TUBBIE PROBLEM!!!
- Thread starter kwakhead
- Start date
Well here are some pics, I think Shaun might have installed them a bit too high off the bottom causing the ski to want to drop into the water. Before I start hacking and wacking, anyone have any suggestions to mod these tubbies to help with my issue.. Maybe filling in the dip and re glassing...
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OCD Solutions
Original, Clean and Dependable Solutions
- Location
- Rentz, GA
Personally I think higher is better. That way they make less contact at speed and only come into effect when you drop the nose in or slow down.
BruceSki
Formerly Motoman25
- Location
- Long Island
Those tubbies were probably good when the first guy made them, but now you have a copy of a copy(probably built to half the thickness of the originals and flexing). Think of an old cassette tape that's been dubbed off a dub off a dub.
Sounds like poop=rides like poop.
Sounds like poop=rides like poop.
OCD Solutions
Original, Clean and Dependable Solutions
- Location
- Rentz, GA
I have a set of the originals (#zero) on my wife's 07 and love them. It's one of the best handling SJ's I have ever ridden.
The problem is it seems to make my ski have a "plowing" effect
BruceSki
Formerly Motoman25
- Location
- Long Island
Hook it up to a tractor and drag it around a field then. You'll make nice rows for seed.
Joker
...chaos? Its Fair!
- Location
- La Porte, Indiana
It's either he has deviated from the the original product and they have too large of a footprint or they are too low.
OCD Solutions
Original, Clean and Dependable Solutions
- Location
- Rentz, GA
I agree, the originals were formed in a fashion that they really could only go on in one place and that place was perfect. I put Blowsion Destroyers on my 96 SJ and they had infinite placement options. I placed mine wrong and hated them. In fact, they felt much like what the OP describes.
If I remember correctly, chine walk is affected most by their height and the pull down into the water is affected by how far forward they are on the hull. ScottS has been developing a set for the Matrix and has tried 4 or 5 different designs, contours and placements so he is quite well versed on the subject. I can't stand the idea of putting more holes in my Carbon hull so I really haven't paid very close attention to his findings
If you can find a copy of the Blowsion tubbie installation instructions, you can see their notes on how different placement will net different results.
I see what you guys mean. I do believe they were positioned too far off the bottom. As for not being enough like the originals, I'm not sure, lol he's pretty good at rippingvthings off when he wants to be honestly. He is able to make quality stuff, I'm not sure why he would rather make cheap stuff, but its an alternative I guess. As for plowing the feild... I'll consider that with some 650sx hulls I got laying around ha, those hulls are turds.
I somewhat disagree, to my experience now, they seem to keep the nose down the further up they are, I could be wrong, but that's how I feel.
If it was me, I would've lined the bottom of the tubbies up with the bottom of the hull, to give me the lighter feel...
Joker
...chaos? Its Fair!
- Location
- La Porte, Indiana
Do you understand how the footprint of a hull interacts with the surface of the water at different speeds?
Had a busy weekend with this ski. No wonder it was studdering and sputtering, stator got loose!! Loctited it into place, lightened the flywheel, ported it, milled the head, honed the jugs and re gasketed everything, and rebuilt my new sbn46. Hoping she flies now, though I need a pipe, lol sell a 550 I guess..... A b pipe isn't free!
I'm new to understanding how the tubbies play into everything, yes I have a brief understanding... That's what they call it eh? Footprint
I know there's alot that factors in to how a ski rides... I understand the "hydro dynamics" lol
Big Kahuna
Administrator
- Location
- Tuscaloosa, AL
In a straight line a tubby is going to give more lift the a ski. When going into a turn as the ski leans over the water passes around the tubbie giving lift to the nose helping the ski to carve the turn.
I always try to set the tubbies up a bit higher than the bottom of the hull as it gives some extra edges/chines for the water to work against. The longer the tubbies, the more likely they will be to pull the nose down. When they are only half length, the nose lifts and allows the tail to stay buried. When they are long, the rear gets lifted as well and causes the ski to ride flat.
Obviously more surface area on the base of the ski will cause drag, but shouldn't hold the ski to the water like you are describing. Sounds to me like you need more power, and less aggressive intake grate and and a cut/loosened ride plate.
Obviously more surface area on the base of the ski will cause drag, but shouldn't hold the ski to the water like you are describing. Sounds to me like you need more power, and less aggressive intake grate and and a cut/loosened ride plate.
OCD Solutions
Original, Clean and Dependable Solutions
- Location
- Rentz, GA