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Messages - sflinux

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1
The Shape Shack / Re: Ultralight Board Designs
« on: January 30, 2023, 10:32:34 PM »
I wonder how Mark Raaphorst's catamaran design (standamaran) would work as a foil sup. 
With a catamaran you have stability and speed. 
The platform gives you a direct connection to the foil. 
Design:
https://www.youtube.com/watch?v=d39NOFm_hMM
Test:
https://www.youtube.com/watch?v=e1TyAiIewhQ
UFO foil catamaran:
https://www.youtube.com/watch?v=59UyJESbhJA
cat dimensions:
https://www.multihull.de/technik/catdimension.pdf
Peter Lynn designed one for a kite alternative to a buggy:
https://www.youtube.com/watch?v=N7gRKIBO4rA

2
Foil SUP / Re: Weight Matters
« on: January 30, 2023, 08:58:47 PM »
And how about the the relationship of center of mass relative to the pivot point of the swing weight?
Erik Antonson commented that he likes to slide his mast forward in the box to minimize swing weight for pumping.
He commented that the heavy weight of a SUP wasn't a negative thing when the mast was moved forward in the box, but was when it was further back in the box. 
The KD Maui foil mast placement of holding the foil at 1/3 back [center of pressure] from the leading edge from the front foil and have the board be level (upside down).  Erik is moving his mast more forward relative to this setup to make pumping easier.
https://soundcloud.com/progressionproject/foil-series-ep-7-kane-dewild 23'
https://www.youtube.com/watch?v=SVgOg8r6zbg

3
Foil SUP / Re: Foil Math Wave Size = 2X + 1 and Big Waves
« on: January 30, 2023, 08:01:51 PM »
Sick!
I like the equation.
Jet skis are noisy and stinky (gas fumes).  An all electric jet ski always seemed like the obvious answer, and finally became a reality in 2022.

Beasho are any of your buddies using the T3MP3ST Maverick GT?

https://www.t3mp3st.com/
Specifications:
RunTime: Up to 4 Hours
Charge Time: 60 Minutes to 80%
Capacity: 0-4 Humans
Motor: 550 HP
Battery: 100 KWH+-
Charger: Level 3
Dimensions: 13.6’ L X 4.4’ W X 5’ H, 18” DRAFT
Weight: 1,300 LBS

4
The Shape Shack / Re: Ultralight Board Designs
« on: January 29, 2023, 08:19:26 PM »
Beasho, the board is looking killer.
The carbon rods looks bomber.
Do you think high density pour foam would be lighter than carbon rods?
https://www.youtube.com/watch?v=X496qvFC2bU

5
Foil SUP / Re: Weight Matters
« on: January 26, 2023, 06:15:25 AM »
This XPS has a density of 1.6 pounds/ cubic foot:
https://xps.supply/product/kingspan-greenguard-4-x-4-x-8-square-edge-board-insulation-21/

That converts to the above units of 25.6 g/L
{(1.6 pound = 725.7478 g, cubic foot = 28.31685 L) => 725 g/28.3 L}
So a final board density of ~32 g/L is impressive.

With 0.1% water absorption, an unfinished 100L board could take on 0.1 L = 100 grams
Assuming the volume stays the same, but the weight increases, that would give a "wet" density for XPS of 26.6 g / L.
{28.3165 L x 0.001 = 0.0283165 L of water = 28.31685 g of water; (725.7478 + 28.31685) / 28.31685 L }

Is this where you guys are sourcing your XPS?

6
Foil SUP / Re: Weight Matters
« on: January 26, 2023, 05:21:34 AM »
With all the talk about board lengths, and widths why doesn’t anyone talk
WEIGHT ?
What does it WEIGH?
Or more specifically, don't we want to know the density of a SUP foil board?
Density = Mass (g) / Volume (L)
Reference) 1 pound = 453.5924 grams ; 28.34952 g = 1 oz
e.x. #1)
i.e. Your foil amigo's board is 9 lbs right now: 7' 6" Board x 21" @ 125 Liters 
Density (foil amigo's board) = 4082.3 g / 125 L = 32.7 g/L

e.x. #2) Flying Dutchman 100L board @ 160 oz
Density (Fying Dutchman) = 4535.924 g / 100 L = 45.4 g/L

e.x. #3) Kalama Performance E3 7'2" x 31.75" 167L @ 18.96 lbs
Density (E3) = 8600.1 g / 167 L = 51.5 g/L

e.x. #4) Sunova Sup foil 7'3" x 33" 167L @ 8.96 kg
Density (sunova) = 8960 g / 167 L = 53.7 g/L

Like board dimensions, I agree weight should also be included the specifications of a foilboard.  I hope other manufacturers do like Kalama Performance & Sunova and include that spec.  Jimmy Lewis does not.

