Does anyone really have a 50MPH Pontoon ?

suneshop

Seaman
Joined
Mar 14, 2013
Messages
56
Who actually has a 50MPH single outboard Pontoon or Tritoon? I have been trying although close no cigar. My attempt is a 2013 23' Crest tritoon lifting strakes and under skinned. 250 Hp Optimax Pro xs. with 17 Pitch Enertia.Top speed gps 47MPH.I would like the details of your go fast pontoon. I wan't that Big 50.:rockon:
 
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lmuss53

Lieutenant Junior Grade
Joined
Sep 9, 2008
Messages
1,227
Run the tanks down real low, leave everybody and everything on the dock and get a little wind at your back, you can hit it yourself.

I was running a friends bass boat last year at WOT and around that 50mph number. I thought to myself, "I wouldnt want to do this in a pontoon." My little 19' Forester with a 55 hp will do 18-20 with a light load.
 

gm280

Supreme Mariner
Joined
Jun 26, 2011
Messages
14,605
That is so easy to accomplish. JATO units will get you there and beyond! :facepalm:

I had a bass boat that would turn 63MPH, but you have to understand the design differences. With a Tri-Toon boat, you have a heck of a lot of water drag with so much aluminum dragging through the water. To get to your mark, you have to reduce both the water drag (friction) AND the Tri-Toon profile that IS bucking the air as well. So you are fighting a two fold issue. Bass boats are very low profile and when they are running fast, there is barely any of the hull actually in the water so friction is nearly gone. The same thing happens when you add a jack plate and lift the engine's lower foot section up a little, it reduces drag.So maybe work at reducing the top profile somehow to reduce the air friction. I don't know how you can reduce the water friction with a Tri-Toon setup, maybe polish the toons to a mirror finish could get it that little extra you need. I know waxing my bass boat lower hull would make a different in almost 3MPH for a time or two before the wax was gone again. :noidea:
 

BrianMc

Petty Officer 2nd Class
Joined
Oct 2, 2010
Messages
177
You aught to be able to. I've seen 43 several times with my 24' 150 in some decent chop. And mine has a T-top.

I have mine balanced to bring my fulcrum point about 1/3 forward. When I'm topped out I'm at full trim,with the front starting to feel lite. I'm riding so high that I have to drop my hydr. JP almost all the way down to trim it out. Figured that would be the case when I hung the motor on the JP,so my starting point was the JP centered with the motor at transom height. I believe your running the right prop. Mines a 16 enertia with the Merc screaming.

What rpm are you at,how are the strakes located on your Crest,and how much are you able to trim out?
 

ahicks

Captain
Joined
Sep 16, 2013
Messages
3,957
Did you have the top down on your speed run? If so, maybe removing it (and anything else that might create a lot of wind resistance - like a windshield) and leaving it on the dock might make enough difference?

Did you play with the engine tilt to see if you could pick anything up that way?

Engine mounted on the transom as high as practical?
 

suneshop

Seaman
Joined
Mar 14, 2013
Messages
56
The First season had to run trimmed all the way in, any move to trim up (out) caused ventilation.That was with motor at it's lowest setting on transom.I needed to lower the motor and since that wasn't possible I added a 5" extension to the lower unit.Then raised motor up 3" up on the transom.That gave me all kinds of ability to trim and that worked very well improving performance and fuel economy. I think the prop is to deep now.Room to move one more hole up. I think I should have installed a hydraulic jack plate instead of the 5" extension.RPM 5900. Can't describe strakes location very well but they look proper when the boat is up and moving.It is great fun and is full of people every weekend. Just interested if anyone came up with the perfect combination.
 

gm280

Supreme Mariner
Joined
Jun 26, 2011
Messages
14,605
Just remember the stresses you will be putting on both the engine and the transom. For you to get to such a speed the engine has to lift the entire hull up and out of the water via the transom setup. Visualize putting a huge wrench on your transom and torqueing it to lift the entire weight of the hull. That IS what your engine has to accomplish while pushing the entire weight forward too. A lot to ask of an engine... It can be done, but not without a very good engine and making the tri-toon as light as possible. And remember, the longer the hull is, the more it magnifies that effort to lift it out of the water. That is just plain physics...
 

BrianMc

Petty Officer 2nd Class
Joined
Oct 2, 2010
Messages
177
No Title

The motor will handle it. At full trim it doesn't know whether it's lifting a V-hull or a 23' toon. You do need to keep an eye on the transom plate and the welds on the transom. I had to reinforce mine. Found a simple fix for it.

The reason we have to drop the motor to trim out is because our straked toons run high and flat. A bass boat runs on top too,but the bow also responds well to trim. It'll lift the nose lowering the prop. The teeter-tatter effect over the fulcrum point. Positive trim pushes down on the motor end of the teeter-tatter. Since we can't lift our heavy nose way up like a bass boat the prop rises more with trim. Bass boats also have a "rate of climb" built right into the hull. As to where tubes are straight. The rate of climb is the angle we can gain on our strakes with trim. Sure they'll pop us up on plane,but then we hit a wall with the given drag of 3-24' tubes and their strakes.

The idea is to reduce friction by lifting as much hull out of the water as possible. The further we can slide the fulcrum point back the more hull we have out of the water. This also increases the rate of climb however,which the motor has to overcome. So, it's a balancing act. How much hull can we carry out of the water with the torque and positive trim of the motor against the fulcrum and rate of climb. The further back the fulcrum the less of your ass is dragging. If that point is too far forward you have more tube on the backside trying to climb,and the motor can't over power that drag. Common sense then tells you to move heavy items in your storage to the back,and the lite stuff to the front.

Your also getting close to your max R's. Not sure when your limiter starts retarding the timing,but doubt you'll get to 50 with a 17 if your at 5900 @ 47. My motor is older so I removed my limiter and let it scream. She may let go some day,but it sure sounds happy running up there. If and when it does go I'll be looking for a 250 and 50+
 

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