Whats the diff between a #5 and #6
#21
10x
![](https://www.offshoreonly.com/forums/images/icons/prop.gif)
![Default](/forums/images/icons/icon1.gif)
Jeff... You take the measurements from the very bottom of the boat, (the V). If your shafts are within an inch above the bottom V in line with the shaft, then I'd have to say that that's just about where you need to be.
Whoever set up that boat for the 1st time using the SSM#5's with the boxes, I'd say did a pretty good job.
If you add any spacers now, and put the props in deeper, I'd have to bet that you'll see a loss in speed.
Now you need to start trying some different props.
What are the drive ratio's? Don't remember if you said earlier, sorry, 1.48's ( we usually round that # to just 1.5's for easy speakin)
What's your prop diameter? I see you're running 5 blades.
What's the pitch?
What rpm are you turning at WOT? and what speed?
Did you dyno the engines? What hp @ what rpm, and what torque at what rpm?
These are ALL factors that you need to consider when selecting your props
Also, is there ANY kind of a hook in the bottom of the hull? I would think that the hull has been blueprinted at the factory before it left. If not, that's another area that you may want to look into.
Bottom line here: I don't think that for the cost of switching over to a dry #6 that you will see a noticable difference. Atleast not for what it's gonna cost you. But, if $$$$$ not a problem here then go for it, I'm sure you will pick up a few mph, done properly.
Whoever set up that boat for the 1st time using the SSM#5's with the boxes, I'd say did a pretty good job.
If you add any spacers now, and put the props in deeper, I'd have to bet that you'll see a loss in speed.
Now you need to start trying some different props.
What are the drive ratio's? Don't remember if you said earlier, sorry, 1.48's ( we usually round that # to just 1.5's for easy speakin)
What's your prop diameter? I see you're running 5 blades.
What's the pitch?
What rpm are you turning at WOT? and what speed?
Did you dyno the engines? What hp @ what rpm, and what torque at what rpm?
These are ALL factors that you need to consider when selecting your props
Also, is there ANY kind of a hook in the bottom of the hull? I would think that the hull has been blueprinted at the factory before it left. If not, that's another area that you may want to look into.
Bottom line here: I don't think that for the cost of switching over to a dry #6 that you will see a noticable difference. Atleast not for what it's gonna cost you. But, if $$$$$ not a problem here then go for it, I'm sure you will pick up a few mph, done properly.
__________________
Fountain powerboats rule "The Preacher"
Chicago Powerboat Club Director
[email protected]
www.chicagopowerboat.com
Fountain powerboats rule "The Preacher"
Chicago Powerboat Club Director
[email protected]
www.chicagopowerboat.com
![](http://i4.photobucket.com/albums/y137/purple66bu/motorsindaboat.jpg)
#22
Platinum Member
![](https://www.offshoreonly.com/forums/images/icons/platinum_member_star.gif)
Thread Starter
![Default](/forums/images/icons/icon1.gif)
Originally Posted by 10x
Jeff... You take the measurements from the very bottom of the boat, (the V). If your shafts are within an inch above the bottom V in line with the shaft, then I'd have to say that that's just about where you need to be.
Whoever set up that boat for the 1st time using the SSM#5's with the boxes, I'd say did a pretty good job.
If you add any spacers now, and put the props in deeper, I'd have to bet that you'll see a loss in speed.
Now you need to start trying some different props.
What are the drive ratio's? Don't remember if you said earlier, sorry, 1.48's ( we usually round that # to just 1.5's for easy speakin)
What's your prop diameter? I see you're running 5 blades.
What's the pitch?
What rpm are you turning at WOT? and what speed?
Did you dyno the engines? What hp @ what rpm, and what torque at what rpm?
These are ALL factors that you need to consider when selecting your props
Also, is there ANY kind of a hook in the bottom of the hull? I would think that the hull has been blueprinted at the factory before it left. If not, that's another area that you may want to look into.
Bottom line here: I don't think that for the cost of switching over to a dry #6 that you will see a noticable difference. Atleast not for what it's gonna cost you. But, if $$$$$ not a problem here then go for it, I'm sure you will pick up a few mph, done properly.
Whoever set up that boat for the 1st time using the SSM#5's with the boxes, I'd say did a pretty good job.
If you add any spacers now, and put the props in deeper, I'd have to bet that you'll see a loss in speed.
Now you need to start trying some different props.
What are the drive ratio's? Don't remember if you said earlier, sorry, 1.48's ( we usually round that # to just 1.5's for easy speakin)
What's your prop diameter? I see you're running 5 blades.
What's the pitch?
What rpm are you turning at WOT? and what speed?
Did you dyno the engines? What hp @ what rpm, and what torque at what rpm?
These are ALL factors that you need to consider when selecting your props
Also, is there ANY kind of a hook in the bottom of the hull? I would think that the hull has been blueprinted at the factory before it left. If not, that's another area that you may want to look into.
