That last shot reminds me of those great north shore quiver shots from surfer magazine in the mid to late 1970’s.
All killer, no filler. Marc is the man. I thought my Andreini quiver was stout, yours is awesome.
Sorry for this but I have this for sale if anybody is interested:
http://www.swaylocks.com/cgi/surfshop/page.cgi?g=Detailed/6927.html&d=1
Hi Guys
http://adventuresintrim.blogspot.com/2010/09/my-new-favorite-board.html
Here’s a couple more pics and my thoughts on the 5’8 velo sim mason posted. It’s a ridiculously fun board!
I woke up this morning and was greeted by this soulfull sight.
My legs felt the flow as I caught my breath. This reminds me of every good ride I have had on my vaqueros and of the fact that I am not getting enough surf recently…
http://andreinisurfboards.com/post/1564396446/andreini-team-rider-michael-kew-testing-a
And also a good reason to revive this thead that was languishing on page 6.
Juan
6’3 nuggety thing with a single concave out the last 2 feet or so:
and my new 7’1 for the coming wintertime…
looking forward to this one :)
6'8 and a 5'8
The 6'8 has a trick "flow fin", influenced by leading edge tubercle research. Carved from a 9" PG Nail fin.
The 5'8 has Liddle flex fins. 9.5 in the middle.
The dog is the Hound of San Quintin. Catahoula Setter. ;-)
[IMG]http://i145.photobucket.com/albums/r225/jonnyhedrick/IMG_0984.jpg[/IMG]
[IMG]http://i145.photobucket.com/albums/r225/jonnyhedrick/IMG_0977.jpg[/IMG]
[IMG]http://i145.photobucket.com/albums/r225/jonnyhedrick/IMG_0994.jpg[/IMG]
[IMG]http://i145.photobucket.com/albums/r225/jonnyhedrick/IMG_0990.jpg[/IMG]
Thanks to iShapes and the Wagon Wheel Crew.
Hail Liddle.
hey surferguy80. can you post a photo of the bottom contours on the red one? I’m interested to see how you transition the hull to single at the rail. do you have a tucked edge in the middle on the bottom? or is it a knife rail till the leading edge of the fin and then hard edge out da back?
the more I ride this design the more intriguing it gets. I sometimes get frustrated with it as it’s not as “maneuverable” as some of my other boards. but that’s why they call 'em, quivers right? you get different ones for different feels.from my 5’8" thruster all the way to the 9’6" log, they are all funboards.
I wanna hear more about this “trick “flow fin”, influenced by leading edge tubercle research. Carved from a 9” PG Nail fin."
Tell us more.
Hello!
I’ll do my best to explain…
Some time ago, I read about Frank Fish’s tubercle research concerning the hydrodynamic benefits of leading edge tubercles. Luckily, there was some high end testing done. Unfortunately, this was testing for level flight and things got REAL scientific. Too scientific for me, I admit! So back to… feel. Soon after reading all about the research, I started carving channels into some of my flex fins. I made big tubercles, small tubercles, less tubercles and more tubercles (tubercle term used very loosely). The one thing that I did notice about all the fins was the transparency I felt in trim. I felt less drag and I felt more “play”. The fin was able to move around in high speed flow better and more smoothly than a conventional fin. Too much input would be, um, terminal. When I let the board set itself up, I experienced a ride more akin to a finless feel and less drag. The board’s surfaces felt more accessible, yet it demanded more attention to detail. “Good” challenging, not “bad” challenging. Depending on the size and frequency of the “tubercles”, I could dial in what I wanted and came to some average conclusions for what worked best for me. I don’t feel like “tubercle” is the best description for these weird fins but “flow” fits pretty good. Basically what this type of fin does is “smooth” out the directional transition a fin makes when it moves through water. It will drift, like it’s stalling but it won’t bite back. You can push it through some extreme attitudes and still recover. One just has to feel out the parameters of the board and fin for a few waves.
Hope this sheds some light…
Hi djelem -
Your description compares favorably with fan blade testing done with tracers... better laminar flow at higher angles of attack.
