SDF no4 (US blanks green Pu 5.10RP)

What works and what doesn't. Share design ideas, references and contacts for paipo board builders.
CHRISPI
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Re: SDF no4 (US blanks green Pu 5.10RP)

#11

Unread post by CHRISPI »

How important is the weight of the board in the big picture, when I am riding on a wave my board weighs 110 Kg when I bottom turn it adds a few more, if my board weighs 5 Kgs thats 4.8 % of the running weight a few Kgs more or less cant make much difference to prone riders ?
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Re: SDF no4 (US blanks green Pu 5.10RP)

#12

Unread post by nomastomas »

Board weight is an interesting topic. I don't think it affects the board's performance per se. A heavy rider has more impact on board performance than a heavy board. But, board weight does impact the rider. I've found that heavier boards provide different "input" to the rider than "lighter" boards.
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Re: SDF no4 (US blanks green Pu 5.10RP)

#13

Unread post by krusher74 »

More progress on the board. :D

Single 6oz on the bottom, and 4oz + 6oz top with 4oz extra tail patch for my knee duckdiving, blue tinted resin.

The name "bigfoot" was inspired by a mix of the wideness of the template, the old grow redwood stinger and a solo surf I once had after a hour hike north of shelter cove where I sat in the water looking at the forest feeling like bigfoot was going to appear any minute. :?
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nomastomas
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Re: SDF no4 (US blanks green Pu 5.10RP)

#14

Unread post by nomastomas »

Nice work! Are you going to pinline the lap?
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krusher74
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Re: SDF no4 (US blanks green Pu 5.10RP)

#15

Unread post by krusher74 »

nomastomas wrote:Nice work! Are you going to pinline the lap?
I don't think so! :?
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bgreen
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Re: SDF no4 (US blanks green Pu 5.10RP)

#16

Unread post by bgreen »

I ride boards that range from around 4.5 to 10 lbs. On a specific board, where one board weighs just a little more than the other, the difference may be less significant.

However, I think weight can make a difference especially when conditions get choppy or windy. Momentum style boards, that don't have initial speed rely more on weight as well.

Bob
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Re: SDF no4 (US blanks green Pu 5.10RP)

#17

Unread post by krusher74 »

Its Done! :D

FCS now do coloured leash plugs and fin mounts!

Flat here this weekend , not even a ripple, net day off is wednesday for a maiden voyage! Waves from hurricane Joaquin coming :o

Now to decide on a cork deck patch or not :?
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Re: SDF no4 (US blanks green Pu 5.10RP)

#18

Unread post by jbw4600 »

That's a crazy looking board. I am sure it will fly.
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Re: SDF no4 (US blanks green Pu 5.10RP)

#19

Unread post by krusher74 »

Ride report:

Took it out in a local weak reef break 2/4ft, catches waves well, holds a rail fine without the "chine" made a couple of barrels, so far seems very loose, and not had chance to put it though some hard bottom turns, more surf on the weekend, should be able to try some differing conditions.

Happy so far! :D
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Re: SDF no4 (US blanks green Pu 5.10RP)

#20

Unread post by krusher74 »

We had a good run of swell so I got to try the new board out a lot.

surfed 5 times now in knee high to over head conductions, the boards catches waves well in all size waves, whether steep or sloppy on the take off.

The main difference I am finding is the surfboard rail lacks grip and drive, it almost feels likes its not there, where my chined rail boards have a very definite feel of connection to the wave face, with a very positive knifing/locked in feel on a hard bottom turn, with this board it feels somwhat unconnected, almost like when your foot is numb from cut ff blood, its works but you cant feel it.

I feel there may be a little to much sharp edge and release from the hull to the rail in the last 12", there should be enough resin there to blunt the edge over, so I will try that to see if I get more bite. :?

