SoCal Jet Boats
Tech Talk => Hulls => Topic started by: Marcsrollin on November 07, 2007, 04:21:48 PM
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How much HP can I put in my boat before I have to start worring about my stringers? I have a 76 Tahiti W/Quartrer stringers.
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There are several people on hotboat with 700hp+ and running quarter strings.... or maybe they had engine boxes.
Not very hard to make it into an engine box, check out 2sav's fantasy floor
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I'm not sure the Tahiti will handle very good with a ton of power. They weren't designed to anyways . Maybe rigger will chime in on this.
-beerjet-
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I am only talking about between 600 to maybe 650 HP.
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I am only talking about between 600 to maybe 650 HP.
do it
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do it x2
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I plan on it! I was just wanting to know what to expect.
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I plan on it! I was just wanting to know what to expect.
Expect to go faster ;D
2sav
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Expect to go faster ;D
2sav
good answer ;)
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I'm still tryin' to figure out what the hell an engine box is? ???
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I'm still tryin' to figure out what the hell an engine box is? ???
me too ???
i assume its a 1/4 stringer boat with a piece of wood closing off those stringers...making ...a .....box?
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I was thinking the same
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I'm still tryin' to figure out what the hell an engine box is? ???
So , oldrigger what do you hink my boat's max HP is in your opinion?
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Well in my Sleekcraft it's a quarter stringer boat. And some have the same thing but the front of the stringers are glassed together with a piece of wood.
I would assume it would add support instead of just the wood standing by itself, but what the hell do I know ???
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Well in my Sleekcraft it's a quarter stringer boat. And some have the same thing but the front of the stringers are glassed together with a piece of wood.
I would assume it would add support instead of just the wood standing by itself, but what the hell do I know ???
I am looking for a number!
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Well Impatient on HB drove around for along time with 900+(nitrous) in his quarter stringer boat and reported he never had a problem.
But to my understanding alot of boats are built better than others so it could be different for every boat. I could be wrong, hopefully Old Rigger will shine some light
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I am only talking about between 600 to maybe 650 HP.
I think you'll be fine . You'll be doin at least 80 on a bad day .
-beerjet-
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i had my race motor in the hawaiin i gave rod no probs >:D
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I have a slightly different opinion... Hulls are designed with a potential, considering speed and HP. If you exceed the capabilities of the design, you're asking for trouble. I have personally seen the results of too much horsepower in a boat that wasn't designed for it. It sounds like you've already made up your mind on what to do with the boat. If you do add that much power to the boat.....Well, just inspect it very closely after each hard pass in rough water. It's not the glassy smooth water that I worry about , it's the rough. All boats flex and change shape in the water, and it is exxagerated in rough water. Now, add horsepower and there could be an issue. Look for signs of stress between the seating area and the leading edge of the stringer. This is where I believe you WILL have problems. It may not be this year or even next year, but it will occur.
The other option is to take the money being spent on the motor, and put it towards a hull that has the potential to do what you want. Upgrade the motor later on when money permits, and then you don't have any question on hull integrity.
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I have a slightly different opinion... Hulls are designed with a potential, considering speed and HP. If you exceed the capabilities of the design, you're asking for trouble. I have personally seen the results of too much horsepower in a boat that wasn't designed for it. It sounds like you've already made up your mind on what to do with the boat. If you do add that much power to the boat.....Well, just inspect it very closely after each hard pass in rough water. It's not the glassy smooth water that I worry about , it's the rough. All boats flex and change shape in the water, and it is exxagerated in rough water. Now, add horsepower and there could be an issue. Look for signs of stress between the seating area and the leading edge of the stringer. This is where I believe you WILL have problems. It may not be this year or even next year, but it will occur.
The other option is to take the money being spent on the motor, and put it towards a hull that has the potential to do what you want. Upgrade the motor later on when money permits, and then you don't have any question on hull integrity.
Thank You!!
That was the kind of answer I was looking for. I was also hoping oldrigger would give me a approx. on what the boat was made for since he worked where the boat was made.
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Thank You!!
That was the kind of answer I was looking for. I was also hoping oldrigger would give me a approx. on what the boat was made for since he worked where the boat was made.