7
Classifieds / Re: 2015 Starboard WidePoint 8'10" Carbon SUP - SOLD
« on: January 26, 2023, 04:06:04 AM »
Board has found a new owner (sold)

8
The Shape Shack / Re: Ultralight Board Designs
« on: January 18, 2023, 10:04:17 PM »
The mast placement relative to the KD Maui tail looks close, so close that it doesn't look like you would hit the tail while pumping.  In a Progression Project interview with Kane, I seem to remember him saying that he likes simple structures in his boards as they are more predictable in a variety of conditions.
The GoFoil picture with the cutaway tail, the mast looks further up on the board, so much that it looks like the tail would hit the water when pumping.
How far do you put your mast from your tail?

Going back to the sub 10# goal of this project, is that to mainly minimize swing weight?  If so, couldn't you use a lighter density foam outside the the standing area, as that part of the board is just there for volume, when on the water.  I envision a board within a board, with the low density foam being unreinforced and replaceable with gorilla glue when damaged.

9
Random / Re: Some days technology just fucks with you
« on: January 17, 2023, 10:56:36 PM »
lol on your daughter's comments.
It feels like 2023 is the year of fixing stuff.

10
Classifieds / 2015 Starboard WidePoint 8'10" Carbon SUP
« on: January 16, 2023, 05:45:21 PM »
If anyone is looking for a Starboard Widepoint 8'10" SUP, I have one for sale.
The Carbon construction is bomber at 18#.
Dimensions 8'10" x 32" x 4.2" 140L
Has connections for tail block handle installed.
Board is located in SF Bay Area.

11
The Shape Shack / Re: Ultralight Board Designs
« on: January 15, 2023, 12:42:08 AM »
The Dowel method looks killer, thanks for sharing.

PVC is heavy (density = 1.4 g/cc).  I would use Paulonia wood instead (density = 0.26 g/cc and does not absorb water. [for reference xps has a density of 0.04 g/cc]

Ryan Burch rode a finless unglassed chunk of foam with a specific aspect ratio, which he called the Lord Board.

The board was fast, but fragile.  Glassing the deck should keep it from snapping.  I wonder if flexseal could be used on the rails.  I repaired a catchsurf softboard with gorilla glue foam, then sprayed several layers of flexseal to give a pretty decent waterproof seal.
https://www.youtube.com/watch?v=K63S4KFk9Tw
I wonder how much cardboard surfboards weigh:
https://www.youtube.com/watch?v=BrIidL34rfw

13
Luke covers the complete build of a DIY wood core hydrofoil wing set with a DIY aluminum fuselage in a youtube series.
Here is a video of Luke testing his first v1 hydrofoil:
https://www.youtube.com/watch?v=i8tPuwqofbA
Her is a video of v2 test by Ryan Parsons:
https://www.youtube.com/watch?v=7JC_kyitZ-0

Luke provided free plans of his v3 here:
https://flukeskitesurfing.com/hydrofoil-plans-v3

