Facebook posts: Bill Wurts

What works and what doesn't. Share design ideas, references and contacts for paipo board builders.
User avatar
bgreen
Big Wave Charger
Posts: 1394
Joined: Fri Aug 19, 2011 5:17 pm
City: Brisbane
State or Province: Qld
Country: Oz
Contact:

Facebook posts: Bill Wurts

#1

Unread post by bgreen »

23 July 2023

https://www.facebook.com/groups/paipobe ... 785555080/
Wurtz23Jul23.jpg
Conrad Elliott
I’ve made one of those in paulownia with a big single concave’ goes like hell but it needs to be punchy surf.

Bill Wurts
Used these in 2-4 ft, spilling to plunging waves. At 22” wide X 48” long, they catch waves easily. Flat, rectangular planing surface is 18” wide. With a flat, rectangular bottom they go fast.

Conrad Elliott
yeah it was good haven’t used it for a while have to wait for some good surf and use it again. I’m a bit obsessed with the kneeboard at the moment.

Bill Wurts
This is kind of a kneeboard/bodyboard hybrid. It has a lot of volume at 3” thick, which I like. The planshape outline is derived from a slightly modified 5-5 Lis Fish template. Planshape was derived using a 40:60 (front:rear) length distribution around the wide point. Low res phone camera photo of chamfer bottoms, with and without channel. Phone angle distorts image shape outline.

Thomas Haugh
Definitely on the right track with Lord's planing hull aspect ratio ideas. Sims took Lord's ideas and added the bottom rear exit concave to relieve the bottom pressure Lord described. He also added twin fins. These original ideas are all circa Late-40s to Early-50s. Standing on the shoulders of giants...

Bill Wurts
The channel is designed to create low pressure (suction) — basically a low drag (finless) fin. Bob Simmons was a true innovator.

when you relieve “high pressure “ you create “low pressure “. Low pressure reduces friction and consequently increases speed. “Suction”, in my opinion, would increase friction.

Bill Wurts
I believe the relative drag of the channel is much lower than that of a fin. The orientation of the channel curves has minimal disturbance on the boundary layer. The channel holds the tail to the surface of the water — draws water into the channel — for directional control (tracking).

The cross-sectional flow area of that channel increases as the sidewalls flare outward and depth increases -- both in a rearward direction (while remaining recessed). This causes the static pressure to drop, drawing water into the channel without causing substantial drag effects. The channel avoids form drag and flow separation. The channel increases the flow rate of water through it while not disturbing the boundary layer.

Larry O'Brien
Soft board materials?

Keith Usher
have you surfed it, did it "work"

Bill Wurts
Have ridden it in 2'-4' spilling and closeout plunging waves. Caught waves easily. Felt fast. Seemed to hold the brief unbroken sections of closeout wall well. No problems tracking transversely in front of the whitewater. Hope to get a better idea of performance at the Bodyboard event at the Waco wave machine in October -- consistent size and form.

Keith Usher
"spilling and closeout plunging waves" that's some new surf lingo on me!

Bill Wurts
From oceanography terminology I guess (I'm a retired aquatic scientist). Spilling = top tumblers (mushy). Plunging = pitching, steep wall, hollow. Closeout is standard surf meaning -- whole wall collapses nearly simultaneously.

Bottom Chamfer Blank
Wurtz23Jul23b.jpg
Wurtz23Jul23b.jpg (14.25 KiB) Viewed 247 times
19 October 2023
https://www.facebook.com/groups/paipobe ... 265650080/?
Wurts19Oct23.jpg
Wurts19Oct23.jpg (103.66 KiB) Viewed 243 times
Damian Coase
Nice little pocket. Don't be a clone, ride prone, where every wave is overhead.

Keith Anderson
yep and expectations not as high👏👏😊😊🔥🔥🐌🐌

Tony Ahrens
I know that dude pretty well

Bill Wurts
We got along pretty well. Very focused but a free spirit — traveling extensively in a RV with his Doby. Several inches over 6-feet tall.

