Luddite
Michael Peterson status
Reged: 05/21/10
Posts: 2507
Loc: New Zealand
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Roy roughing out leading edge tubercules for a fin on his new 7-8.
http://olosurfer-woodensurfboardsatpipel...r-7-8-jets.html
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www.roystuart.biz @Roy_Stuart_NZ
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otf
Tom Curren status
Reged: 01/11/02
Posts: 11136
Loc: clownburg the OC
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Getting old is not for wimps ~ O.T.
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OOO
Grom
Reged: 09/13/03
Posts: 66
Loc: freaking in the circus
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Quote:
Roy roughing out leading edge tubercules for a fin on his new 7-8.
http://olosurfer-woodensurfboardsatpipel...r-7-8-jets.html
i've been using maori war clubs as fins since 1982.
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heelnipstr
Billy Hamilton status
Reged: 07/29/09
Posts: 1444
Loc: Southern Tip, Norcal
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"Disbelief in magic can force a poor soul into believing in government and business."
- Tom Robbins
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surf cat
Phil Edwards status
Reged: 01/14/02
Posts: 6860
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Check the rake on LeeDs' "Turbowl" fin
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lawless
Legend (inyourownmind)
Reged: 04/07/09
Posts: 222
Loc: ILM, NC
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The science behind the idea is sound, don't let the fact that the picture is of Roy blind you to the fact of some really interesting findings. It's already being applied to wind power -
http://www.whalepower.com/drupal/?q=node/1
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plural
Legend (inyourownmind)
Reged: 04/10/10
Posts: 193
Loc: poly ghetto
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why do you need improved angle of attack properties when all you do is go straight or is it to reduce the drag on an excessively thick rudder?
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Sporaticus
Grom
Reged: 11/30/08
Posts: 67
Loc: HoboPier, CA
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Quote:
Roy roughing out leading edge tubercules for a fin on his new 7-8.
Word is that the folks over at Swaylocks are impressed by how you've been handling yourself over here. Get registered up and go for it.
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I am Asparagus! --well sometimes or occasionally.
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Havoc
Tom Curren status
Reged: 09/10/07
Posts: 10000
Loc: The OC Life
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Quote:
why do you need improved angle of attack properties when all you do is go straight or is it to reduce the drag on an excessively thick rudder?
 go roy!!!
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"motions of rippage is initated by the hind leg"-Northern_Shores
"Lemme know. I got endson gas"-20W
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Luddite
Michael Peterson status
Reged: 05/21/10
Posts: 2507
Loc: New Zealand
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Quote:
why do you need improved angle of attack properties when all you do is go straight or is it to reduce the drag on an excessively thick rudder?
Firstly your premise is false, in other words Roy turns his boards.
Secondly the fin thickness is appropriate to the application. Roy uses fins which are both thinner and thicker than normal depending upon the application.
Thirdly yes the tubercules will reduce induced drag, as well as increasing lift and improving angle of attack capabilities.
Roy will post some more pictures when foiling is complete, what you are seeing is just roughed out.
.
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www.roystuart.biz @Roy_Stuart_NZ
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maynard
Grom
Reged: 02/24/09
Posts: 34
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Quote:
Quote:
why do you need improved angle of attack properties when all you do is go straight or is it to reduce the drag on an excessively thick rudder?
Firstly your premise is false, in other words Roy turns his boards.
Secondly the fin thickness is appropriate to the application. Roy uses fins which are both thinner and thicker than normal depending upon the application.
Thirdly yes the tubercules will reduce induced drag, as well as increasing lift and improving angle of attack capabilities.
Roy will post some more pictures when foiling is complete, what you are seeing is just roughed out.
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roy why do you keep referring to yourself in the third person?
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Luddite
Michael Peterson status
Reged: 05/21/10
Posts: 2507
Loc: New Zealand
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Quote:
Quote:
Roy roughing out leading edge tubercules for a fin on his new 7-8.
Word is that the folks over at Swaylocks are impressed by how you've been handling yourself over here. Get registered up and go for it.
