Is 4 " of rocker in the nose too little for a 12’ paddle/surfboard? Not trying to make a living as a pearl diver. Seen @ 6’’ on some. HBS (hollow bamboo surfboard). It’ll be heavy, and I’ll trim the fat where I can. Any help is appreciated.
Ummm… yes. In my personal experience I would think that is too little by quite a large margin if you plan to try to surf it. It would paddle quite well I would imagine. My POSSUP had about 5’’ and it is very difficult to surf (for me) although not impossible.
We use 6 to 7 inches.
.
theboys, tombloke,
thanks for the input, looks like its time for plan b.
I have a Clark Foam catalog from Oct 2005. The closest thing is a Velzy/Downing tandem blank. 12’ 3" with 5 3/4 nose rocker. I think you need more but I’m not doing the stand up paddle thing
Ray
I spent several days laying out the rocker for my 12 foot styro surfing EPS blanks. Surfore got the first one and thinks that it may have too much nose rocker.
I used all of my existing 11’3" rocker sticks to start with, but in stretching less than a foot, it became really distorted along the bottom.
I finally used the Downing Hawaii tail rocker for the nose, spun it around to duplicate for the tail, but could see that after tuning the bottom it was going to have excessive tail rocker.
I went for the natural 11’3" tail rocker and this gave the bottom a really clean line from nose to tail. The profile is only 3-7/16" before shaping, so it lacks the super thickness that the 12’3" and 11’3" had, I wasn’t concerned what the deck line was, only the bottom
If it is of any value, you may want to look at my web page where there ar boards from 10 ft to 14 ft showing the rocker templates. These templates are designed by well established shapers with many years of experience and are designed for a variety of applictions from lay down paddleboards, stand-up paddleboards, “Big Guy” boards and tandem boards. Hopefully this will be of some value in your quest… www.segwaycomposites.com
Cheers!!!
Ken
Thanks for the info, looks like figuring the rocker is going to be muy importante.
Thanks for the link, glad there are multiple options. Definitely gonna help me figure it out. Thanks.
You didn’t offer any rocker measurements, so what was the point of your post ?
Oh, I thought I would get on here and waste.
everyones time with worthless banter.
I NEVER measure rocker, it is only numbers and in the wrong hands is a dangerous weapon.
Lofting it out first lets me see around the bottom curve and get a view of how it will first enter the water, secondly, glide along the water and how the rocker in the tail will work for the turns that I have in mind for this particular board. All the numbers in the world don’t mean a thing if it isn’t proportional.
Surfore, how does this board work? I mean paddle well, move through the water with ease?
Catch waves? Turn easily? Noseride? It has about this much nose rocker and about that much tail rocker
Here’s the formula for a table of offsets to loft a perfect circular arc rocker for a 12 foot board with 7 inches of rocker:
For each degree of arc angle ‘p’ the coordinate is:
377.3 (1-cos p ) = Height of rocker above apex, in inches
377.3 (sin p) = Length of rocker from apex, in inches
Start from zero degrees and solve for half degree steps up to 11 degrees
If you don’t want to loft this particular curve using coordinates then it can be drawn with a wire and pencil compass using a radius of 377.3 inches
The formula for calculating the table of offsets for any circular arc rocker (or circular arc planshape curve) is:
1-cos q = C sin q, where C = Rocker depth /length of curve
then
R = Length of curve/sin q
then,for any given degree of arc ‘p’
R (1-cos p) = Height of rocker curve
R (sin p) = Length of rocker from apex
Circular arc rockers are LOVELY. . . especially in the tail !
Here’s the table of offsets for a circular arc rocker for a 12 footer with 7 inches of rocker
Station Rocker depth (inches) length along baseline (inches)
1--------------- 0.0 ---------------------0.0
2 ---------------0.0 ---------------------3.3
3 ---------------0.1 ---------------------6.6
4--------------- 0.1 ---------------------9.8
5--------------- 0.2 --------------------13.1
6 ---------------0.4 --------------------16.5
7 ---------------0.5-------------------- 19.7
8 ---------------0.7 --------------------23.0
9 ---------------0.9 --------------------26.3
10 --------------1.2 --------------------29.5
11 --------------1.4 --------------------32.9
12 --------------1.7 --------------------36.1
13 --------------2.1-------------------- 39.4
14 --------------2.5-------------------- 42.7
15-------------- 2.8 --------------------46.0
16 --------------3.2 --------------------49.2
17 --------------3.7 --------------------52.5
18 --------------4.1-------------------- 55.8
19 --------------4.7 --------------------59.0
20-------------- 5.2-------------------- 62.2
21-------------- 5.7---------------------65.5
22 --------------6.4 --------------------68.7
23-------------- 7.0---------------------72.0
.
.
Quote:
Surfore, how does this board work? I mean paddle well, move through the water with ease?
Catch waves? Turn easily? Noseride?
Sorry I’m more of a lurker than poster these days…
I’ve ridden it at head high Malibu and SanO, marginal local surf and all points in between.