Had I been working there when your boat was built I would have given you my opinion. I left Tahiti in 1974, I have no fuking idea what was going on there when I was at another shop. ;D
By the way, this motor box you guys keep talking about, doesn't do jack shit. The idea of full stringers, in a jet, is to spread the load, or the strain, over the length of the bottom. Stubby stringers won't do this, but depending on the lamination schedule (the amount of glass UNDER the stringers, among other things) this could or could not be a problem. My dads old Hawaiian had stubby stringers, extremely nice lay-up, for a Hawaiian, had a healthy BBC and would run 72-74 mph. No flex, no hook, no distortion. Would have full stringers made a difference, probably not for his purposes. Do bottoms flex on a boat with stubby stringers, yes, 48 inches in front of the transom...where they end. Any hook that might already be in place is exaggerated at speed, the faster you go, the worse it gets.
You could build a 'motor box' that came up as high as the gunales and the bottom would still flex at the same spot.
And full-length strings don't always mean 'quality'. The reason some Hawaiian's have them isn't because of any high performance goals. It was because the laminators began to leave out some of the layers of glass because one of the company owners decided they were making too much money. So they lowered their pay. We were all piece work then, so as you can imagine this pissed off quite of few guys. To retaliate, they just left a bunch of glass out. We had hundreds of boats come back with the bottom falling out to be repair under warranty. We had 2 full time guys that did nothing, for years, but fix bottoms. The full stringers were a band-aid fix, but of course were used as a selling tool.
All shops have the same horror stories...you just don't really want to hear them. lol
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Had I been working there when your boat was built I would have given you my opinion. I left Tahiti in 1974, I have no fuking idea what was going on there when I was at another shop. ;D
By the way, this motor box you guys keep talking about, doesn't do jack shit. The idea of full stringers, in a jet, is to spread the load, or the strain, over the length of the bottom. Stubby stringers won't do this, but depending on the lamination schedule (the amount of glass UNDER the stringers, among other things) this could or could not be a problem. My dads old Hawaiian had stubby stringers, extremely nice lay-up, for a Hawaiian, had a healthy BBC and would run 72-74 mph. No flex, no hook, no distortion. Would have full stringers made a difference, probably not for his purposes. Do bottoms flex on a boat with stubby stringers, yes, 48 inches in front of the transom...where they end. Any hook that might already be in place is exaggerated at speed, the faster you go, the worse it gets.
You could build a 'motor box' that came up as high as the gunales and the bottom would still flex at the same spot.
And full-length strings don't always mean 'quality'. The reason some Hawaiian's have them isn't because of any high performance goals. It was because the laminators began to leave out some of the layers of glass because one of the company owners decided they were making too much money. So they lowered their pay. We were all piece work then, so as you can imagine this pissed off quite of few guys. To retaliate, they just left a bunch of glass out. We had hundreds of boats come back with the bottom falling out to be repair under warranty. We had 2 full time guys that did nothing, for years, but fix bottoms. The full stringers were a band-aid fix, but of course were used as a selling tool.
All shops have the same horror stories...you just don't really want to hear them. lol
dam that's scary!
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Had I been working there when your boat was built I would have given you my opinion. I left Tahiti in 1974, I have no fuking idea what was going on there when I was at another shop. ;D
By the way, this motor box you guys keep talking about, doesn't do jack shit. The idea of full stringers, in a jet, is to spread the load, or the strain, over the length of the bottom. Stubby stringers won't do this, but depending on the lamination schedule (the amount of glass UNDER the stringers, among other things) this could or could not be a problem. My dads old Hawaiian had stubby stringers, extremely nice lay-up, for a Hawaiian, had a healthy BBC and would run 72-74 mph. No flex, no hook, no distortion. Would have full stringers made a difference, probably not for his purposes. Do bottoms flex on a boat with stubby stringers, yes, 48 inches in front of the transom...where they end. Any hook that might already be in place is exaggerated at speed, the faster you go, the worse it gets.
You could build a 'motor box' that came up as high as the gunales and the bottom would still flex at the same spot.
And full-length strings don't always mean 'quality'. The reason some Hawaiian's have them isn't because of any high performance goals. It was because the laminators began to leave out some of the layers of glass because one of the company owners decided they were making too much money. So they lowered their pay. We were all piece work then, so as you can imagine this pissed off quite of few guys. To retaliate, they just left a bunch of glass out. We had hundreds of boats come back with the bottom falling out to be repair under warranty. We had 2 full time guys that did nothing, for years, but fix bottoms. The full stringers were a band-aid fix, but of course were used as a selling tool.
