Search found 64 matches

by PhillyViking
Tue Oct 27, 2020 1:18 pm
Forum: Paipo Board Design & Building
Topic: Quad Concave Body Board Study
Replies: 71
Views: 1605

Re: Quad Concave Body Board Study

Yes, Per Lord, W/L = .5 is great for clean and .4 ratio is more optimal for rough. See figure 7 at https://mypaipoboards.org/pubs/LordLindsay/PlaningHulls/1_p011-16-aspect_ratio.pdf. Clean flats would definitely benefit from more width but for rough flats, wider becomes counter productive at a point...
by PhillyViking
Tue Oct 27, 2020 10:53 am
Forum: Paipo Board Design & Building
Topic: Quad Concave Body Board Study
Replies: 71
Views: 1605

Re: Quad Concave Body Board Study

Usher, what is about the Hubb that leads you to say its design is faster at the expense of 'turning' than others,e.g. MND? The aspect ratio and dims are close except for the WP being further forward. Following is my attempt to pull togeather some things we have been talking about. I hope I am not ju...
by PhillyViking
Sat Oct 24, 2020 12:17 pm
Forum: Paipo Board Design & Building
Topic: Quad Concave Body Board Study
Replies: 71
Views: 1605

Re: Quad Concave Body Board Study

Wow, my eyes tricked me. I looked at actual specs of MND compared to Hubb board. There is actually more difference between wp to nose and wp-tail of hub than MND. The defining difference is in the NTWP (Nose to wide point). Hubb is further forward than MND. I suppose that makes it look less rounded ...
by PhillyViking
Sat Oct 24, 2020 10:51 am
Forum: Paipo Board Design & Building
Topic: Quad Concave Body Board Study
Replies: 71
Views: 1605

Re: Quad Concave Body Board Study

also at at glance .. seems the hubb has slightly more parallel rails then some others. I have not compared the actual specs but there appears less delta between the wide-point and the tail and the wide-point and the nose width. I like that approach. It seems some of the others are too rounded. It se...
by PhillyViking
Sat Oct 24, 2020 10:36 am
Forum: Paipo Board Design & Building
Topic: Quad Concave Body Board Study
Replies: 71
Views: 1605

Re: Quad Concave Body Board Study

more on Hubb board .. they keep concaves to 18 inches of tail. Some of the others take them more toward center point. That would relate to the idea of pivoting weight forward and back on BB. On a right sized hubb you could lean back to get weight on the channels for turning hard and lean forward to ...
by PhillyViking
Sat Oct 24, 2020 10:25 am
Forum: Paipo Board Design & Building
Topic: Quad Concave Body Board Study
Replies: 71
Views: 1605

Re: Quad Concave Body Board Study

I see what you mean about my friend's board having a Hubberd profile - see https://hubboards.com/products/hubb-edition-quad-core-sci-five-hubb-tail?_pos=3&_sid=e3729e277&_ss=r I see that board actually has 5 narrower concaves than the MND's quad. That board has the distinct tail design and the widep...
by PhillyViking
Fri Oct 23, 2020 9:32 am
Forum: Paipo Board Design & Building
Topic: Quad Concave Body Board Study
Replies: 71
Views: 1605

Re: Quad Concave Body Board Study

Many paths lead to the same destination. I got on to this BB examination because I watched a friend work the ready fore/aft weighting on his BB.. its has the basic scale and profile of a foamy BB but is fiberglassed so is stiffer and consequently faster. I see exactly what Krusher74 described. You c...
by PhillyViking
Thu Oct 22, 2020 10:40 am
Forum: Paipo Board Design & Building
Topic: Quad Concave Body Board Study
Replies: 71
Views: 1605

Re: Quad Concave Body Board Study

I was using "blunt" to refer to the lack of a point on the BB nose outline profile. I agree that nose width and thickness are separate attributes to be considered as well. Perhaps it would be more appropriate to say a BB has a squared off nose profile that may or may not have a blunt thickness? I pu...
by PhillyViking
Wed Oct 21, 2020 11:05 am
Forum: Paipo Board Design & Building
Topic: Quad Concave Body Board Study
Replies: 71
Views: 1605

Re: Quad Concave Body Board Study

My favorite board for summer surf this year has my worst craftsmanship. The blank itself was a repurposed use of a previous unusable failure and was not brought back to a perfect blank starting point. I was shooting for the wegener tuna design but because mine was so thin (1") I got in trouble. I ex...
by PhillyViking
Tue Oct 20, 2020 8:47 am
Forum: Paipo Board Design & Building
Topic: Quad Concave Body Board Study
Replies: 71
Views: 1605

