Chine renewal

[superjetguy]

I've been working on a 750sx project for a while and the P/O must've beat the crap out of this thing there were so many cracks and scrapes on the bottom. I've addressed most problems, but one thing I haven't done and was needing input on was the chines. They're scraped through to the foam from the guy beaching it for many years. How could I rebuild them quickly and leave a nice looking edge. I tried building up with cabosil but I can't get it to shape how I want.

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[SkiPro]

"Buy a superjet"
I had to.. But seriously...
She'll ride.. Slap some resin on the foam spots and run it.. The rearend will be just a little more playful then most 750s...

 

[VXSXH20]

buy a few pieces of aluminum rod ( easy to shape to hull contours) say 1/8" thick or even a wooden or fiberglass dowel rod like your put in a kite to open the wing up.. honestly whatever you want and coat in in your resin, slightly sand your exisiting chines to the shape you want. and cover it with some glass tape or cloth of your choosing. You can get a nice sharp chine fairly quickly rather than globs of cabosil and constant shaping.

 

[superjetguy]

"Buy a superjet"
I had to.. But seriously...

Yeah well I have a few of those too and my XFT! I got this complete ski for $400 with a running 170psi engine, Coffman rocket exhaust, AC aluminum pole, skat impeller, blowsion tubbies, footholds and the rest of that cool stuff. This will be my chicks ski / buoy chaser

I'll try that dowel idea. I can get carbon fiber dowels from my neighbor he has tons of them for building rc airplanes or something. I'll post pictures of my process.

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[SkiPro]

Haha i know, ive seen some of your posts.. I was just teasin ya!

 

[SUPERJET-113]

That hull is SMC, so if you want a good bond you need to use epoxy resin. I would prep the whole area good with some 80 grit, clean areas with acetone, and mix epoxy resin with west system colloidal silica to a thick smooth peanut butter consistently. Use a plastic 4-5 inch bondo spreader and spread on both sides from top going down to deposit the mixture on the chines nice and evenly. Let dry 24hr then shape. Use a bit of glaze coat or dolphin glaze to fill any pinholes, then prime and paint.

 

[Vumad]

Use a piece of 2" pvc with sand paper wrapped around it going in alternating 45 degree direction to reshape the area.

 

[SUPERJET-113]

Use a piece of 2" pvc with sand paper wrapped around it going in alternating 45 degree direction to reshape the area.

^^^^ Exactly! Thats how the racer true their hulls! Good tip to add.

 

[Midlake Crisis]

Use a piece of 2" pvc with sand paper wrapped around it going in alternating 45 degree direction to reshape the area.

Can you explain the alternating 45* thing?

 

[Vumad]

Can you explain the alternating 45* thing?

Front to back the length of the chine is 0 degrees.

Side to side, perpendicular to the chine is 90 degrees.

Sand at 45 degrees, then At 135 degrees. Alternating between the two directions.

Buy a contour gauge at the hardware store for $10 if you have any doubts about the quality of your shaping job.

 

[superjetguy]

I really hate sanding. I think the dowel idea was pretty sweet. Just smooth in the crack between then I don't have to really worry about shaping it perfectly and worry about the chine being true and straight.


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[superjetguy]

Maybe I'll combine both ideas. I want this ski to be able to ride like its on rails. I had a 750 many moons ago and it had aluminum fins epoxied into the last 8" of the chines, that thing hooked up in turns like you couldn't believe.


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[Vumad]

Maybe I'll combine both ideas. I want this ski to be able to ride like its on rails. I had a 750 many moons ago and it had aluminum fins epoxied into the last 8" of the chines, that thing hooked up in turns like you couldn't believe.


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Go with rear sponsons on the bond rail. They juat bolt on.

 

[Vortex]

Any updates on this project?

 

[Downrange]

Here is a good thread. http://www.pwctoday.com/showthread.php?t=456013&page=6