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Dings..... how serious are they?

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Starsky
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Dings..... how serious are they?

Postby Starsky » Mon Jan 25, 2016 4:40 pm

Watching that clip of Laird tow foiling pretty big waves, he can be seen wet sanding the mast and making some crack about samurai ( He claims humility in the same clip, but somehow never seems to pull it off!). Anyway, in another thread on here recently Nicholas from Zeeko mentioned wet sanding the mast and someone else replied about washing it down with soapy water every now and again to get the oils off. All of which suggests a high degree of sensitivity to small imperfections.

On the other side of the coin, I once hit a rock with my foil and took a small chunk out of the LE of the front wing. Rode the rest of the session without really noticing any difference, and that was an irregular gouge out of the shape right where the pressure should be highest. Easily fixed but I've been wondering ever since, how important is it for us cruisers to keep our foils immaculate? If your not going to be pushing the foil to its top end, are you really going to notice, and how much damage/wear from transport and general beach life starts to have an impact on your fun?

Of course racers are looking to max their speed in any way possible and absolutely minimize spin out. (I can also understand Laird taking every precaution in large conditions) My question is more in relation to free riders, and how dings and dirt etc will impact the foils low and mid range of the speed spectrum while carving?

Brian Camet
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Re: Dings..... how serious are they?

Postby Brian Camet » Mon Jan 25, 2016 5:24 pm

Laird is wet sanding it because it is raw aluminum foil. The salt water will oxidize the aluminum so by wet sanding it you remove the oxidation leaving a smooth surface. Regarding inperfection in your foils. Only at very big speeds with you notice the difference but by fixing it you may reduce vibrations or noise. For just playing around you don't need to be to worried about small imperfections.



Brian


http://www.cametkiteboarding.com

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Starsky
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Re: Dings..... how serious are they?

Postby Starsky » Tue Jan 26, 2016 12:14 pm

Thanks Brian

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Re: Dings..... how serious are they?

Postby flying grandpa » Fri Feb 05, 2016 1:16 am

Brian Camet wrote:For just playing around you don't need to be to worried about small imperfections.

That may be true, Brian, providing your foil do not cut water surface. Else, you will experience ventilation, the annoyance of which depends mostly from geometry (dings are as important as a type of profile and its thickness), from water surface tension in relation to foil surface (oils on surface) and water vorticity ( white caps are the worst for me), water saturation with air (white water rich in small air bubbles promote ventilation and cavitatio) and, last but not least, speed. More speed, more ventilation usually, but not always. The air cavity may be stable, difficult to get rid of = explosion, or, on thinner, more " intelligent" foils "deattach" quickly=chance for survive.
Air cavity may attach to your mast passing white cup, or to your foil that cuts water surface on a tight wave turn.
Mast surface perfection is a must for me on thicker masts, like old 80 cm Ketos.
Foil surface perfection is not so critical for me when my max speed is below 30 knots.
Complicated?
After several hundreds of hours your muscles will recognize the risks.

Tadeusz

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Kamikuza
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Re: Dings..... how serious are they?

Postby Kamikuza » Sat Mar 19, 2016 1:15 pm

How about wearing all the paint off the tips from running aground? Should I paint them again?

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Re: Dings..... how serious are they?

Postby tkettlepoint » Sat Mar 19, 2016 2:32 pm

just wet sand it perfect smooth and you will have no problems. if there is any edges it will make bubbles and then you will loose lift.

terrie

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Re: Dings..... how serious are they?

Postby Starsky » Sat Mar 19, 2016 2:38 pm

You can see the wing ventilate on a few of your turns in your video. You probably want to try and minimize that as much as you easily can, so a good sanding is probably a good idea.


As a complete side note. If you are going to rock the shorts over wetsuit look....Please be advised that anything remotely close to flesh tone is not a good choice for shorts. No one needs the visual of a big man in garters...... Your closing clip might have scared me!

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Kamikuza
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Re: Dings..... how serious are they?

Postby Kamikuza » Sat Mar 19, 2016 4:25 pm

When the camera is further away, like a high-Y mount or someone taking pics from the shore, the leg straps bunch up the crotch and that brown color looks like a massive seventies porno pubic bush :o Trying to save the wetsuits from destruction by leg straps. Or thighs rubbing together...like what kills my jeans :cry:

The wing tips are down past the black paint, the white under coat, and the underlying mat material is showing, although still under the epoxy...

There's a nick or two out of the LE too...was thinking of bogging it too but don't know where to start. Hit the anchor rope of a buoy. :roll:

I thought the tips were ventilating because I was leaning the board over too far with the mast too high out of the water...? I've started trying to lower the ride height before gybing and it seems to help...

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Re: Dings..... how serious are they?

Postby Starsky » Sat Mar 19, 2016 4:37 pm

Think your right about ride height and tip vent. But it can't hurt to have that tip shed air as well as possible.

Sand it, paint if you think it needs it and sand again.

Ive fixed a few dings. My wings are glass and its easy enough to fill anything jagged, sand, paint, sand, ride.

To echo what PF said. Pretty good for day 10!


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