I think this is thrilling research and application! I’ve spent some time conversing via email with a guy that is applying this tech to hydrofoils on his foil boards. He has sent me very detailed essays on tubercle research. If anyone would like for me to send them, just let me know. My conflict with the research and application centers purely around the humpback whale itself. It’s flippers aren’t formulated, exact structures and they vary quite a bit from animal to animal. This fact begs me to ask what the whale uses the tubercles for? What could they be used for on a surfboard? Fan and turbine tech needs exact design to perform as desired. Do we? So many variables in a wave; water flow, turbulence, time, the surfer… This is a new frontier. I’m wondering why more designers aren’t researching this! With a round file, and some sandpaper, one can start foiling and testing… One things for certain, tubercle fins are terrible when you’re surfing in kelp-infested lineups!!!
“The 6’8 has a trick “flow fin”, influenced by leading edge tubercle research. Carved from a 9” PG Nail fin."
djelem… i don’t see the tubercles on the fin in this pic… can you get and post another of it. flex fins are very thin, and i wonder how deep or pronounced the tubercles can be?
a good refreshing subject on this post. thanks.
-J
Here ya go. 9" PG Nail fin with "flow" channels. Crude, but serviceable.
[IMG]http://i145.photobucket.com/albums/r225/jonnyhedrick/photo-9.jpg[/IMG]
[IMG]http://i145.photobucket.com/albums/r225/jonnyhedrick/photo-1-5.jpg[/IMG]
The black paint is for aesthetics…I started seeing the broken up leading edges and went with it. I wouldn't consider this an example of a leading edge tubercle fin. Right now, my take is that surfing fins need to be "dumbed" down from a true tubercle fin. I've made a couple fins that more resemble the modified wings seen in the video and they are too maneuverable for a hull.
[IMG]http://i145.photobucket.com/albums/r225/jonnyhedrick/1935.jpg[/IMG]
It wasn't until I tried those fins that I realized how much of an impact fin drag made on how a board surfs. I never looked at a fin as a controlled drag feature before.
That being said, the nature of a tubercle fin is to move freely in higher angles of attack without penalty of a stall. Now, put yourself in a wave with a steep face and you'll find out that the board will take a different position. Certainly not a high line, unless the board can do it finless. Tubercled fins can move through water at a more oblique angle, so it makes it less ideal in some instances. The benefits I see as of now is that the application would be welcome on larger boards and maybe the center fin of a thruster.
[IMG]http://i145.photobucket.com/albums/r225/jonnyhedrick/IMG_0152.jpg[/IMG]
I've also used a modified 9" 4A on a 9'6 hull and my 4'11 spoon.
[IMG]http://i145.photobucket.com/albums/r225/jonnyhedrick/IMG_0138.jpg[/IMG]
At slow speeds, the fin is very "transparent", a feeling that the fin is on a caster. However, during a high speed bottom turn, the fin hooks up and starts to tighten up. It's a good feeling to me and it made my 9'6 much more maneuverable. It trims faster and I can break it out of a trim a lot easier. There is tail slide but with such a large board, it hooks back up when I let it. Sometimes I feel like it adds another point of articulation. Like when G.I. Joe got the swivel arm feature. :-)
[IMG]http://i145.photobucket.com/albums/r225/jonnyhedrick/Screenshot2010-05-28at30313AM.png[/IMG]
way nice, Djelem. i’m gonna give one a lash, see how it pans - no matter - sounds like may help on smaller days too.
i really like the flow diagram you put up too.
cool stuff Johnnie…
maybe I could be a team rider for the GI Joe model!!
roger
Thanks Gents!
9- make sure you draw lines on the fin and measure everything out so you can keep it symmetrical as possible. When I’d do it by eye, one side would be off angle from the other side. Something to look out for and prevent with some nice guidelines.
Rogelio- haha, GI Joe model…
I’d be glad to get you the 4A I did, I’d like to see what impressions you get from riding it, especially prone…
I’ll look for you when I get back in the city!
rogelio
Swell brings us together…
Nice pic!