Roy thanks you for the suggestion but will pass at present.
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www.roystuart.biz @Roy_Stuart_NZ
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rid
Gerry Lopez status
Reged: 11/20/08
Posts: 1068
Loc: Long Beach, CA
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Interesting concept. Again, just shows how common sense can be wrong.
more lift, less drag = yeah
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GDaddy
Phil Edwards status
Reged: 01/16/06
Posts: 7106
Loc: Carlsbad
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I've seen similar leading edge contours on some of Halycon's fins for a few years now. I doubt he's putting the extra work into them for the entertainment value.
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rid
Gerry Lopez status
Reged: 11/20/08
Posts: 1068
Loc: Long Beach, CA
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any pics of those?
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Luddite
Michael Peterson status
Reged: 05/21/10
Posts: 2507
Loc: New Zealand
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This tunnel fin uses leading edge channels which work on the same principle as the whale tubercules:
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www.roystuart.biz @Roy_Stuart_NZ
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Luddite
Michael Peterson status
Reged: 05/21/10
Posts: 2507
Loc: New Zealand
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Here's the plan for the new tubuerculed 'Zorb' fin for the Future Primitive 10'7"
http://olosurfer-woodensurfboardsatpipel...mitive-106.html
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www.roystuart.biz @Roy_Stuart_NZ
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Sporaticus
Grom
Reged: 11/30/08
Posts: 67
Loc: HoboPier, CA
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...
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I am Asparagus! --well sometimes or occasionally.
Edited by Sporaticus (05/25/10 09:18 PM)
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Coque
Miki Dora status
Reged: 08/18/04
Posts: 3709
Loc: Vigo, Galiza, Europe
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Coque sais this thread is as stvupid as it gets.
By the way, Coque just had a glass of water and now Coque is going to pee.
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www.worldprosurfers.com
Chano Ailans quiver:5'9 Basura Buceador,5'11 Vato Flyer,6'3 Pinche Photon
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Luddite
Michael Peterson status
Reged: 05/21/10
Posts: 2507
Loc: New Zealand
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Coque if you leave this thread and go back to Swaylocks the average IQ of both locations will increase.
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www.roystuart.biz @Roy_Stuart_NZ
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Coque
Miki Dora status
Reged: 08/18/04
Posts: 3709
Loc: Vigo, Galiza, Europe
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Quote:
Coque if you leave this thread and go back to Swaylocks the average IQ of both locations will increase.
.
I need to know if was you who wrote that or if was Roy...
Anyway, i'll tell Coque what you said...
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Luddite
Michael Peterson status
Reged: 05/21/10
Posts: 2507
Loc: New Zealand
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You don't need to know anything about Roy.
.
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www.roystuart.biz @Roy_Stuart_NZ
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afoaf
Rabbitt Bartholomew status
Reged: 06/25/08
Posts: 9846
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Quote:
Coque if you leave this thread and go back to Swaylocks the average IQ of both locations will increase.
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and so it begins...
so much for those 4 days and 18 posts of *good behavior*.
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(although I wouldn't put it past me to eventually have a quiver of Bonsais around the house)
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ifallalot
Duke status
Reged: 12/17/08
Posts: 17929
Loc: Carlsbad, CA
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Quote:
Quote:
Coque if you leave this thread and go back to Swaylocks the average IQ of both locations will increase.
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and so it begins...
so much for those 4 days and 18 posts of *good behavior*.
read the Tomo thread...
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The only two things in life that make it worth livin is guitars tuned good and firm feelin women
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SurfZombie
Tom Curren status
Reged: 06/29/04
Posts: 14195
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Quote:
Firstly your premise is false, in other words Roy turns his boards.
ZERO evidence exists of this.
