long time ago, but here is a new update about the blades.
We decided to make the core of the blades from P.U. foam.
for the one who don't know how Polyurethane works, check my youtube video where I did a test. >>>>
http://www.youtube.com/watch?v=09DlB6UhItw We want to make the polyurethane foam core into the blade mold, that we have exact the right profile.
But then there will be one problem, the core will be to thick. Because the Polyurethane core is exact the size of the mold, there will be no space for the glass fibre.
That's why we decided to laminate in the 2 mold pieces the exact glass fibre package, as you can see in the picture.
So when we put in the polyurethane foam with the two laminated scales in it. The core will be smaller then the mold, and there will be place for the glass fibre package.
After that we designed a construction for in the beginning of the blade. You can see the 3D sketch of it in the picture below. The wooden disc is the place were the bearing of the hub will be on.
When that's done, the mold can be prepared for the polyurethane core.
I don't have have pictures of putting the foam into the mold. When the 2 components are mixed together there is only 20 seconds left to bring it into the mold and close it.
Like in this picture
After two ours, the mold can be opened, and this is the result.
In the next picture, you can see the work of the two laminated scales in the mold.
this week we will try to make our first blade.
I keep you posted.
Marijn