Tony Ahrens
I know I sold him that RV at the wedge in California

Chad Stickney

20 October 2023

https://www.facebook.com/groups/paipobe ... 576330080/
Wurts20Oct23.jpg
Wurts20Oct23.jpg (103.09 KiB) Viewed 243 times
Bob Green
It holds in the pocket well

Bill Wurts
The design objective was/is a finless fin.

Next model will be the twin channel.


30 October 2023

https://www.facebook.com/groups/paipobe ... 715535080/
Wurts30Oct23.jpg

Bob Green
Looks like the rider should have been kicking hard to get into it rather than waiting to be picked up by the lip.

Bill Wurts
The rider is me. And Yes. The take-off is strange and very specific. All of my surfer instincts fought against the correct method. I’m too used to facing the oncoming wave and spinning at the right moment. To top it off, I was borderline hypothermic — daytime highs in Waco, TX should have been mid-80s on 10/15/2023.

Keith Usher
what temp was it, they declared a yellow weather warning for high temps here in ireland this summer and it was 80f that day. You don't have a hard rail on a mat to drive across a steep wall like that.

Bob Green
I think the board might be like this one - https://www.facebook.com/groups/paipobe ... 785555080/

Bill Wurts
Close. It's made from 6-pcf XLPE. The board is like this one (below) with rounded top rails to around 42% of board thickness. Also rounded top and bottom edges of the nose section in front of the chamfers.

There were 66 days above 100 F (29 consecutive days) in Waco, TX this summer (2023). Highest temp was 110 F (25 August 2023).
Temps for both morning sessions in Waco were 46-52 F (10/15-10/16) with strong, gusting north winds — sudden unseasonable cold front upon arrival. Pretty much the same for the 6-9 pm evening sessions.
Daytime highs are normally 80-85 F for Waco, TX in mid-October. That’s what I came prepared for (brought a 1.5 mm, sleeveless shortie and a neoprene sweat vest in case air temps were in the lower 70s).
That’s not a mat. It’s my channel-tail, chamfer-rail XLPE prototype. This prototype can hold a wall (second wave in video).
https://vimeo.com/876106440
Chad_Stickney_Tube

Keith Usher
interesting read of their website that the water temp there unlike the sea seems to be drastically/quickly affected by air temp. Today it's reading 60f water temp, which I would be cozy in a 3/2. I dont know what your 46/52 day brought the water temp down to but if it was in the air range that's 5/3 6/4 territory!

Bill Wurts
Basically the wave/surf pool is a shallow pond (around 0.5-1.0 ha). Shallow ponds cool down fast — especially with strong wind and continuously breaking 4’ waves. I believe Jay Reale was wearing a 4/3, chest-zip, full suit (no hood). After I got out of the water, I put on a winter ski jacket, over a polar fleece vest, over a long-sleeve thermal shirt; wearing sweat pants over cotton shorts. I was still shivering. The cold, gusting, strong north wind was the most brutal factor.

Keith Usher
it must have been cold for Jay to have a 4./3 on, he has very low body fat, and I have seen him using a 5/3 and hood in cali water i would be happy in a 3/2 all day.


1 December 2023
https://www.facebook.com/groups/paipobe ... 165575080/
Wurts1Dec23.jpg
Wurts1Dec23.jpg (37.35 KiB) Viewed 243 times
1 January 2024
https://www.facebook.com/groups/paipobe ... 348435080/
Wurts1Jan24.jpg
Wurts1Jan24.jpg (57.45 KiB) Viewed 243 times
My interview with retired Pro-Bodyboarder, Jay Reale, at Waco Surf (10-16-2023). You may need to crank up the volume some.
I recommend viewing it in "full-screen" mode.
Jay_Reale_Intvw_Waco-10-16-20223

Bill Wurts
42- and 48-inch variants of the Lindsay Lord Hybrid concept -- with my Coanda Channel.
Wurts4Jan24.jpg
John Morris
with your scientific approach, have you ever considered recreating. the Lord experiments? As I recall, his strain gauge and flow tank contraption was quite simple and the 'hulls' he used were likewise non-complex. The 2 hulls pictured above appear to have pretty different width vs length ratios.