The board is great. From just looking at the thing and saying “damn!” to getting it under my feet and screaming “damn!” It probably weighs as much as a pu/poly 9’ classic log. With its light weight and natural flowing rocker, the board turns on a dime (it’s not one of the “coming 'round” and watch the clock big boards) and trims along very beautifully. I catch 'em way outside, and sometimes I catch 'em a bit too late for my old nads, but it’s always a hoot and a holler ride. Slide it in sideways or straight in and throw a bottom turn then run back and forth wooooo hoooo.
I’d like to have another one that is .5-1" thicker and maybe an inch wider…just to try the difference. I think we all need just one more board in our quivers…
Here are some pics (sorry no rocker shots):
Hi -
I’d love to see pics. All I get are red x in a box icons. “Properties” show a URL to another site which requires a registration/log in.
Can ya help a brotha out?
Quote:
…rocker, it is only numbers and in the wrong hands is a dangerous weapon.
Lofting it out first lets me see around the bottom curve and get a view of how it will first enter the water, secondly, glide along the water and how the rocker in the tail will work for the turns that I have in mind for this particular board. All the numbers in the world don’t mean a thing if it isn’t proportional.
Amen…
One of the nice things about building framed hollow boards is you have to look at the design of boards differently…
I start with the planshape, next is the stringer and cross ribs…
This is where I feel more like a board designer than a shaper…
I see boards as cross sections, lengthwise and cross wise…
And I can be precise…
I have a hard time understanding how someone can be precise with a foam board stringer when you’ve got all that foam obscuring the stringer…It’s just so much stuff in the way…
Hollows aren’t for everyone, but in the design stage, it’s way more fun…
Over and out…
Paul
Quote:
I NEVER measure rocker, it is only numbers and in the wrong hands is a dangerous weapon.
Lofting it out first lets me see around the bottom curve and get a view of how it will first enter the water, secondly, glide along the water and how the rocker in the tail will work for the turns that I have in mind for this particular board. All the numbers in the world don’t mean a thing if it isn’t proportional.
So do the numbers mean anthing if the rocker is porportional? -Carl
Surfboard building is akin to boatbuilding, and in boatbuilding, although there are a few diehard traditionalists who build boats without measurements, most designers worth their salt these days find measurements to be indispensable.
The guys who do it all by eye without measurements tend to reproduce the same kind of boat or board over and over again, but they are usually out of their depth when moving into new territory. The people who innovate, (or extrapolate !) need to know exactly what they are doing, and that means numbers numbers numbers.
- ===2. -3. ___ …4
567>731,000-8
37648257,*
*#
worth their salt?
a daily part of the regimine
correct me if you choose
was salt.if your hauling on the bowline
and weighing the anchor
or perhaps swabing down
was not of an acceptable
magnitude or intensity
the daily ration of salt could or would be witheld.
the morph to a derogatory comment about
agility with a pencil and math on paper
with refrence to a wire at 377 inches
which is by the way 31+ feet
is a rough comp to the eyeball on foame
or perhaps a bent-to batten
in the hands of a shipwright
who by the way corrects the final
translation from slant table to
reality.Salt I ask you?
the expenditure of effort in the real world
I give the salt to the man in the yard.
My shallowness comes surely
from being raised in the house
of a working man ttrained as a machinist
and utility plumber and a chief machinist mate
in this mans navy.
he spoke endearingly of feather merchants.
an archaic term refering to cargo
in relationship to respectability.
boatswain[bosun] also known as deck apes
machinists corespondingly
oft refered to as snipes
because I imagine
of their apearing from holes in the deck.
now as to new territory
the legend of Mc Tavish’s use of newspaper
got him into historic new territory
without the wire.
the limits are the illusions.
exactly what one may be doing only comes with doing
pencil and paper derives confidence for
those that lack the adventurous souls
necessary to leap to the void.
as to rocker
the pointfrom mr. C.
the old blank ,13’1’’
rocker was reduced from 7’’ or so to 4’’
to make paddle board rocker
and plus 3’’ in the tail
this blank was a Pan Am racing profile
from when the establishment still had sway
in sailboard racing circles and paddle board venues
the plug was shaped by Harold Iggy
and It carried Rick Naish’s name on the blank plan too.
the herschoff dynasty deserves respect
but we who tool also have a deep respect for the finished product and those
who stand responsible for the execution of same.
give my salt to the man doing the job.
and the snuff to the phoofter
on the poop deck with the pencil.
the salt sustained the working man
the cocaine was good powder
for the wig on the bald man.
…ambrose…
nothing better than a set of rocker templates and a crisp sheet of masonite
where is that 31’piece of ire? Clear the decks we be plotting a curve!
Well, If you have numbers-
and you have some sort of CAD,
you can take your numbers and do something rad.
You can start compiling curves,
taken by XY coordinate points,
not just one or two,
and a lot more than just a few-
import that data into your system and see what is kewl!
Start doing curve analysis,
C2 curves, I believe- mentioned here before,
Start using your head and stop following in the paths
left by all the people before you.
While although their footsteps may be seeped in tradition,
That tradition is falling to the past
And new tools are here for a generation of
digital lads.
-Carl 