With a busy work schedule leading up to Christmas and christmas itself, there has been very little movement on the new centreboard.
Well I got back into it today with the pull-trusion being glued onto one side of the vertical.
With this foil I am making a conscious effort to take things slow and steady, with a view to maximise strength per gram in the construction. When planning this foil, I thought that I would only be able to get a single length of pull-trusion in the foil and laying flat with a ton of glue to match the square shape into the angle of the foil.
Needless to say I am very happy that I managed to get two full lengths, on edge, essentially forming a box section right through the entire length of the foil, which will give a significant improvement on my current, “soft centre” main foil. (Before anyone mentions it, the screw through the mould and the pull-trusion that looks like it was not straight were adjusted after this photo was taken. Also if you are wondering you are looking at the end of the mould which used to be attached to the square horizontals.)
This new construction method is working out as a much better way for part timers like myself. It removes the need to perform a single, huge one day effort, and makes it a series of nice, simple 1-2 hour jobs, and if you were making multiple foils, you could build several in parallel.




December 27th, 2008 at 9:11 pm
Bruce:
What is the laminate schedule for the skins? I suspect mostly some uni-directional but also some cloth laid +-45 degrees. Curious home builders want to know…
Joe
December 28th, 2008 at 2:59 am
All I want is a heavier stiffer foil…
December 28th, 2008 at 5:12 pm
Joe,
The skins are 8 layers each, 2 of 200gsm square weave, and 6 of 200gsm uni’s giving 1,800 GSM per side total. Will this be enough ? I’m not really sure. The last foil had 12 layers per side and uo to 24 at the hull to prevent breakage there but I think that was overkill.
I will be adding another 2 short pull-trusion lengths where the foil exits the boat just to make sure.
December 28th, 2008 at 5:15 pm
Bora,
Fire up your CNC machine and make one, and bolt your existing bottom foil on it.
AFAIK, the bladder moulded Bladerider foils are just the skins and are hollow in the middle, so the addition of some CST pull-trusion would possibly be another option.
December 29th, 2008 at 12:06 am
That is in the “works”