Keith Usher
The lord experiments worked out what had lease resistance/drag in a straight line, (or was that Simmons) but as surfers we also want to turn. The more you make a perfect lord board the less it wants to turn, so it is all about how much of what you want in your pie!

John Morris
his 'hulls' had no curvature: straight, flat bottom, parallel, square rails, blunt front and back. His findings are often cited, but it's not clear to me how applicable they are. So I wonder what an updated set of tests with some hull shape would reveal.

Agreed, but look at the variety of hull shapes out there. It certainly appears that there's no single design element that's essential for a board to perform.

Bill Wurts
Bodyboard hulls are intended to be flat in the rear section — nose kick only. The Coanda channel has to be within a flat surface. Will not work within a tail rocker curve. Width is the same — planing surface and board — for both boards pictured (and they measure the same in the photos), mostly just optical illusion from the different lengths. Planing surface aspect ratios are about 0.4 and 0.46 for the 48” and 45”, respectively. Would love to test but don’t have boat, tension gauges etc. I’m fairly certain the Coanda Channels will alter the Lord planing performance relative to the same boards without the channels.

The difference is, I added a parallel edge planing surface while maintaining more traditional Lis Fish or bodyboard curves in the planshape. Curved planshapes allow the rider to set a rail/keel. The Coanda Channel holds the bodyboard tail and hull in the correct position on the wave, allowing the rails to engage for better tracking and turns. Rail profile also adds Coanda Effect.

John Morris
First I've heard of 'Coanda Channel'. But my first two paipos had trouble holding on a steep face and too much volume overall. They also had near zero tail rocker. So I modified them with an 'escape hatch' which I think is Matt Biolos' name for the feature . Mine were relatively shallow and in cross section created a Vee. One had straight sides, the other was curved like yours. I believe they helped with hold and other aspects of the boards' handling.

Bill Wurts
The “Coanda Channel” is my patented creation — designed around the ‘Coanda Effect.’ The Coanda Channel (CC) bottom surface is flat but curves toward the deck, creating indirect tail rocker within the channel. The sidewalls and bottom of the CC create an area of low pressure in the tail, holding the tail in proper orientation to the wave — finless fin. The boards pictured have a lot of volume at 3” thick and planshape 22” wide. CC max depth is 1.75”.

Bob Green
https://www.reddit.com/.../ryan_burch_l ... _video.../
From the surfing community on Reddit: Ryan Burch Lord Board Video. For the hipsters in the sea.

Keith Usher
Ryan did hardly any shaping on that block of foam. I surfed with him in G-land and took this video of him, a could of waves later he snapped it.
Usher4Jan24Lord.jpg
Usher4Jan24Lord.jpg (9.98 KiB) Viewed 243 times
https://www.youtube.com/watch?v=tpLuOB-T6Ls...
Ryan burch G land

Bill Wurts
The catalyst for my Coanda Channel was a tail channel I saw on Swaylocks in 2010 (photo below; Mike Daniel ~ 1990). Mike mentioned a shallow draft boat hull that had a similar concept. (Many years later I saw that concept in ”tunnel hull“ Jon Boats.)
After a few years of internet searching, I discovered the Coanda Effect.
Learning about the Coanda Effect led to my first Coanda Channel design. https://forum.swaylocks.com/t/less-fins/47777/85
Wurts4JanDaniels.jpg
Wurts4JanDaniels.jpg (11.53 KiB) Viewed 243 times
Bob Green
His surfing ability makes riding it look easier than it would be. Prone would likely be easier than standing - just shows you can surf just about anything.

Keith Usher
I have a subtle open single channel on my own board.

Bill Wurts
After I built my first Coanda Channel, I discovered there was also the Bing Auga around 1969/1970.



Bill Wurts
https://forum.swaylocks.com/t/lindsay-lord-hybrid/78725

Keith Usher
"Agreed, but look at the variety of hull shapes out there. It certainly appears that there's no single design element that's essential for a board to perform." "Perform" is an interesting concept in surfing. Its not like we have a lap time to see which is the best-performing racecar. Every board I have ever ridden will get me along a wave. But until you ride a better one you really don't realize how bad another is actually performing. The design elements for what goes into a shortboard for a Pro Surfer and now pretty narrow. (performing to me is moving/turning to the part of the wave I want to be with the least effort/struggle, on high-quality waves)

John Morris
I'm with you. I stopped shaping my own boards after 20 or so after I rode a couple that worked so much better. Of course, the shapers of those boards were shaping more in a week than I did in my 'career'. My boards need to perform like yours only in medium quality waves and with an old battered body.