How to build:
#How to Build a Hydrofoil: Overview, Planning and Design (Video 1/15)
https://www.youtube.com/watch?v=af-iiFLuzis&t
#How to build a Hydrofoil: Machine and Cutting Wing Outline's (Video 2/15)
https://www.youtube.com/watch?v=8dROMWkN2EY
How to Build a Hydrofoil: Carving The Wing's Foil Shape (Video 3/15)
https://www.youtube.com/watch?v=U66Eb_JkOm0
How to Build a Hydrofoil: Wing Resin Sealer Coat (Video 4/15)
https://www.youtube.com/watch?v=vq20i-rNY5Y
How to build a hydrofoil: Fibreglassing the Bottom Of Wings (Video 5/15)
https://www.youtube.com/watch?v=VH9RGvnfMQw
How to build a Hydrofoil: Screw Holes and Trailing Edge Filling (Video 6/15)
https://www.youtube.com/watch?v=PDDtd_P2qf0
How to Build a Hydrofoil: Top Of Wing's Fibreglass Lamination (Video 7/15)
https://www.youtube.com/watch?v=RkUsDGfb_3Q
How to Build a Hydrofoil: Wings Resin "Hot" Filler Coat 8/15
https://www.youtube.com/watch?v=FFMHmE_5cBk
How to Build a Hydrofoil: Foil Wing Final Sand & Connection Holes (Video 9/15)
https://www.youtube.com/watch?v=wyV3vRXwUh4
How to Build a Hydrofoil: Fuselage - Design and drilling holes (Video10/15)
https://www.youtube.com/watch?v=gGpQxhoigQk
How to Build a Hydrofoil: Fuselage - Shaping The Aluminum (Video 11/15)
https://www.youtube.com/watch?v=Cp5Yd1IqnLw
How to Build a Hydrofoil: Fuselage - Tapping Threads (Video 12/15)
https://www.youtube.com/watch?v=wL0eI0qggh0
Coming Soon:
13. How to Build a Hydrofoil: Fuselage - Routing (Part 13)
14. How to Build a Hydrofoil: Assembly and Final Points. (Part 14)
15. How to Build a Hydrofoil: Riding it for the First Time. (Part 15)

These plans are most appropriate for kitesurfing.  But the build process is applicable to any size wing. 

14
General Discussion / Re: 10' to 7'9" SUP?
« on: January 06, 2023, 08:50:06 PM »
The way I think of shortening a board relative to another is you lose equal distance at nose and tail, relative to your paddle stance.  Going from 120" to 94", you are losing 26", so your nose will be shorter by 13" and your tail will be shorter by 13".
Measure your 10' board and put a mark of tape 13" from the nose, and another mark 13" from the tail.  Paddle out and have a look.  Imagine that first 13" of nose not being able to touch the water.  To do that you will have to put more weight on the tail.  I find that moving to smaller boards, keeping weight on the heels helped with balance, preventing the nose from catching.  A staggered paddle stance is ideal for balance.
With a smaller board, the paddle cadence changes.  You no longer want to do long power strokes, instead shorter strokes with a higher cadence is better for balance.  Practice paddling never letting your paddle go past the your heels.
With a 10' board you are most likely used to moving your feet around.  With a sub 8' board, any changes in your feet position are small, less than half a step.
Losing 3" at nose and tail is a very smooth transition [i.e 8'6" Simsup or 9'6" traditional].  Losing 6" at nose and tail may take some practice to get used to.  [i.e 8' Simsup or 9' traditional]

15
General Discussion / Re: 10' to 7'9" SUP?
« on: January 06, 2023, 05:37:35 PM »
https://www.blueplanetsurf.com/blogs/news/sup-board-volume-recommendation-chart/
An advanced surfer typically wants a guild factor of 1.3 or larger.  With your weight of 160# = 72.7 kg.  You probably want a board 94.5 L to 131 L. That assumes semi-clean conditions.  Going from a 10' board to a sub 8' board, you will notice the lack of stability from nose to tail (pitch).  If you shrink a board in length, going wider relative in width helps with the side to side stability (roll).  Using large fins will help with twisting (yaw).  Let's say your 10' board was the infinity New Deal 10' x 27" 122L.  Going from 122L to 94L should be no problem with practice in clean conditions.  Ideally you would probably want to drop down 6" in length at a time if money was no object.  The Simmons (i.e SimSUP) shapes (7'10") feels similar in glide and stability to a traditional board that is 1 ft longer (8'10").

Just an example of <8' boards that Jimmy Lewis carries::
JL Supertech 7'10" x 27.5" 94L
JL Destroyer 7'7" x 29 100L
JL SF Narrow 7'6" x 29.5" 100L
JL Worldwide 7'9" x 29" 103L
JL SF Wide 7'6" x 31" 115L

I would think the Supertech would be the most challenging of the bunch.  At 7'10", you probably want a board that is at least 29" wide, 31" would be more stable in non smooth conditions.

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