This is my first all Paulownia board, I have a zillion paulownia slats (from a blind factory) at 1/8th of an inch thick so the deck and bottom will be 2 and 3 layer multi directional laminations of slats.
Here’s the outline of the board (a 9’7") and fin setup. . . a ten inch diameter tunnel with two 4"x4" keel fins:
Turbo J I am in New Zealand so not sure if a Paulownia supplier over here is going to be much use to you, I got the stock from a neighbour who was moving to Perth and had a load of it from a blind factory which went out of business. . . mostly 3mm slats but also some bigger stuff and a huge stack of 6"x2" blocks about 2 feet long. I have a link to a Paulownia supplier in the USA somewhere in my old computer, can dig it out if you like.
How’s the weight of the paulownia compared to your standard redwood or monterey pine? It would be really interesting if you ended up with roughly the same weight as a standard heavy glassed 10’ foam longboard, just in terms of ride comparison. Hmm. With that template, any bottom contours or are you going with your standard parallel profile?
The Paulownia is lighter than Redwood and a bit heavier than balsa, but much stronger.
Maybe a smidgin of concave, yep parallel profile (That’s not STANDARD parallel profile BTW, it’s revolutionary, amazing, modern, functional, the best of all possible profiles, a quantum leap ahead in profiling, etc etc)
Weight wise, we will have to see, but I’m going lighter on this one for sure, maybe a ridiculously light 25 pounds.
Best I go and do some work on it. . all talk and no work makes Tom a Blow***e !
Yes it’s a bit of a contrast to your snail avatar. … . don’t worry, those spasms start at around 33mph, they clear up at 35mph, just wind it up a bit faster.
When i first started making kiteboards years ago i use to lay up 3 to four layers of paulownia (kiri) blind slats much the same way. The boards tended to come out heaver than just a solid pice of timber and more flexy as well. But they where as strong as. I now just use a solid piece (12mm thinned down to 6mm tips) and heat bend/over bend to get the minimal rocker for kiteboards.
The 1/8 (3mm) strips would be great as a skin over a EPS blank (compsand). I like the shape of the squid what benefits of the 1/4 moon tips do you think you will get?
his email is mthope@erols.com does carry 3 - 4" stock but very expensive & long time to dry in kiln Does customer order, suggested 4/4 then glue up 4/4 premium 100bf $4/bf 4/4 #1 100bf $3/bf 4/4 #2 100bf $2/bf link where I found it: http://www.paulowniatrees.org/links.htm Nice guy - didn’t blow me off when I asked him all sorts of (probably dumb) questions
disclaimer - I haven’t actually bought from him… hope the info helps.[/]
I’ve been looking into paulownia weights/densities, and did some tests myself - here’s the results:
Balsa seems most commonly to weigh around 150 kg/m3 (9 - 10 pound per cubic foot), but can range from around 100 kg/m3 (6 pound) to 200 kg/m3 (13 pound).
The paulownia I have weighs in at 240 kg/m3 (15 pound per cubic foot).
Waaaay stronger than balsa, ('scuse the pun) and I fully believe the claims that it soaks up less resin, resulting in a lighter overall weight, you can use thinner pieces for same strength as well.
I’ve fully jumped on the paulownia band-wagon, the stuff is great.
Really straight grain, and I can get balsa any longer than 48 inch pieces, whereas paulownia I can get 10 foot+.
Just my own “bend a stick” test, but it feels more twangy (technical term) than balsa, so maybe that translates into a lively board? hope so.