Bill Wurts
Pretty sure the video is too long to direct load into FB. I can probably upload it to YouTube but with some loss of image resolution.

Bill Wurts
On Youtube now. Use full screen mode. Adjust volume: https://youtu.be/z6gWiWJ0X_A?si=d47f7FwUUkOU7rnv
Jay Reale Intvw Waco 10 16 2023

Keith Usher
did he have a go?

Bill Wurts
Nah. A member of the group suggested it. But the look on his face suggested to me that he likely viewed the suggestion as an endorsement of my design — he has his own BB line. My comment about his response sort of gave him an out.

Keith Usher
It was my boredom with the lack of new designs in bodyboarding that led me to Paipos 10 years ago to give my own ideas a go. bodyboards all come out of one factory in Indonesia and the Line he made is just stock boards from that factory. (it's probably a much better profit margin for him than selling other brands boards so adds to his business) The pro bodyboard design is very well honed and has been for 20 years so with its construction limitations it not really got many places to go, the same as the standard 5.10 performance competition stand-up board It does amaze me people's disinterest in trying something new though, i once bumped into Ryan hardy (pro bodyboarder) in indo and we had a board swap. He gave my board a good go and seemed generally interested. but in general when a bodyboarder in the water with me has asked about my board when offered the chance at a board swap for a couple of waves most have declined.

Bill Wurts
Because it was so cold, I gave Chad Stickney a good bit of my riding time. As a result, he offered to ride my 42” board for me. After the first few rides, he came back enthusiastic, saying that he caught 3 tubes and that it rode good prone. Vicki Reale caught one of those rides on video. And Tony Prince shot a great still photo of Chad “covered up.”. As with surfboards, it’s my observation that BB design has become variations on the same theme. I think BB construction tech has pretty much stalemated the evolution. Standard, modern surfboard design software and CNC shaping machines were unable to design and cut my channel. A gifted garage CAD designer I met on Sways was the only one who could do the CAD work and also did the first successful CNC cut. Only 2 of around 20 CNC shaping companies I contacted could make a clean cut of my channel, chamfers and planshape. However, I have since invented a ”3-piece blank technology” that allows very accurate hand-shaping of the Coanda Channel. My planshape evolved from the Lis Fish kneeboard planshape. I wanted a hybrid bodyboard-kneeboard concept. If I live long enough, I plan to make (or have made) a “finless Fish” with my channel in it.

Keith Usher
Bill Wurts What I would do next is shape an identical board without the channel so to can ride both and compare. What are you trying to gain with this design? Also if you want CNC go to https://www.facebook.com/L41Surfcraft/ he was a CNC machinist before they were ever used on a surfboard and pioneered their use
L41 Surfcraft
User avatar
bgreen
Big Wave Charger
Posts: 1394
Joined: Fri Aug 19, 2011 5:17 pm
City: Brisbane
State or Province: Qld
Country: Oz
Contact:

Re: Facebook posts: Bill Wurts

#2

Unread post by bgreen »

Bin Augur board
Wurts_Augur.jpg
Wurts_Augur.jpg (11.12 KiB) Viewed 242 times
11 February 2024
https://www.facebook.com/groups/paipobe ... 003265080/
Wurts11Feb24.jpg

Rod Treece
Hi Bill, I like the Shape / Channel . My bottom has a similar yet much less dramatic cut / depth to it and follows al the way through the board. From what I know about designs and patents it would have to be copied exactly to be an infrengment and then the legal fees to enforce it could be extensive. Good job on it !

