have a lot more weight forward with the cuddy and seats forward and all the stuff you'll likely be putting up there so you're likely gonna being riding higher aft anyway.

[bgreene]

Cav plate should be just above water when on plane, at speed, and when trimmed out at least 1/2 way to fully trimmed before the prop starts to lose its bite.
IF motor cav plate is under water when trimmed out running, then it's creating extra drag - it's pushing through the water, pulling on your transom, and slowing the boat .....

Like if you put your hand under water flat, and turn as fast as you can go, then angle your hand and try to keep it under water - you'd feel the drag under the water. Same for outboard.

Interesting that many marina's, dealers etc rig a bit too low......

I raised my 200 E etec and it's better, I may even go another hole - UP.
Don't sweat it if you change the position once or twice.