paipo paulownia with rib?

[asier esnal]

In a few weeks I want to make another paipo, I am very happy with the paulownia of 18. But I can not guarantee the rocker I want, when I do it I have to count on the return of the wood and it is totally uncontrolled I never know how it will be

I have been studying a few boat constructions these days and it has occurred to me to put a central frame to hold the rocker. the idea is to force the paipo with some sargentas to take that form, to glue with a gorilla-like glue, pvc glue and then polish with polyester.

the idea is weird I put some photos. as you see?

es

dentro de unas semanas me quiero hacer otro paipo, estoy muy contento con la paulownia de 18. pero no puedo garantizar el rocker que quiero, cuando lo enfibro tengo que contar con el retorno de la madera y es totalmente incontrolado nunca se como va a quedar

he estado estudiando estos días un poco de construcciones de barco y se me ha ocurrido poner una cuaderna central para sujetar el rocker. la idea es obligar con unas sargentas al paipo a coger esa forma, pegar con cola tipo gorila, cola pvc y luego enfibrar con poliéster.

la idea es rara os pongo unas fotos. como lo veis?

[asier esnal]

this is the same idea with 2 reinforcements

[asier esnal]

A friend has given me an article about a surfboard that he made a long time ago. He reminded me of this idea adding eva rubber. Like the ideas of the Frankenboogie model, there is no need to laminate with epoxy
http://www.valenciaplato.com/2015/09/al ... agHaRtYMA8

[asier esnal]

There are ideas that need a rest to mature and rethink. Now I think it's time to mix many things that I've done so far

Paulownia runs across the width of the board, so I can easily book it. fiberglass down so it does not crack and stringer up to give the rocker

to give more floating plates that are used in swimming pools like those in the photos, they are closed cell and do not adsorb water.

I still do not know how to glue these plates to pawlawinia, I do not know if they are compatible with polyester, I know they are 40 density, so they are very well weight, it is not necessary to laminate them with fiberglass,

Quick work to make prototypes and very rare forms

It's my version of the Frankenboogie

what do you think?

[bgreen]

Tom Wegener vacuum bags a foam core to paulownia, as do others who make composite boards.


How thick is the paulownia and what method are you using to get the nose rocker?

[asier esnal]

The thinnest paulownia I can buy is 15mm, in a warehouse near home. with that thickness I can not make the paulownia eps paulownia sandwich system, the weight shoots up, I have to brush the wood until I get 6mm thick and that would be throwing more than half of the wood in the garbage, a pity and spending money

in this post they have a previous experiment that I explain and we discuss the way to cut the wood. This way of working has been very good, the only downside is that the bending process is totally imprecise. an adequate rocker is not guaranteed, it can go out much more or be very flat without having any control of the process, of there is to put a stringer to guarantee the form.

http://mypaipoboards.org/forum3/viewtopic.php?f=4&t=854
es

la paulownia más fina que puedo comprar es de 15mm, en un almacén cerca de casa. con ese espesor no puedo hacer el sistema sándwich de paulownia eps paulownia, el peso se dispara, tengo que cepillar la madera hasta conseguir 6mm de espesor y eso sería tirar más de la mitad de la madera a la basura, una pena y gasto de dinero

en este post tienen un experimento anterior que explico y debatimos la forma de cortar la madera. ha resultado muy bien esta forma de trabajarla, la única pega es que el proceso de curvado es totalmente impreciso. no se garantiza un rocker adecuado, puede salir mucho más o quedar muy plano sin tener ningún control del proceso, de hay poner un stringer para garantizar la forma.

http://mypaipoboards.org/forum3/viewtopic.php?f=4&t=854

[asier esnal]

the result would be something like that. It is very ugly, very very ugly

[asier esnal]

I have got a piece. It is compatible with polyester.

I have sanded half of the cork to remove the plastic that covers it. I have laminated a piece with 6 and another with 6 more 6

Results: the part that has not been sanded is delaminated as nothing is clear that it does not grip. the part that I have sanded with 80 grit and the polisher very easy to grind. It has held incredibly well much better than any foam fiber. polyester with fiber, when pulling the fiber and has even come to tear bits of blue cork

Problems can not be used as a core to make surfboards or bodyboards to be so flexible even with two fabrics of 6 + 6 ounces flexes the core and fiber part
But it has given me a very good feeling to use as the top of a board. A wood that is curved or whatever it is that is curved to give the rocker is glued with polyester. the cork has its flexion, that is, it will take the shape well, it will be able to give very good results.

It can be a very good way to make boards for summer softboard. boards for winter that we do not want to hurt us ... top of paipos

Very happy with the experiment now I have to study who is going to be hit. I need a very rigid bottom. They could be paulownia boards to make the Alaia floating. Two birch woods with a preformed rocker .... I am left with a laprimera. I maintain the option of paulownia with stringer

I also see this appropriate core to make a sandwich without having to laminate the rails, it does not adsorb water, when deforming it is elastic and returns to its original position and will protect us from shock

es

He conseguido un trozo.Es compatible con el poliéster.