Bill Wurts
Thanks for the kind words. I've been through the patent process several times. Doesn't have to be an exact copy, especially if the claims are broad enough. Also, with two or more related patents, each individual patent becomes much stronger. My original objective was/is licensing and royalties not production/sales. (Licensing/royalties are typically substantially less costly than litigation, for all parties). My patents are available for public viewing at the USPTO website (numbers in figure above). BTW do you have a picture of your bottom channel?
Wurts11Feb24b.jpg
Wurts11Feb24b.jpg (69.79 KiB) Viewed 242 times
Bill Wurts
I’ve seen those. Other than being full-length, that is more like the Surfboard “Torus Channel.” I believe there was a similar Viking Surfboards bottom design called the “CAT Bottom.” A bit like a Venturi Channel also.
There was the late 1960s Bing Auga:

Joe Abella
Yeah, Auga Boards on Maui in the mid-70s with the Bingham Bros.

Bill Wurts
Larry O'Brien, This Mike Daniel channel from 1990 inspired me. And eventually, I discovered the Coanda Effect. (Mike and Bing got close but missed the next level of evolution.) https://forum.swaylocks.com/t/less-fins/47777/85
LESS Fins!

Larry O'Brien
I have nineties era fiberglass bodyboard made by Insanity Surf Gear of San Diego. A shallow tail channel inside of a wider channel that created the drop rails. I never got it water tight to test ride it, but I kept it because it was sort of unique. Insanity boards were often twin fins.

Frank Silva
I've always loved single concaves on the bottom of my boards
How does this work?

Jarrett Liu
Unbelievable!! Can’t wait to see this board in the water🌊🌊🌊🌊 videos

Bill Wurts
Here, easier to just post the video twice (2nd Wave): https://vimeo.com/876106440
Chad_Stickney_Tube

Jarrett Liu
wow, stable in small surf. How well would it be if surfed in a bigger surf conditions since by watching this video clip?

Bill Wurts
That I cannot say with any certainty. I suspect channel dimensions would likely have to change with velocity, and as a result, with wave size. I suspect with proper depth and aspect ratio, the channel could work well in large surf. 🤙

Jarrett Liu
mahalo for sharing n keep it coming 🤜🏽🤛🏽

Chipper Ben
yay ! SWAYLOCK'S days ! good times , good creative minds !

Bill Wurts
Sways is back up and running again. 🤙

Done in 6-pcf XLPE, 42- and 48-inch variants of my Lindsay Lord Hybrid concept (with my Coanda Channel).

Jim Kelly
People been channeling boards for long time. Can't stop em

Bill Wurts
There is always a better channel and a new design.

Mike Jax
people should keep posting their boards with channels.... all of them.

Bob Green
I'm surprised that you got a patent. The board itself s features with other boards. Who is on the onus on to prove a design does or doesn't breech a patent - you or the other party? Could prove expensive, either way.

Bill Wurts
Not sure what you mean by the “board itself“ s “features.“ That I got two (2) patents after the federal examiners did extensive searches of prior art and previous patents of recreational watercraft channels, suggests my claims for the “channel” are unique. The “channel” function/parameters/applications are what are patented, not the “board.” The patents are available for public viewing at the USPTO website, anybody can see what is “claimed.”. Litigation depends on whether it is an infringement or whether it is a challenge — both parties pay attorneys. I spent a lot of time, effort and money developing and building this technology. It is not unreasonable to want protection from people who seek to “profit” from my Ideas (intellectual property) after the fact. As I mentioned to Rod Treece, “My original objective was/is licensing and royalties not production/sales. (Licensing and royalties are typically substantially less costly than litigation, for all parties).”

Bob Green
Ok, that makes sense as the board shape is not dissimilar to a standard bodyboard. I also know someone who has been using a two piece method for making channels in boards for many years. I had a quick look at some of the patents you cited and it would seem that you are patenting a very specific form of channel and construction method as unique. It will be interesting to see how it pans out.

Bill Wurts
I did not attempt to patent the Lindsey Lord Hybrid concept — don’t plan to. The second patent (11,649,013) is for a “3-piece” blank, channel fabrication technology. I had been waiting for this second patent to be awarded before attempting to license the channel technology. Do you have links to the 2-piece blank method for channels that you mentioned?

