- Location
- Jourdanton, Texas, United States
I only know of two place. The guy I went to is at lake fork and the other guy is in Toledo Bend.
Other Gel Coating
- Thread starter u887266
- Start date
- Location
- Houston/Galveston
Like a golf ball, texture the surface to bring the object from the turbulant fluid region to the laminar region.
Not sure at what velocity a watercraft hull would enter the critcal reynolds number but if it was in or near the transition region, this could help it.
By increasing the friction factor, which is inversaly perportionate to velocity squared, you affect the reynolds number. so at a given speed, and at a givin friction factor, you can effectivly bring an object into the laminer region.
All this can be determined using a moody diagram and knowledge of some basic fluid dynamic principals.
I don't want to run the numbers to see if it works or not. Have fun
Thank you Bill Nye.
http://www.billnye.com/index.asp
Cannibal
Tasty Human
- Location
- Summit Lake, WA
Bill Nye rocks. I got to meet him one time when he came into my work to film something about aerodynamics. Cool guy.
- Location
- Houston/Galveston
yea he is much better than Binkmans World. hahaha
Cannibal
Tasty Human
- Location
- Summit Lake, WA
Nobody beats Mr. Wizard though.
LOL sorry for the cryptic post, it made sense in my head. :nana:
I hate it when people post crap that they have no idea about, the web is full of it. "my internet friend's mechanic told him that microbubbles break surface tension which causes the water to repel the hull, its like a magnetic effect of reverse polarity, thats why my ski is faster"...
Long short is under certain conditions (not sure if it applies to watercraft), if you increase the surface area by say, sanding it with heavy grit sand paper, the added friction at a given velocity will cause something to move faster than if the surface was smooth. Yes it sounds wacky, it sounds counter intuitive, but it is true--a very good example is a golf ball.
Keep in mind, this is at relativly slower speeds, and a sweet spot at that. Smooth surfaces are still important to things like race cars and rocket ships.
I hate it when people post crap that they have no idea about, the web is full of it. "my internet friend's mechanic told him that microbubbles break surface tension which causes the water to repel the hull, its like a magnetic effect of reverse polarity, thats why my ski is faster"...
Long short is under certain conditions (not sure if it applies to watercraft), if you increase the surface area by say, sanding it with heavy grit sand paper, the added friction at a given velocity will cause something to move faster than if the surface was smooth. Yes it sounds wacky, it sounds counter intuitive, but it is true--a very good example is a golf ball.
Keep in mind, this is at relativly slower speeds, and a sweet spot at that. Smooth surfaces are still important to things like race cars and rocket ships.
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teton
tetongravity.com
- Location
- Washington DC
A golf ball has an organized pattern that helps because the golf ball is a sphere, anything that is optimised for laminar-turbulent transition is usually in an organized pattern of some sort.....the golf ball indenations also cause lift...
a golf ball, and a jetski hull are very different (not to mention air and water) and critical reynolds numbers are not easy to calculate for unique shapes like a jet-ski hull....there is software out there to do it...
there's no way a random sprayed on pattern would be applicable here....if it cause some advantage it would be pure luck.....
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- Location
- Jourdanton, Texas, United States
I did not say it made the ski go faster, in all reallity I said I lost some speed. I did say though that it helped with the handling and also allowed me to corner harder. All I can really say to you none believers is, if you in my area just let me know and I will let you try this ski for yourself.
curt248
01 superjet 94 fx1 97 xp
- Location
- Chicago IL
hmm. Maybe 8 to 10lbs of extra weight changed the way the boat sits in the water. I believe the sxr goes through chop better than a superjet at least partially from the extra weight.