Take a look at the wings of the Whisper motor glider that I assemble, they are 100% 24DV polystyrene with a single uni-directional glass spar. These wings were tested to 10.6G by the designer in front of the CAA inspectors and thereafter to over 11G to see where it would fail.The test rig collapsed under the weight of all the sandbags before it failed. Although the wing had a few ripples in the skin afterwards, the structural integrity of the wing was still intact. the wing is made from a series of hotwired cores stuck together with micro around the premade spar and then glassed over with a 410g +/- 45deg layer glass and a sacrificial 200g layer at 0/90. No sanding necessary! They are 8 metres long each. Regards Dene Collett KR2SRT builder South africa Whisper assembler See: www.whisperaircraft.com mailto: av...@telkomsa.net ----- Original Message ----- From: "Jaco Swanepoel" <jacosw...@yahoo.com> To: <kr...@mylist.net> Sent: Friday, August 11, 2006 10:06 Subject: KR> Expanded foam
> Hi Guys, > When I started building the wings, The EAA inspector on the project preffered that I use 32DB Polystyrene. It is extremely hard. I had it pre-cut by the supplier and glued into place. I used a belt sander with 100grid paper to profile it. That was a huge job. The 32DB does not make those little balls like normal Polystyrene. It makes dust when sanded. I could not press a hole in it with my finger. There are some photos on my website under the wings menu. > http://www.mykitlog.com/users/index.php?user=jacoswnpl&project=70 > > Regards, > Jaco Swanepoel > Pretoria > South Africa > KR2S, ZU-DVP > > > --------------------------------- > Stay in the know. Pulse on the new Yahoo.com. Check it out. > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html >
