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Bottom turns
Posted: Tue Apr 09, 2013 5:03 pm
by bgreen
Rather than hijack Krushers board design thread, here are a couple more bottom turn photos - the bottom photo doesn't have much board in the water at all

- Bells_closeup2.jpg (8.77 KiB) Viewed 3068 times

- Bells_closeup (420 x 600).jpg (33.27 KiB) Viewed 3068 times
Re: Bottom turns
Posted: Tue Apr 09, 2013 6:18 pm
by krusher74
On my own board I stole the back corner design for the alaia, it seems the role from the concave to the V being not a sharp edge grips the water and give you fin like traction with out the drag of a fin.
Its talked about by tom wegner in this video on the design of his seaglass tuna model
http://www.youtube.com/watch?v=Wq_Y3GOWM40
Re: Bottom turns
Posted: Tue Apr 09, 2013 7:42 pm
by Uncle Grumpy
krusher74 wrote:On my own board I stole the back corner design for the alaia, it seems the role from the concave to the V being not a sharp edge grips the water and give you fin like traction with out the drag of a fin.
Its talked about by tom wegner in this video on the design of his seaglass tuna model
http://www.youtube.com/watch?v=Wq_Y3GOWM40
That's essentially the bottom I have on all my finless stuff to date and they all work.
Re: comments on the other thread
Aside from the influence of leg and body drag(ing) a surf "board" ( & mat) follow the rules of hydrodynamics regardless of surf style.
The inside back corner is the "Sticking Point" both literally and figuratively.
The rest is personal choice or fashion following (or both).

Re: Bottom turns
Posted: Wed Apr 10, 2013 2:49 am
by krusher74
I really find my foam and fiberglass paipo to be superior in the hold and control department, and after thinking about this I wonder if they have basic bodyboard design all wrong?
If i ever get another bodyboard I will try a custom and get an alaia tail.
Re: Bottom turns
Posted: Wed Apr 10, 2013 11:11 am
by Uncle Grumpy
I designed this custom bodyboard with lines and concave similar to my alaia and had it made up by Kenu Hawaii (Ken Brown)
I like it better than a typical bodyboard but it still has too much flotation for my taste which is my complaint with most BB's.
I wish it was half as thick. IMNSFHO fat BB style rails are slower than a thin alaia type rail.
Re: Bottom turns
Posted: Wed Apr 10, 2013 3:44 pm
by bgreen
Uncle G,
How thick is this board with too much floation?
Bob
Re: Bottom turns
Posted: Wed Apr 10, 2013 6:59 pm
by krusher74
Uncle Grumpy wrote:I designed this custom bodyboard with lines and concave similar to my alaia and had it made up by Kenu Hawaii (Ken Brown)
I like it better than a typical bodyboard but it still has too much flotation for my taste which is my complaint with most BB's.
I wish it was half as thick. IMNSFHO fat BB style rails are slower than a thin alaia type rail.
DSCF1691.jpg
Toobz bodyboards in central cal will shave a bodyboard core down to any thickness you like. I'm 165/170 lbs and i ride a 41"/41.5" bodyboard, a 42" and above feels like a boat, if that board you have in the pic is like 50" can see why it would be far to boyant!
You can also get the PP core which is stiffer and 1,2 or 3 stringer rods if you like a real stiff board, that would get a bodyboard closer to a wood/fiberglass paipo.