Bob Green
No wesbite but a photo

Bill Wurts
That is the “horizontal plate“ fabrication technology used to make the channels patented by Steffel (1963) and Merkley (1963). That tech doesn’t work well for shaping the contours of my Coanda Channel. My 3-piece blank tech uses vertical blank sections (bonded with vertical seams that are perpendicular to the horizontal plane).

Tech foil
25 March 2024
https://www.facebook.com/groups/paipobe ... 476565080/

4 April 2024

https://www.facebook.com/groups/paipobe ... 928645080/
Wurts4Ap24.jpg
Bill Wurts
https://forum.swaylocks.com/.../coanda-channel.../79794


22 April 2024
https://www.facebook.com/groups/paipobe ... 655890080/

Wurts22Ap24.jpg
Wurts23Ap24.jpg
John Morris
Mislabled? 'Front' looks like 'Right' to me. Hidden lines available for 'Top' and side view??

Bill Wurts
I added the bottom view figure to the original post above. Blue line = planshape. Red line = deck rail radius boundary. Green-Brown (between Blue and Red) = bottom chamfer. The planshape curve still needs a little cleanup at the widepoint.

Definitely mislabeled by my CAD guy. Front is Side. Right is Rear. This is the latest that was sent to me — derived from my data. Don’t know about hidden lines for top and side. Did send me a PDF bottom view with representative top and bottom lines. I can convert it to JPEG and post in a bit. (Answering your question about tracking at the moment,)

This link discusses the history/evolution of the Surfcraft Coanda Channel: https://forum.swaylocks.com/.../coanda-channel.../79794
Coanda Channel Technology
Wurts23Ap24c.jpg
Wurts23Ap24c.jpg (45.67 KiB) Viewed 242 times

Final CAD file looks good:

Twin Channel Design (completed):

John Morris
Is it my imagination or is the shape getting better? I'd vote for a few less straight lines, but what do I know?

Bill Wurts
Yes planshape has improved a bit. Will only need some 150-grit fine tuning with a couple passes from my truing sanding block. I developed a technique for getting precise widepoint placement. After some phone calls, I finally got my CAD guy to use my method. Except for the deck-rail radius, every curve in the design comes from one (the same) equation-based curve. There are only two (2) straight lines in the planshape — nose leading edge and tail edge. IMO pointed noses are only good for causing spear-point injuries. Tail rocker has to be flat for the channel(s) Coanda Effect to work properly. The channel bottoms provide indirect tail rocker.

John Morris
for spin and go take-offs I hook the ‘point’ of a Crescent tail or Fish tail against my hip to get quickly turned around. At the nose, maybe it’s only aesthetics, but there are very few straight lines in a wave. I agree that the fewer points the better.

Bill Wurts
Wide square tails have corner points and give channels more critical widepoint, channel bottom at the exit. It has been my observation over the years that the only time the nose is in the water is while pearling and duck diving. With shorter boards, body weight distribution keeps the blunt nose out of the water. For shorter board late take-offs, I usually use a leg spin with body-roll-pull-down motion. This nose and planshape appeal to me:

John Morris
Your technique sounds next level. I'll have to try that with one of my low flotation boards. Adding to my : On a surf safari to meet up with friends last winter I had to find a way to get waves despite the line-up being full of longboarders who knew the break better and weren't interested in sharing the sets. This wave would start to peak, then back off before standing up as the bottom dropped out. Longboarders were gliding in early and setting up for the critical walls. A couple of times I succeeded in getting in early by doing a shallow duck dive just before the bottom dropped out and catching the energy semi-submerged. It took timing and it must have appeared that I was pearling and not gonna make it 'cuz I got dropped in on. No fun riding behind a longboard at a ledgey beachbreak. I went out and bought a helmet when I returned home.

7 May 2024
https://www.facebook.com/groups/paipobe ... 558160080/

Wurts7May24.jpg
Wurts7May24.jpg (50.64 KiB) Viewed 242 times
John Morris
More width forward than I realized.

