Enclosed some shots of board. Foils are build in CNC cut alloy moulds.
Rudder is Naca12 profile. Board is Naca9.
Layup is in
mould: white Epoxy gelcoat, fine layer of glass, several layers (up to
8) 300gr Unidirectional carbon and 300gr woven carbon laminat done with
vacuum and cured under 50 degree for 1 day then core from red cedar
strips in the middle and foam on the sides glued in with light weight
epoxy glue under vacuum and also cured overnight at approx 50 degree in
the box then both halves plained down flat, edges cleaned and cut etc
and then bonded together with 1 layer of glass in the middle (to make
sure there is glass in the middle at the edges of the foil so trailing
edge is very stiff) inside the 2 mould halfs each at 120 kg and clamped
together and post cured again while bonding overnight again at 50 degree
in box.
We cannot get it hotter than 50 but that is o.k.
Foils all come out at under 6 kg and are damned stiff.
We have now made about 12 or 13 and some have gone to DEN, FRA, SWE, SUI
and now 1 set to Paul Young at Rondar.
Only problem is that it takes too much time but we cannot make it faster
and I don't know where to save time and it is stupid with these
quantities to give it to Poland for production also moulds have been
very expensive.
Holger Jess
www.segelsportjess.de
