16' 6" x 28" combination planing hull in the stern, displacement in the bow, widest point aft of center, rocker minimal, not unlike a S.I.C F-18

Farout,has NASA called you yet???lol,
Robboooooooooooo

Getting scared now! Beautiful shape LSD, did you make a template or just go for it? I've got to come down soon so you can try the Penetrator.

It certainly looks fast Dean! Nice job. It will be interesting to see how the flatter section works.
Do you think you can paddle it up to plaining speed?

Allo said...

It certainly looks fast Dean! Nice job. It will be interesting to see how the flatter section works.
Do you think you can paddle it up to plaining speed?

Just guessing but I don't think anyone can paddle a board up onto the plane unless the water is sloping down hill..

DJ

LSD I enjoy your threads and the observations you make about (all!) your new boards.

Keep it up mate

I like it. How much does it way?

LSD said...

Hi DJ,
What would be a good paddle for this board..?
And length?

Kialoa Shaka Pu'u and about 10" overhead......... IMO..

Are you going to scoop out the deck at all?

DJ

I haven't scooped out the deck for 2 reasons on this board. Having a rider weight of 120+ kg there won't be too much free board. Feet would not be above sea level buy much. A scooped deck would be awash, it wouldnt drain well, so no point.
And a scooped deck weakens the board, reduces ridgidity where you need it most.
The weight of the shaped foam is 5kg, add a bit of carbon glass & epoxy it might weigh about 12kg.

Regarding scoop, yes they can provide some comfort or reasureance in the stance.
I have had varying amounts of scoop in boards recently, and found that it didn't make much difference because of the way I would stand quite often.
Certainly on flat water I would stand a stride the board & the feet would be on the edges of the scoop giving a good feel. But in rougher water I would find myself going to my natural surf stance to a degree, for max balance, this is not optimal for racing obviously but it's the most comfortable for me.
Standing with a surf stance, I'm on the bottom of the scoop so its flat, or like a flat deck, my C of G is lowered by the depth of scoop, anywere between 6mm to 60mm, bugger all in comparison to bending the knees & dropping the torso when digging deep in a powerfull stroke with a short paddle, a far greater lowering of C of G.
I haven't found any signifigant gain in stability worth the effort of carving the scoop, particularly with this latest board, it's a hybrid, surfboard & canoe or plaining hull aft that gains stability from it's width & flatness & canoe that shears through water instead of lifting or trying to push over it.
When on a runner the stern of the board will reduce its wetted surface area as it gets on the plane, where a canoe stern won't, I think thats where the speed difference will be realised.
In flat water paddling it has been long proven that k1 & C1 hulls are the most efficent...but we would have a little bit of trouble standing on them
ps...Sorry got a bit off the subject of scoop here, I may use a deck pad with slightly turned up edge in the optimal paddling area, like Naish had on some boards.

Hey lsd, love reading and seeing pictures about your new toys.Just a couple of questions about that new hotrod.When I was a Kid(a few years before White settlement),I got right into white water kayaking/down river racing.The weapon of choice in those days,and it was a long time ago, was Built by Lettmann ,14 feet long ,shaped like an arrow,super tippy ,super fast.The interesting thing though was the flare in the width of the kayak right behind the rider ,this was only there to comply with a minimum width rule.So the shape of the boat looked like an extreme sharp wedge ,leading into a bulbous thicky bit about 2/3 down the length of the boat then the reverse wedge for the last 4 ft of kayak.the design was really striking .It kind of looks like a giant python that's eaten a goat .(my god!! I hope Oliver doesn't read this ,all this talk of pythons etc) .Anyhow,how about incorporating the width of the board at the rear and not in the middle.so it looks like a 10' wedge ending in a 6' long 28" wide surfboard shape at the rear. kind of like a water droplet hanging off a tap. This is just an observation and I've never paddled a downwinder SUP but from the vids it seems like it's a combination of power paddling to catch the swell then step back mal style to glide/surf .Maybe this design could be better suited to a downwinder board design than a thin at the front-thick in the middle-thin at the back design or---------my observations could be full of crap. ps. don't take this the wrong way ,this is not a criticism,just a question about why shapes are used for different styles pps. How about a run down on some of those short boards and how they surf. thanks Rupert

Scotty Mac said...

Hey LSD,
Is that one piece of styrene?

Hi Scotty,
Yes, we have a local supplyer that has a max block size of 2.5 meters, he will hotwire off any thickness. It is easily joined in a particular way so as not to inhibit shaping. Its very economical as the narrow 15" strips left off the 1.2 wide sheet are then glued to make another board.

Have you been playing with short SUB,s?
I notice an 8'6"for sale, how did you find it with the Quad?
My fin setup is toataly different, The fin setup may be a critical part. For me there is no going back to any other board, (I've had 12 SUB's) the 8' 2" board is right on the money, its taken a few waves to find the correct buttons to push & an open mind to ride it, but to sum up it just rips, it is so fast all over the wave, even nose riding. Ive been surfing 40 years & its the most fun yet.
Particularly with the small surf we have had so far this winter, it's the most fun on small Bell's, Rincon....fast little rippers, Although we had a pulse of swell last Thursday & Adam & I tried the "rice bubbles" in some size...a bit over head at Pt Danger, fast down the line stuff.

The shot is Adam 6'5" & weighing 93kg on a 7'10" x 30.75" x 4" proto

I could shape you a board....but dont you do your own?
It would cost more than its worth to get it to SA
Contact me I will tell you how to do it the easy way

LSD said...

The fin setup may be a critical part. For me there is no going back to any other board, (I've had 12 SUB's) the 8' 2" board is right on the money, its taken a few waves to find the correct buttons to push & an open mind to ride it, but to sum up it just rips, it is so fast all over the wave, even nose riding.

Hi Dean,

I'm enjoying reading about your board making experiments. Which board is the one you like the best in the picture of your boards lined up and what is the fin setup that's working for you?



If you get time, can you post a shot from the side - the boards look quite flat, I'd be interested to see the foam distribution and how much rocker the boards have.