Hey Lemat what about Warp Glass to improve break strenght?
Quantum hydrodynamics (QHD) is most generally the study of hydrodynamic systems which demonstrate behavior implicit in quantum subsystems (usually quantum tunneling). They arise in semiclassical mechanics in the study of semiconductor devices, in which case being derived from theWigner-Boltzmann equation. In quantum chemistry they arise as solutions to chemical kinetic systems, in which case they are derived from the Schrödinger equation by way of Madelung equations.
An important system of study in quantum hydrodynamics is that of superfluidity. Some other topics of interest in quantum hydrodynamics are quantum turbulence, quantized vortices, second and third sound, and quantum solvents. The quantum hydrodynamic equation is an equation in Bohmian mechanics, which, it turns out, has a mathematical relationship to classical fluid dynamics (see Madelung equations). This is a rich theoretical field.
Some common experimental applications of these studies are in liquid helium (He-3 and He-4), and of the interior of neutron stars and the quark-gluon plasma. Many famous scientists have worked in quantum hydrodynamics, including Richard Feynman, Lev Landau, and Pyotr L. Kapitsa.
I'm not sure what the equivalent weights of M and H grade EPS are, but I lived in Central Florida for years where eps/epoxy boards have been pretty common for the past 20 years.
A pretty bullet-proof build for stringerless 2lb EPS is 4/4/4 deck, 4/4/ bottom. You could add carbon to tweak the flex where you want, but it's not really necessary and could do more harm than good if put in the wrong areas. Carbon is VERY stiff and brittle.You want a layer of glass over it to avoid sanding into it.
I've had a 6/6 deck 6 bottom 2lb stringer EPS board that lasted me over 5 years and I sold it and it was still in good shape. With stringerless you want more glass to account for the lack of stringer support. It actually works out better though because then you're putting the strength where you need it, in the skins.
lawless wrote: I've had a 6/6 deck 6 bottom 2lb stringer EPS board that lasted me over 5 years and I sold it and it was still in good shape. With stringerless you want more glass to account for the lack of stringer support. It actually works out better though because then you're putting the strength where you need it, in the skins.
To make up for the lack of stringers, adding extra glass or carbon should be on the rails, especially on the back third of the board. If you don't, you will notice the board boggs when bottom turning. Look at a Coil. Notice where they have their special grid fabric. Mostly in the tail, and then less as they go up the board, and only on the rails.
Extra reinforcement on the bottom, does a fraction of what that same reinforcement would do on the rail. "Springers" are easy to do in a factory, and are equal parts marketing and effect. Carbon on the rail is much harder to do in a production setting, so is less of a profit maker, but actually changes the way the board would ride.
lemat wrote: Warp glass is a logical fiber patern for surfboards. Used with some +-45 degrees under foot. Deadshaper give best advice in posts about stringerless lb...
Seems to be the commonsense answer. I can't think of a better return for the money; now ponder that one, yawl.
Maybe he should try ES latest, Cordura.
Swaylocks Surfboard Design Forum: thoughts & theories ... practical & theoretical
RAIL PROFILE http://bgboard.blogspot.com/2014/03/march-82014-afterr-seeing-recent.html