Bill Wurts
I believe this 4’7” template was one of Steve Lis’ originals. Lis made it for knee boarding. As the story goes, he later made a 5’5” version for his friend Jeff Ching to ride stand up. And the rest is history.
You can always move the wide point:
http://bgboard.blogspot.com/.../moving-widepoint-of...
Moving the Widepoint of a Surfboard Template


John Morris
4'7" is much shorter than most kneeboards I've encountered.
Wurts7May24b.jpg
Wurts7May24b.jpg (76.56 KiB) Viewed 242 times

Bill Wurts
Lis was a kneeboarder. Apparently he made it to suit his preferences. https://www.surfer.com/blogs/shaper-hal ... -steve-lis
Shaper Hall Of Fame: Steve Lis

However, Lis was 16 at the time.

Bill Wurts
BTW retro Fish shapes typically have some vee in the tail.


3 June 2024
https://www.facebook.com/groups/paipobe ... 252495080/
Wurts3June24.jpg
Nick Worsfold
what is it made out of ? foam

Bill Wurts
From 6-pcf XLPE (cross-linked polyethylene), 3” thick foam slab starting thickness.
May be an image of ‎measuring stick and ‎text that says "‎ا 3 Mitwaukee 2‎"‎‎

Nick Worsfold
the square shape bothers me ..the front should have a gentle radius

Bill Wurts
With tail width at 18” and wide point 22” (21”-22”), you can shape the nose however you like.

Chipper Ben
is it my imagination or is the board bent at maybe 60 degrees or so , in the first picture ?
or maybe I just SHOULDN'T ' have gone to Specsavers ' , eh ?! 🤔💥

Bill Wurts
No 60 degree bend anywhere. Nose rocker is 14” long x 1.75” tall. Tail rocker is flat. Channel bottoms are indirect tail rocker.

David Tomasetti
Are you going to get a chance to ride it at any point Bill?

Bill Wurts
Author

David Tomasetti Depends on offshore weather patterns in the Gulf of Mexico Next week. Unfortunately, for this prototype, shipping from the shaper won’t get it to me before I leave. I’m going to have to start taking regular surf trips to the far south TX coast at the right time of year…

David Tomasetti
best of luck to you with the weather and the trip.

Bill Wurts
Got shut out, 0.5’-1.5’ closing out on the beach.

David Tomasetti
that sounds like what happens anytime I take time off from work to surf..
but now I neither work nor surf

Bill Wurts
This Twin Coanda Channel planshape is a modified Retro Fish mid-section. [The first Retro (Lis) Fish was built in 1967. The first Boogie (SNAKE) Board was made in 1971 — looked nothing like its descendants.] All curves in this prototype, except the deck rail radius, are derived from the same equation. The principal (channel-wall flare) equation is derived from a basic fluid mechanics curve. I find no use for flesh piercing points and foam that isn’t in the water for more than a few seconds. A few more photos at this link. https://forum.swaylocks.com/.../coanda- ... ./79794/12

20 August2024
https://www.facebook.com/groups/paipobe ... 138380080/


Rick Slager
I’m interested in hearing peoples ideas on this as well

Roger Harrell
Mine have no rocker
5'1" 4'10.5 5'5
All shaped from a 68RP with 2 ft cut off the nose
At 75 I only go out on small days and I arm paddle only
May be an image of surfboard

John Morris
I'm not shaping my boards these days. I've been happy with the 5' (60") paipos Steve Pendarvis makes for me. I measured one of them and will try to express clearly what I found. I've got a template taken directly from a modern/traditional Donald Takayama 10 footer (not a noserider). I found that from 18" back to 30" back from the nose their rocker is identical. Comparing the area forward of the 18" point, the Pendarvis gains 1 1/2" more rocker. Rocker from the nose to 30" back measures 3 1/2" for the Pendo compared to 2" on the Takayama. Confusing?
May be an image of surfboard

Richard Mendonca
Mine have nose rockers between 1.5” - 2”. However I make mine based on the waves I wanna ride. I have a friend who rides big waves and his nose rockers are about 4”+. I also have friends who ride boards with almost no rocker in em.

Rod Rodgers
My boards genearlly have slight through-rocker, but is usually focused up within 12 inches of the nose. The tails tend to be flatter except a board or two with some tail kick for wave catching and turning.
Post Reply

Who is online

Users browsing this forum: No registered users and 0 guests