Dear Lemat, Why the sarcasm?
For an end product, where shattering is my main concern, nylon is superior to fiberglass.
It doesn’t matter what your text books says about flexural modulus, nylon surfboards dings less.
For many other end uses, other reinforcement is better. An engineer looks at all efficiencies, from utility, to appearance, to workability, to cost.
Of all the practitioners on Swaylocks, EVERYSURFER is the one I’d like to glass a surfboard for me. Period. If we were geographically closer to each other, it would already have been done. The man knows his $#!T, IMO.
Some really great information here, thanks guys, really appreciate it.
By your earlier comments comparing nylon laminates to epoxy, and saying there is no difference ignores the physical/ mechanical properties between woven fabric and a solid layer.
That’s sort of like saying there is no difference between solid rod, tube, woven cable, and chain. Just saying that they are all steel, so all equal.
A pretty big oversight.
Mechanical specs are contraintes they are indépendant of shape. Shape is take care by quadratic moment (=cross section for tensil/comp). When you calculate a part you first find external forces then you calculate contrainte using shape then you compare this contrainte to max admissible contrainte of material.
Learn about mechanics.
Dear Lemat,
If you don’t understand the different bending/ recovery aspects between woven and non woven materials, it is really hard to explain to you.
To help you see the difference, take a length of 10 guage wire in both stranded and solid. Do they have the same stiffness? Now bend them back and forth to fatigue. Which one breaks first. Now take some 4 oz fiberglass cloth and a light bulb. Drop them on the floor. Which one breaks.
Could do a you tube video lesson.
I’d really like to see. I could be wrong on everything, I’m always open to learn.
Durability test with polyester grid cloth for outer skin. I use this to keep rail cracks from happening.
impressive lakewaves.
how do you get that stuff to wrap the rail cleanly? I struggle.
What else is in that lam?
Lakewakes That looks prity cool what exactly is this polyester cloth? We’re do you source it from? Many thanks
ok let’s go speacking about steel wire know.
Because i can’t use gerc letter i will use C for constraint (in Mpa= N/mm² si unit), F (N) for force, E young modulus (Gpa) and l % for elongation.
So i take a soild wire with S his section i stretch it with a force F and i look what happen in material : C=F/S, and l=C/E.
Now i take a stranded wire with a sum section of each wire equivalent to S, same force F, i have C=F/S, and l=C/E.
So if it’s same steel both wire have exactly same strengh and deformation to tensil forces.
So way use stranded wire ?
In stranded wire each wire can slip between each other, bending strengh of thin wire is far less than thicker one(because quadratic moment is far less), so stranded wire of same equivalent section have a bigger winding radius than solid wire. When you calculate a mechanism with wire you need to never crooked wire up to his elastic winding radius . So with stranded wire you can reduce size of mechanism.
If there is a weakness in material a solid wire can break all whereas in stranded only some wire could break, that can make a good difference.
For glass, and all fragile material, it’s exactly same thing that happen, each filament of fiberglass are only plain glass and they have properties of plain glass but they can slip each other… It’s interseting to see with a microscope how you destroy them when you swat a piece of fiberglass !
No one is wrong about everything as no one is right. Mechanic is my passion, may be because i always succed with, not the same in all LOL, so i make really long studdy in mechanic then it became my work, i was (well) paid to calculate all kind of parts and know i teach it.
All cloths are wetted out on table.
Grid cloth is not vac bagged and at B stage rail is zipper cut at hard tuck.
This cloth adds weight to the board as I fill bottom texture smooth and leave deckside somewhat textured.
I use high strength glass with 70 TPI and is not optically clear, so I can pigment the grid cloth to cover up the rail wrap off color…
Same stuff as Coil use. And drapes very easy.
Some fine work indeed. Would have a good application in the rails of SUPs to protect against paddle dings.