He lijado la mitad del corcho para quitar el plástico que lo recubre . He laminado un trozo con 6 y otro con 6 más 6

Resultados:la parte que no lo he lijado sea deslaminado como nada está claro que no agarra. la parte que he lijado con lija de 80 y la pulidora muy fácil de desbastar. ha agarrado increíblemente bien mucho mejor que cualquier fibra al foam. poliéster con fibra, al tirar de la fibra e incluso ha llegado arrancar trocitos de corcho azul

Problemas no se puede usar como núcleo para hacer tablas de surf o bodyboard al ser tan flexible incluso con dos telas de 6 onzas flexa el núcleo y la fibra se parte
Pero sí que me ha dado una muy muy buena de sensación para usarlo como la parte de arriba de una tabla. se pega con poliéster mismo una madera que esté curvada o un lo que sea que esté que esté curvado para dar el rocker. el corcho tiene su flexión o sea que cogerá bien la forma podrá dar unos muy buenos resultados.

puede ser una muy buena forma de hacer tablas para verano softboard. tablas para invierno que no queremos que nos hagan daño...

Muy contento con el experimento ahora tengo que estudiar a aquel va a ser le pego. necesito un bottom muy rígido. podrían ser planchas de paulonia como para hacer a la yaya flotantes. dos tablas de abedul con un rocker preformado.... me decanto por la primera. mantengo la opción de paulownia con stringer

también veo este núcleo apropiado para hacer sándwich sin necesidad de laminar los rails, no adsorbe agua , al deformar es elástico y vuelve a su posición original y nos protegerá de los golpes

[bgreen]

Rather than an external rib, why not just insert two stringers? It involves cutting your board and gluing in two stringers.

[asier esnal]

It is an idea that I thought about a while ago. I do not opt for this for 2 reasons:
strength of the board: when doing with the rib the wood will have much more force since I do not have to divide into pieces the blank

I'm not looking for a nice job in sight, I think of efficiency. but the one that matters most to me is the speed to make a prototype, working with polyester uv, I could do all the paipo easily in one morning and in the afternoon to be in the water catching waves, this is very important for me and it is the challenge of this manufacturing system, be able to have boards quickly as cheap as possible, minimum work, with rocker, fins, flotation, and a good performance

I have estimated the cost in less than 50e per paipo and 4 or 5 hours of work, counting that he will have fiberglass work, polished ,,,

es

es una idea que la he pensado hace un tiempo. no me decanto por esto por 2 motivos :
fuerza del tablero: al hacer con la costilla la tabla tendrá mucha mas fuerza ya que no tengo que dividir en trozos el blank

no estoy buscando un trabajo agradable a la vista, pienso en eficacia. pero la que mas me importa es la velocidad para hacer un prototipo, trabajando con poliéster uv, podría hacer todo el paipo fácilmente en una mañana y a la tarde estar en el agua cogiendo olas, esto es muy importante para mi y es el reto de este sistema de fabricación, poder tener tablas de manera rapida lo mas baratas posibles, mínimo trabajo, con rocker, fins, flotación, y un buen funcionamiento

tengo estimado el coste en menos de 50e por paipo y 4 o 5 horas de trabajo, contando que tendrá trabajo de fiberglass, pulido,,,

[asier esnal]

I have already started with the prototype, good impression, good flex, but when rolling through the tension of the fiberglass the rocker of the rib has been reduced. for the next prototype I will have to paste 2 stringers. the table has a very good flex

the design is an exaggerated copy of the nomastomas table but reduced to my size 44x19. I wanted to try this outline, nomastomas, I hope it does not bother you.

Now I'm going to buy the blue and white sponge to float, next week I hope I can paste everything

the board goes to air with 4 fins, but these will be put at the end of the process

es

ya he empezado con el prototipo, buena impresión, buen flex, pero al laminar por la tensión de la fibra de vidrio se ha reducido el rocker de la costilla. para el siguiente prototipo tendré que pegar 2 stringers . la tabla tiene un muy buen flex

el diseño es una copia exagerada de las tabla nomastomas pero reducido a mi tamaño 44x19. tenia ganas de probar este outline, nomastomas , espero que no te moleste.

ahora voy a comprar la esponja de color azul y blanca para darle flotación, la semana que viene espero poder pegar todo

el board va a air con 4 fins, pero estas las pondre al final del proceso

[Poobah]

I'm not suggesting this method, but I thought you might enjoy a really old school way of holding a bend in a timber board. Kerf cuts were made across the nose, and then the bend was held in place with two boards on the rails. They also function as handles.

bf0816.jpg (102.62 KiB) Viewed 13152 times

bfkerf.jpg (59.48 KiB) Viewed 13152 times

This old photo of actress Dorothy Sebastian seems to show a similar board.

[Poobah]

I suppose it's also worth mentioning that John Galera made a paipo with fiberglass and balsa core...end grain balsa core. It comes in sheets, and is mostly used in boats. As I recall, John glassed his boards on a tarp or something that would curve when he added weights to the board (before the resin hardened.) Mostly he worked with sheet foam, but he made at least one balsa core paipo.

His interview is at: https://mypaipoboards.org/interviews/Jo ... 0922.shtml

[PhillyViking]

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, My thought now is to substitute Okoume or even Maple Veneer for the 3mm paulownia.. both are readily available.

Okoume is the wood of choice for ply boat builders. Its heavier that Paulownia but is well suited otherwise, Maple is used for skateboards etc, See https://www.roarockit.com/ for inspiration.

You can minimize weight by sandwiching alternate layers of foam with the veneers or ply rather than making one thick piece of wood. I am not sure that gets you down to the weight of paulownia but that's the thought.