Moving 3rd toon back

[REBEL3068]

Have a 2006 Bennington 22' tritoon with Honda150 4stroke.
Its runs around 30mph.
What I was thinking of doing, and would like some opinions before jumping in it. If I move the 3rd toon back, would it increase speed. All tritoons I see the motor is back farther than the other toons. I can go back 20" easily. Anything different I just have make another cross member. I was also thinking that might get the rear a little more out of water. Do any of you think this will help or just waste of time.
Thanks for any help

 

[Scott06]

Have a 2006 Bennington 22' tritoon with Honda150 4stroke.
Its runs around 30mph.
What I was thinking of doing, and would like some opinions before jumping in it. If I move the 3rd toon back, would it increase speed. All tritoons I see the motor is back farther than the other toons. I can go back 20" easily. Anything different I just have make another cross member. I was also thinking that might get the rear a little more out of water. Do any of you think this will help or just waste of time.
Thanks for any help

I cant' comment on the position of the center toon, but I think it would be a waste of time as you likely need more power to go faster.

Also have you optimized motor height and prop selection yet?

 

[ahicks]

There's a LOT to this question. Without knowing a lot more about the boat I'd be afraid to even guess. Lifting strakes? If so, location? Diameter of center pontoon relative to the outside toons? How does it sit in the water now? Etc. etc, etc.....

 

[REBEL3068]

There's a LOT to this question. Without knowing a lot more about the boat I'd be afraid to even guess. Lifting strakes? If so, location? Diameter of center pontoon relative to the outside toons? How does it sit in the water now? Etc. etc, etc.....

no lifting strakes
all 3 toons are same diameter and lemgth 25"
rear of boat is running 6" lower than front
thanks
anything else will be glad to answer

 

[REBEL3068]

I cant' comment on the position of the center toon, but I think it would be a waste of time as you likely need more power to go faster.

Also have you optimized motor height and prop selection yet?

I tried several props until I found one that runs round 30mph and still takes off fine. But that was all I could get. Have it bolted in top hole and does not run out of water in turns.
I know its not gonna run no 50 or anything. But I had a 24' pontoon with a 115hp Yamaha that ran 27mph, I just thought this tritoon hich is 22' with a 150 would do better than that. And I have also noticed most tritoons motors are a foot or so further back than mine is. Just wondered if that make much difference

 

[briangcc]

I'd be concerned that moving the center log back would change the stresses on the toon and could be the tipping point for possible failure. What that'd look like is anyone's guess.

If the toon supports it, might just want a bigger motor. If not, might be time to upgrade to a different pontoon boat with lifting strakes and larger motor.

 

[flashback]

They are basically displacement boats, a third tune is just more resistance unless you have the HP to get it going.

 

[Scott Danforth]

unless you reduce the wetted surface area (lifting strakes, etc), its a fools errand. to go faster, you need more torque at the prop. to get more torque at the prop, you need a bigger motor

 

[REBEL3068]

How much affect will lifting strakes have on this boat

 

[Scott Danforth]

You will probably gain about 3-5 mph

 

[mr 88]

You cannot compare motors as the boats are not the same. As mentioned the third toon is adding considerable drag and what was the weight difference. Was the Mercury a 2 stroke that weighs a lot less than a 4 stroke. Yes the lifting strakes are designed to lift the toons up s bit , less drag . Do the toons have a flat planing surface on them near the back of them. That's helps considerably

 

[garbageguy]

I'd be concerned what moving the center-log back would do to the hydraulic performance of such a 'hull' (aside from structural concerns of the entire craft)

 

[airshot]

One would think that toons would fly with a 150 hp motor but the real truth is...they are not speed demons without large engines !! They can be very efficient at slower speeds but not at high speeds, just the nature of the beast. Just for your curioisity, in my local marina I have a couple with a big tritoon, about 28-30' in length and he has twin 300 hp mercs on the back !! He just gets over 40 mph with this rig. Lots of hp required to get that speed, imagine what a speedboat of 30' would do with that 600 hp ????

 

[REBEL3068]

You cannot compare motors as the boats are not the same. As mentioned the third toon is adding considerable drag and what was the weight difference. Was the Mercury a 2 stroke that weighs a lot less than a 4 stroke. Yes the lifting strakes are designed to lift the toons up s bit , less drag . Do the toons have a flat planing surface on them near the back of them. That's helps considerably

No they are round all the way

 

[REBEL3068]

One would think that toons would fly with a 150 hp motor but the real truth is...they are not speed demons without large engines !! They can be very efficient at slower speeds but not at high speeds, just the nature of the beast. Just for your curioisity, in my local marina I have a couple with a big tritoon, about 28-30' in length and he has twin 300 hp mercs on the back !! He just gets over 40 mph with this rig. Lots of hp required to get that speed, imagine what a speedboat of 30' would do with that 600 hp ????

Dang that's alot of gas for not much speed.
I git a 24ft center console that runs 64. If I want speed guess that's the boat. I just figured another 10mph on the toon would be nice. But doesn't sound like that is easily done. Thanks