All shops have the same horror stories...you just don't really want to hear them. lol
Thank you!! ;D
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...another great post by old rigger.
wheres my breakfast beer?
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wheres my breakfast beer?
lol
I was thinking about you guys Sunday morning. I was actually there, but not at the swapmeet. I got up at 5:30, said 'fuk it' stayed in bed. But our son had a baseball game right next door at city college at 10. I could see all you swappers milling about and I was thinking, 'damn, I forgot that I needed this and that.' And you know that's a good swap meet to get a little 'this and that'.
Next time I'll buy you two beers Brad. ;)
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...another great post by old rigger.
wheres my breakfast beer?
Fuk you man ! Where's mine ! ;D
-beerjet-
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Fuk you man ! Where's mine ! ;D-beerjet-
I was thinking about you too, even phoned ahead to see if they had any light beer for you 'cause I kow how much you like that cat piss. You know what the guy said when I asked him if they sold light beer at the consession stand??????
He said "light beer? Drinkin' that is like suckin titty through a night gown"
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Thats it ! I quit racing for good ! Wait a minute ....... thats a diffrent thread, :-\ From now on , I'm carryin a bottle of tequila with me everywhere I go !(https://www.socaljetboats.com/cpg/albums/userpics/10034/drink.gif)
-beerjet-
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Thats it ! I quit racing for good ! Wait a minute ....... thats a diffrent thread, :-\ From now on , I'm carryin a bottle of tequila with me everywhere I go !(https://www.socaljetboats.com/cpg/albums/userpics/10034/drink.gif)
-beerjet-
Everybody hate's a quiter :o
And eat the worm last ;)
2sav
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Thats it ! I quit racing for good ! Wait a minute ....... thats a diffrent thread, :-\ From now on , I'm carryin a bottle of tequila with me everywhere I go !(https://www.socaljetboats.com/cpg/albums/userpics/10034/drink.gif)
-beerjet-
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.websophist.com%2FLaughing_RoflSmileyLJ.gif&hash=dcc0567559bda1d3cdfbcb6c751bfc5f2b0c4328)
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Getting back to the stinger question... One major reason to have full length stringers is to help keep the bottom straight. Short stringers and a bad trailer could put a nasty hook in the bottom over time. It might run great at first but after a few years it might develop a nasty hop which you don't want to deal with when you have lots of speed.
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Well im gonna do as big of hp as i can on pump gas in a quarter stringer. gonna have to see what happens
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Make sure your life insurance will pay off to the next of kin if the boat does the devil dance...
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Make sure your life insurance will pay off to the next of kin if the boat does the devil dance...
What exactly can i expect out of this? fock the insurance! i dont get any of it!
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What exactly can i expect out of this? fock the insurance! i dont get any of it!
Go big, or leave it on the trailer :o
i am ;D
2sav
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no room for pussies!!!!!
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no room for pussies!!!!!
i have no issues against fearless people....i admire it.....but theres a fine line between fearless and stupid. ;D
Lets not be stupid ryan......build it safe n smart.....but with balls. ;)
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Brad can't agree more no need to come up with 100 mph hardware and put it in a 70 MPH hull. This sounds like the Kid who put twin 1150 cfm nominators in a stock 350 and couldn't understand why his truck didn't run any better. Or worse yet Malcome Cambell who solved everything with horsepower but forgot to survive to tell the story.
If Ryan, you want to go fast, you can do it. But do it right. It's not good for you and it's not good for the sport if you hurt yourself or someone else. It really doesn't take that much time or effort to upgrade your hull and do it right. Remember those stringers were installed to meet USCG standards ( probably posted on your data plate with 250-300hp max) and the things we do tho these boats now will stress a boat to the limits when traveling in the rough at high speed. Be careful and God Speed...
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Yeah i know better. im thinking about doing it full stringer. what are you guy's opinion on that?
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Better safe than sorry. I think full stringers will help keep the hull from flexing and keep it straight for years. Better ride now, better ride later. Safe motoring.. ( and give em' hell)
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Then thats the angle im gonna take on it! >:D
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But it would be a shame to tear up that new floor
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But it would be a shame to tear up that new floor
But sometimes ya gotta do what ya gotta do!
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But sometimes ya gotta do what ya gotta do!
New owner , new set of rules ;)
2sav