Sunday, 14 November 2010
Postcuring daggerboard and rudder
The heat source. 5 x 60W light bulbs plus dimmer switch. I have found this to be very controllable.
Heat source under the board. The bottom edge of the board did get a bit hotter than the top, but on the whole the heat rising up from below was quite well distributed., about 5C difference between top and bottom.
Rather crude cardboard oven. But it did the trick OK ( with a bit of additional room heating to cover the heat loss from the cardboard) . It is suprising how long a large piece like this takes to heat up. (and cool down!) You begin to think that you are not giving it enough heat, but in reality most of it it is being absorbed by the board for the first few hours or so. After that you can begin to actual get the temp up a bit. As the board has a wooden core, I did not want to get it too hot. In the end it had about 24hours at about 45C. (Cure for the resin I am using is 50C for 16 hours.) Hopefully this will be about equivalent.
Oven No:2 for the rudder/sleeve/gudgeons/composite chainplates/bowpole/forestay backet fitting. A smaller volume to heat up, should be a bit quicker hopefully.