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heelnipstr
Billy Hamilton status
Reged: 07/29/09
Posts: 1444
Loc: Southern Tip, Norcal
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Roy can definitively show evidence of the G-Forces he pulls while turning, with the device called an accelerometer. Although these devices come in many shapes, sizes, and flavors depending on the application, the principal of how an accelerometer works is not very complicated. The simplest example I can think of is to tie a piece of string to the hole at the bottom center of a protractor while tying a small weight to the other end of the string. Holding the protractor upside down, the string will hang at 90°.
 -works for me.
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"Disbelief in magic can force a poor soul into believing in government and business."
- Tom Robbins
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SurfZombie
Tom Curren status
Reged: 06/29/04
Posts: 14195
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That said, "Roy's" fin design isn't completely without merit.
I've been riding a similar set of twins on my Barry V fish (that djelem used to have, and have the same fins) for some time and the fins are twangy and super responsive. I like them alot.
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Anonymous
Unregistered
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Anonymous
Unregistered
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Fruitbison
Billy Hamilton status
Reged: 11/18/08
Posts: 1383
Loc: Vancouver
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Quote:
It is a design feature that should be explored IMHO. How it's applied is still up for debate and it should be explored the old fashioned way, trial and error. Those fins on BL's twin were stalling and I couldn't get the board to go vertical without stall, but when I put some of those tubercles on the edge, the fins would turn sharper without stalling. I kept those fins on the board until Bryan took it. (I miss that board) A year later, I started experimenting with tubercles again on my hulls and ran a 9" Greenough 4A with tubercles in a 6'6 Zamora Hull, it is a fin I'm very familiar with so I figured it would be a good test mule. I tested it the first time on a rather big day at Cstreet, a wave that isn't a friendly place for hulls. The fin's performance proved to me all the attributes that the scientific research provided. I noticed NO stalling in a hard turn, actually experienced an accelerated effect to the turn. I had to adjust my turning technique. The fin never washed out. I also noticed a significant reduction in drag while trimming along the highline. The board would take a more parallel line to the face. The board felt freer and it became free of the constrains I usually feel on a single. I felt like the entire board's planing surface was more accessible.
Remember back when you were a kid and would stick your hand out the window? When you banked your hand the wind would take it away and you'd feel the jerk of your muscles as you strained to get your hand back. With a regular fin I experience that same kind of feeling, once you change the attitude, the fin is on a destined path until the wind pressure subsides and control can be re-established. What if you could affect that destiny with more control, more access to the path that the fin is on? In essence, I think that this is what tubercles do to a fin. The leading edge is broken up so it can move more freely in high pressure enviroments. Now, back to your hand sticking out the car window, instead of making your hand like a wing, you would also stick your hand out with the fingers all pointing forward like Superman. You'd first curl your fingers and do this snaking motion, naturally you'd experience a smoother flow and more control. Get the picture? That is kinda what happens with a tubercled fin.
And that is a great explanation, Djelem. Do the tuberculed Greenough's have to be a special order, from Larry maybe ?
And how do you figure the size of fin for the board size ? Inasmuch as does it change the sizing ?
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Killer waves and beers?
I'm there.
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Havoc
Tom Curren status
Reged: 09/10/07
Posts: 10000
Loc: The OC Life
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Quote:
Coque sais this thread is as stvupid as it gets.
By the way, Coque just had a glass of water and now Coque is going to pee.
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"motions of rippage is initated by the hind leg"-Northern_Shores
"Lemme know. I got endson gas"-20W
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Luddite
Michael Peterson status
Reged: 05/21/10
Posts: 2507
Loc: New Zealand
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Quote:
Quote:
Firstly your premise is false, in other words Roy turns his boards.
ZERO evidence exists of this.
Bryan that's not correct. There is plenty of evidence of Roy turning his boards.
.
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www.roystuart.biz @Roy_Stuart_NZ
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Luddite
Michael Peterson status
Reged: 05/21/10
Posts: 2507
Loc: New Zealand
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Quote:
Hi Djelem, is that the same fin posted on magic seaweed placed way up the board on a roundtail 'hull'?
Thanks for the ride report.
Your tubercules lok nice but appear to have a few hard corners here and there, peraps some more smoothing would improve them and reap even more benefit ?