I think it would be great with a small twin fin set up, but I like doing 360's to much give up finless for now. :lol:
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Re: SDF no4 (US blanks green Pu 5.10RP)

#21

Unread post by nomastomas »

How much rocker in your present design? With the right combination of bottom curve and fin size (small), its pretty easy to release the fins (TBG4: NR=2.75, TR=0 .75). I've done inadvertent 180s when kicking out while riding in a forward position. I suspect with a little practice a 360 is possible.
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krusher74
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Re: SDF no4 (US blanks green Pu 5.10RP)

#22

Unread post by krusher74 »

nomastomas wrote:How much rocker in your present design? With the right combination of bottom curve and fin size (small), its pretty easy to release the fins (TBG4: NR=2.75, TR=0 .75). I've done inadvertent 180s when kicking out while riding in a forward position. I suspect with a little practice a 360 is possible.
Its about 3" nose 1/2" tail (more in centre with open concave)

I had tiny knubsters fins on my endeavour board as an experiment. Only about an inch deep. Surfed on them for a few months and could still 360. Then took them out one day and the board felt much faster without them (with them was like driving a car with the parking break left on a little) and 360's now spun much faster.

I don't think the benefit of fins will ever outweigh their drawbacks for me personally. :cry:

I will take this as the experiment it was and go back to my chine rail next time, it has more bite and drive. I guess it acts like a long fin? At least I now know how they both act. Hopefully I can somewhat sand off any release edge there is in the last 12" of the rail to see how much more traction that gives.

Are you still going to make your finless board Thomas?
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Re: SDF no4 (US blanks green Pu 5.10RP)

#23

Unread post by Pes78 »

Hey krusher when shaped the board did you feel the foam getting softer? I just ordered another blank in green density and lowered the tail rocker a 1/2".

Paul
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Re: SDF no4 (US blanks green Pu 5.10RP)

#24

Unread post by nomastomas »

Keith...that project always gets moved to the back-burner. I like what Ekstrom has done with bottom and rail contours. But with El Nino just around the corner, I'm currently focused on building a p-board ("prone board" is what Buzzy Kneubuhl calls sandwich construction paipos. I like it!) that performs well in OH waves. I plan to increase the length to 50" or 52", adjusting outline and foil to maximize flat out speed. Both thickness and wide-point will be slightly forward of center. Key will be designing a board that has sufficient volume to really plane well but can still duck dive easily. Bottom will be deep single concave a la Maurice Cole's work. Just have to work out hand placement. I like the forward "bumps" of Gus Acosta's Wave Arrow, but I'm also considering a modification of the "pickle-fork" nose seen on the Gemini shapes. I think that would help to keep the elbows on the deck, away from the rail. Fins of course, either full-sized 5.25" twinnies with 1/8" toe-in and 7-deg cant, or quad with M7/AM2 fronts and a pair of AM2 center fins for rears, set using McKee's formula. I've got a couple of months to work out the details...
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Re: SDF no4 (US blanks green Pu 5.10RP)

#25

Unread post by jbw4600 »

Keith, If you decide to put fins on it, you might try putting some Grom sized thruster side fins. They have low surface area and are pointy. Pointy fins pivot better than the those keel like fins.
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Re: SDF no4 (US blanks green Pu 5.10RP)

#26

Unread post by nomastomas »

BTW, where did you place the fins? How much toe-in? Cant?
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Re: SDF no4 (US blanks green Pu 5.10RP)

#27

Unread post by bgreen »

Patrick,

The new board sounds interesting. When will it be on view?

Bob
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Re: SDF no4 (US blanks green Pu 5.10RP)

#28

Unread post by nomastomas »

Bob...its still in my head, but soon I should have some drawings to share
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Re: SDF no4 (US blanks green Pu 5.10RP)

#29

Unread post by krusher74 »

Pes78 wrote:Hey krusher when shaped the board did you feel the foam getting softer? I just ordered another blank in green density and lowered the tail rocker a 1/2".

Paul
The Green foam seemed to stay firm as I got deeper, but i dont have much foam/shaping experience :? , definitely firmer that a previous blue blank
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krusher74
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Re: SDF no4 (US blanks green Pu 5.10RP)

#30

Unread post by krusher74 »

nomastomas wrote:BTW, where did you place the fins? How much toe-in? Cant?
dont know the numbers but here is a pic, rear most position was the only place i vaguely liked
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