Bottom line here: I don't think that for the cost of switching over to a dry #6 that you will see a noticable difference. Atleast not for what it's gonna cost you. But, if $$$$$ not a problem here then go for it, I'm sure you will pick up a few mph, done properly.
#23
10x
![](https://www.offshoreonly.com/forums/images/icons/prop.gif)
![Default](/forums/images/icons/icon1.gif)
Jeff, I think I understand what you mean. But, remember, if the props go too deep, then you will start lifting the stern and the boat will start bow steering.
I really think you might want to look at the bottom of the boat. From what you're saying, it sounds like the drives are pretty close to being in the right place. But if the boat is breaking water at the driver's seat when you're trimmed out, then that's saying that the drives are too deep already cause you're starting to lift the stern, OR, there might be somewhat of a slight hook in the bottom of the hull and that's what's keeping the nose from lifting.
Don't know what kind of HP you're running, or the weight of your hull, but it takes alot of HP to "carry" the nose of a heavy boat, up in the air.
This gets way too complicated to type, if you'd like to give me a call I'd be more than happy to tell you some of the similiar problems we've had with customers boats that had similiar problems as yours.
Frank.....708-579-5434
I really think you might want to look at the bottom of the boat. From what you're saying, it sounds like the drives are pretty close to being in the right place. But if the boat is breaking water at the driver's seat when you're trimmed out, then that's saying that the drives are too deep already cause you're starting to lift the stern, OR, there might be somewhat of a slight hook in the bottom of the hull and that's what's keeping the nose from lifting.
Don't know what kind of HP you're running, or the weight of your hull, but it takes alot of HP to "carry" the nose of a heavy boat, up in the air.
This gets way too complicated to type, if you'd like to give me a call I'd be more than happy to tell you some of the similiar problems we've had with customers boats that had similiar problems as yours.
Frank.....708-579-5434
__________________
Fountain powerboats rule "The Preacher"
Chicago Powerboat Club Director
[email protected]
www.chicagopowerboat.com
Fountain powerboats rule "The Preacher"
Chicago Powerboat Club Director
[email protected]
www.chicagopowerboat.com
![](http://i4.photobucket.com/albums/y137/purple66bu/motorsindaboat.jpg)
#24
Platinum Member
![](https://www.offshoreonly.com/forums/images/icons/platinum_member_star.gif)
Thread Starter
![Default](/forums/images/icons/icon1.gif)
Thanks for the help Frank, apprieciate it.
Gary thanks for your help as well, I will be needing more than 1" spacer, probably 2-3", Ill let you know once Im at Nortech, and find out what they have, maybe they will have a 2" and combine it with yours, thanks Jeff
Gary thanks for your help as well, I will be needing more than 1" spacer, probably 2-3", Ill let you know once Im at Nortech, and find out what they have, maybe they will have a 2" and combine it with yours, thanks Jeff
#25
Platinum Member
![](https://www.offshoreonly.com/forums/images/icons/platinum_member_star.gif)
![Default](/forums/images/icons/icon1.gif)
Hey Jeff:
I'll trade you my # 6's for your # 5's. Then, if needed, get my # 6's modified to dry sump units. I even have different spacers to go with them. You pay for the labor......
Sounds like your COG is too far forward with that fancy cabin and mine is possibly too far to the rear.
I'll trade you my # 6's for your # 5's. Then, if needed, get my # 6's modified to dry sump units. I even have different spacers to go with them. You pay for the labor......
![Big Grin](/forums/images/smilies/biggrin.gif)
![Big Grin](/forums/images/smilies/biggrin.gif)
Sounds like your COG is too far forward with that fancy cabin and mine is possibly too far to the rear.
![Drink](/forums/images/smilies/drink.gif)
#27
Platinum Member
![](https://www.offshoreonly.com/forums/images/icons/platinum_member_star.gif)
Thread Starter
![Default](/forums/images/icons/icon1.gif)
Originally Posted by Cignificant Other
Hey Jeff:
I'll trade you my # 6's for your # 5's. Then, if needed, get my # 6's modified to dry sump units. I even have different spacers to go with them. You pay for the labor......
Sounds like your COG is too far forward with that fancy cabin and mine is possibly too far to the rear.![Drink](/forums/images/smilies/drink.gif)
I'll trade you my # 6's for your # 5's. Then, if needed, get my # 6's modified to dry sump units. I even have different spacers to go with them. You pay for the labor......
![Big Grin](/forums/images/smilies/biggrin.gif)
![Big Grin](/forums/images/smilies/biggrin.gif)
Sounds like your COG is too far forward with that fancy cabin and mine is possibly too far to the rear.
![Drink](/forums/images/smilies/drink.gif)
Thread
Thread Starter
Forum
Replies
Last Post
Pure Energy
General Boating Discussion
1
12-05-2005 10:41 AM