.
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www.roystuart.biz @Roy_Stuart_NZ
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SurfZombie
Tom Curren status
Reged: 06/29/04
Posts: 14195
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Quote:
Quote:
Quote:
Firstly your premise is false, in other words Roy turns his boards.
ZERO evidence exists of this.
Bryan that's not correct. There is plenty of evidence of Roy turning his boards.
.
Ive yet to see it in any of his ramblings over the past 5 or so years.
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kool-aid
Gerry Lopez status
Reged: 08/28/03
Posts: 1098
Loc: sf/sc
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I find it really hard to believe that under normal surfing conditions one would be able to asses 'viable' enhancements in performance with tubercles
Roy should be a perfect example of the shortcomings in 'perceptions' of 'reality' in terms of assessing performance under variable testing conditions.
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Luddite
Michael Peterson status
Reged: 05/21/10
Posts: 2507
Loc: New Zealand
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Quote:
I find it really hard to believe that under normal surfing conditions one would be able to asses 'viable' enhancements in performance with tubercles
Roy should be a perfect example of the shortcomings in 'perceptions' of 'reality' in terms of assessing
performance under variable testing conditions.
The performance advantages which Roy's boards have over other equipment are measurable and can be observed directly.
Regarding the tubercules, they have given a 20 percent increase in efficiency in wind turbines, if they do the same in surfboard fins it will definitely be noticeable.
Twenty percent is a huge increase in efficiency, as a perfectionist Roy looks for all efficiency gains even if they are less than 1 percent. . . they all count !
.
.
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www.roystuart.biz @Roy_Stuart_NZ
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Luddite
Michael Peterson status
Reged: 05/21/10
Posts: 2507
Loc: New Zealand
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Quote:
Quote:
Quote:
Quote:
Firstly your premise is false, in other words Roy turns his boards.
ZERO evidence exists of this.
Bryan that's not correct. There is plenty of evidence of Roy turning his boards.
.
Ive yet to see it in any of his ramblings over the past 5 or so years.
What a load of BS you've seen plenty of video of Roy's boards being turned, as well as pictures of them turning.
Turning is a technical term perhaps you are confusing it with a particular style or bodily posture ?
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www.roystuart.biz @Roy_Stuart_NZ
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SurfZombie
Tom Curren status
Reged: 06/29/04
Posts: 14195
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Quote:
Quote:
Quote:
Quote:
Quote:
Firstly your premise is false, in other words Roy turns his boards.
ZERO evidence exists of this.
Bryan that's not correct. There is plenty of evidence of Roy turning his boards.
.
Ive yet to see it in any of his ramblings over the past 5 or so years.
What a load of BS you've seen plenty of video of Roy's boards being turned, as well as pictures of them turning.
Turning is a technical term perhaps you are confusing it with a particular style or bodily posture ?
.
I'm sorry. I must be.
Do you define turning as "squatting like you're taking a poop and going straight down the line?"
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patrolman
Michael Peterson status
Reged: 07/28/05
Posts: 1802
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Hey Roy. Some of the less intelligent than you folks over at sways are experimenting with the idea, which is not yours really. I find this iteration much more interesting than yours.
http://www2.swaylocks.com/forums/line-and-fin-designat-last
As far as your boards turning, well if you consider slight weighting and unweighting, barely dsicernable rail to rail shown in the following clip to be turning, yeah they turn. But if you're like me and you find the most enjoyable maneuver to both perform and watch is the full rail, carving roundhouse cut back, then no, your boards don't turn.
As far as speed, I like how that knee board leaves you in the dust at about 1:19 of this clip of the $30,000 surfboard.
http://vimeo.com/11259898
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ifallalot
Duke status
Reged: 12/17/08
Posts: 17929
Loc: Carlsbad, CA
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I was watching the video but the music almost instantly put me to sleep, its very relaxing
btw, I see no maneuvers from that board that all other planshapes could do better
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The only two things in life that make it worth livin is guitars tuned good and firm feelin women
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