ULF-1 Discussion Archive
Anonymous static archive of the former Mailman list
Anonymous static archive of the former Mailman list
Re: [ULF-1] Build Considerations
Hi Jim, We did some adhesion tests with T-88 epoxy, and it worked quite well. Because the foam is porous there is a fair amount of absorption (like the end grain of balsa), so we put the glue on generously on both surfaces. We glued the ribs onto the spar stiffeners. Since the spar stiffeners were not the same thickness as the foam ribs, we added 2 strips of balsa on either side of the spruce stiffeners to make the attachment point the same width. We are planning to use triangular shaped balsa stock to do this with the wing ribs to save weight. Member 67 Sent from my iPad > On Sep 29, 2014, at 6:57 PM, Member 101 <[email]> wrote: > > Hi Member 67, > How did you attach the ribs to the spar? Styro is not renowned for its adhesion to glues. > Member 101 > > From: Member 72 <[email]> > To: "[email]" <[email]> > Sent: Saturday, 27 September 2014, 23:40 > Subject: Re: [ULF-1] Build Considerations > > Hi Peter, > Doris > We have used 1/2" Blue Dow Home Insulation foam ribs throughout (except 3/4" thick ribs at wing roots) capped with 3/32" spruce cap strips top and bottom. We did loaded destruction tests on these ribs and compared them to the stick built ribs. Weights were comparable, but they were 3-4 times stronger than stick built ribs, plus much faster to build. So, we feel this is a more modern way to build all the ribs, but nearly as beautiful as Josef's ribs! > > We digitized all the loft drawing contours, and cut out all the ribs with a computer controlled CNC cutting machine with a round router cutting blade. We programmed the machine to cut 3/32" less top and bottom to allow for the thickness of the spruce cap strips. > > I will try to send some photos. > > Member 72 > SN 383 E > > > > Sent from my iPad > > > >> On Sep 27, 2014, at 12:56 AM, Member 100 <[email]> wrote: >> > >> Hello. I am new to the discussion group and I am considering a ULF-1 project. I have read many of the threads here and they inspire a few questions. What are most of the builders cutting out your parts with? CNC? Those that used the blue foam for the ribs, did it work and substantially cut down on build time? >> >> Best Regards, >> Peter Member 100 >> >> >> >> >> >> >> >> >> _______________________________________________ >> ULF-1 discussion list -- [email] >> >> Subscribe, Unsubscribe, Preferences, List information: >> http://lists.ulf-1.com/listinfo.cgi/ulf-1-ulf-1.com > > _______________________________________________ > ULF-1 discussion list -- [email] > > Subscribe, Unsubscribe, Preferences, List information: > http://lists.ulf-1.com/listinfo.cgi/ulf-1-ulf-1.com > > > _______________________________________________ > ULF-1 discussion list -- [email] > > Subscribe, Unsubscribe, Preferences, List information: > http://lists.ulf-1.com/listinfo.cgi/ulf-1-ulf-1.com