Re: Quad Concave Body Board Study

thanks for the pics and comments. VERY helpful. I will have some comments later. Please do send the .brd file. I will have to come to terms with installing AKU via Linux on my Chromebook but that will get me going since I wanted to move to CNC anyway. I find building boards gratifying but I am a ter...
by PhillyViking
Fri Oct 16, 2020 7:57 am
Forum: Paipo Board Design & Building
Topic: Quad Concave Body Board Study
Replies: 71
Views: 1605

Re: Quad Concave Body Board Study

While on the comparison roll, A mat has multiple concaves as a result of its tubes. Apparently that contributes to its ability to turn as well as it does. Perhaps I am just trying to make a more rigid mat that will turn harder and take a leash. That would suggest short with a blunt nose. "More rigid...
by PhillyViking
Fri Oct 16, 2020 7:16 am
Forum: Paipo Board Design & Building
Topic: Quad Concave Body Board Study
Replies: 71
Views: 1605

Re: Quad Concave Body Board Study

It just occurred to me that in addition to mats having even more blunt noses than a BB that they are also short (compared to a 48" + paipo) like a BB, The mat's squishyiness is a great feature when you do a big air drop to a flat landing. I put 1/4" of cork on my paipo boards but its not the same.
by PhillyViking
Thu Oct 15, 2020 8:44 am
Forum: Paipo Board Design & Building
Topic: Quad Concave Body Board Study
Replies: 71
Views: 1605

Re: Quad Concave Body Board Study

thanks for the thoughtful comments. krusher74, I need to build a "safer" design along the more known lines of yours, Wegener, my narrower previous iteration of the same (but more volume), etc. and another that might be 1 of 20 experimenting with quad concaves. Making two boards is not a problem but ...
by PhillyViking
Sun Oct 11, 2020 11:00 am
Forum: Paipo Board Design & Building
Topic: Quad Concave Body Board Study
Replies: 71
Views: 1605

Re: Quad Concave Body Board Study

Usher, You are fortunate to be at peace with your stable design. Maybe I will get there on my path. I do see the benefit of keeping the board short enough to trim and turn simply by leaning fore and aft from one position. However, I can't help thinking the blunt nose of a standard BB pushes water he...
by PhillyViking
Sat Oct 10, 2020 11:05 am
Forum: Paipo Board Design & Building
Topic: Xylem Paipos are back
Replies: 8
Views: 113

Re: Xylem Paipos are back

I can see that the SRFORB could work in east coast summer beach break in particular. Check out some of the pics on the site. I recently built a bigger board than usual for slop but added too much buoyancy (EPS foam). All my extra float got in my way. The 60”x 28” x1-1/4” SRFORB has more surface area...
by PhillyViking
Wed Oct 07, 2020 7:41 am
Forum: Paipo Board Design & Building
Topic: Xylem Paipos are back
Replies: 8
Views: 113

Re: Xylem Paipos are back

Josh makes a Paulownia version if that was not clear. His made me think of the foam version in the vid which is just a foam blank without a skin.
by PhillyViking
Wed Oct 07, 2020 7:37 am
Forum: Paipo Board Design & Building
Topic: New board
Replies: 4
Views: 76

Re: New board

doing your own thing is so so cool! Its great to witness as well. I was trying to process this and had this thought.. My Bonzer has fins set at 18 degrees in part to better engage to the angle of the wave when not going straight. In a sense you just take this one step further, I have this image of y...
by PhillyViking
Mon Oct 05, 2020 9:22 am
Forum: Paipo Board Design & Building
Topic: Quad Concave Body Board Study
Replies: 71
Views: 1605

Re: Quad Concave Body Board Study

I am glad you (krusher74) jumped on to this thread.  I rode a  paipo board this summer and fall that I built using the rail and bottom design derived from my Wegener Tuna.  I was influenced by your posts.  I agree that is a great approach .. it turned well and I stuck some steep faces.  At 48 x 19 X...
by PhillyViking
Mon Oct 05, 2020 8:37 am
Forum: Paipo Board Design & Building
Topic: Xylem Paipos are back
Replies: 8
Views: 113

Xylem Paipos are back

I just noticed that Josh Klein is building customized classic and derivative Paulownia paipos again. https://xylemsurfcraft.com/ I have two of his boards. He is an old school craftsman and good soul. I have ridden his boards in east coast slop and demanding Costa Rica heavy breaks. He has a new boar...
by PhillyViking
Wed Aug 12, 2020 8:11 am
Forum: Paipo Board Design & Building
Topic: paipo paulownia with rib?
Replies: 13
Views: 3469

Re: paipo paulownia with rib?

I was able to vacuum 3mm paulownia with cork in a sandwich and retain the target flex and rocker. However, it got too heavy due to infusing too much epoxy to the cork so was unusable. There are solutions to that problem. By the time I got around to a 2nd shot, the 3mm paulownia source disappeared, M...