Surfboard Fin Tutorial

[Wetfins]

Great Vid!

[snowfosho2]

Anybody who knows what the thin board witout fins you surf out from the beach is called ?

[wsk1218]

@snowfosho2 Skimboard

[jkulesha]

no the hydrodynamics make NO sense sorry

[EvelioSurfboards1]

great

[camy2529]

Very quick noob question: Im about to buy replacement fin for my board which is the right and which is the left fin? Probably stupid question but its not cheap and buying online so want to get this right!

[lostsurfer660]

yeah dude, you totally forgot to talk about longboard fins. thanks

[dmann0009]

@lostsurfer660 not really considering the main point of this video is stated at 3:56.

[sunjamsurf]

keep up the good work.

[evelio13]

Very Good Video

[surfingcarver]

Pipe fins on youtube ,see the future

[boothyno19]

the 'drag' from the longer fin is due to whats called induced drag, that is drag created by the flow of water around the fin and will definately slow you down on a small board, as the physical weight also will.

The low pressure on the curved side of the fin is created because water flowing around the fin has further to travel to the rear of the fin, thus travelling faster. The water will want to meet up at the rear of fin, experiment using a spoon by placing the curved side under a running tap

[bluelinesmike]

Hi Shapers Direct,

I enjoyed your breif tutorial. Your basic terminology reflects industry use and your breif of how a fin works is generally pretty right.

For Pattie Cannons comment, The tutorial is correct, the rounded side of the fin is the low pressure side. This is based on Bernoulli's Theory, Its counter-intuitive but 100% true.

The central fin works both ways, but less efficiently because of its symmetrical shape.

Hope this helps to clear up the confusion.

Mike Batt

[pattiecannon]

Cheers Roy, it's good to have a second opinion. Shaper Directs' concept of where high and low pressure are relative the foil seems backwards to me. The sharp edge of the foil catches water transfering it to the side of the soft edge.That equals high pressure on the soft side, right?He may have a point for surfing barrels where the water is running up the face fast and you're tryin not to go up with it. But lets face it most waves you have all three fins in the water.

[cto805]

shut the hell up roy, your a kook, yeah some of its false, deal with it

[RoyStewart]

Yours is a strange attitude, saying shut up and swallow the BS ! What's the point in a tutorial that is full of misinformation?

[ggabe1]

twotorial

[RoyStewart]

Five myths in the first four minutes!

One ghastly myth was the idea that a heavy fin creates drag, weight actually creates drive.

Another classic myth is the idea that the sidefins pull you into the face of the wave when in fact they have the opposite effect due to toe in.

The worst one was the idea that he's "about covered it". . . . nothing could be further from the truth !

To put it bluntly, it's mostly nonsense, but will pass for knowledge with most people.

:(

[BEEBEE159]

@RoyStewart Thanks for trying to set things straight with the fin tutorial, I agree with you. I am trying to make my own fins; and I was wondering if the fin can be made of solid resin. What I mean is, by poring resin into a mold, without using any fiberglass cloth. Do you see any problem with doing that? Please note, in addition to making a regular set of fins that way, I am also planning to make a vortex fin using the same method. Thanks in advance for any suggestions you can give me.

[RoyStewart]

@BEEBEE159 Hi Beebee, I haven't tried that but I think that the resin will not be strong enough with a structural additive. A goof fin panel can be made with sheets of paper and resin, if one wants to avoid the fibreglass itch.

[BEEBEE159]

@RoyStewart Hi Roy, I have a question regarding your vortex fin. I surf with a 9 foot modern longboard; and I made a vortex fin that utilizes the side bite fin boxes, to hold the vortex fin in place. As a result, the single fin is placed behind the vortex fin. That seems to work just fine (makes the board faster and seems to create lift); but I was wondering what's the effect of placing the single fin in front of the vortex fin, which is the way your boards are set up. Thanks in advance.

[srfnff]

Great video, excellent info.