Mr. Savant, do you have a KR in Omaha? If so I would love to come down and see it. I live 30 miles west of Norfolk, Ne. You can e-mail me direct at br1...@gpcom.net so we don't clutter up the list.
Thanks, Bryan ----- Original Message ----- From: "Ameet Savant" <ameetsav...@yahoo.com> To: "KRnet" <kr...@mylist.net> Sent: Tuesday, April 25, 2006 6:15 PM Subject: Re: KR> Removing Foam after glassing? > Robin, > > What you are essentially saying is that you want a > wing with nothing but spars and skin. No foam no ribs. > Just a fiberglass skin will be quite flimsy as pointed > out by Mark. It will probably take a lot of plys to > build up the skin to a thickness that might support > its shape, but at that point the weight gain will > counter the initial effort. You see that done on > carboard R/c planes. But those things generally very > little power loading and are low aspect ratio wings. > > Even if you are able to figure out a way to make the > skin light you still need something that takes the > shear loads. That is what the foam and the ribs do for > you. It IS structural. The skin glass fibers on the > bias help transfer the shear forces to the foam or > ribs, but will not support the complete load in the > absence of the the foam or ribs. The wing will > collapse because of drag and twist. > > I think Mark Langford's KR is made with ribs (2 ribs?) > and a sandwich skin. The sandwich skin is certainly a > good idea as it is lighter and strong then a coreless > glass layup. I don't know if that method has any > weight advantage over the method described in the > plans. > > My recommendation is not to proceed with your intended > modification. > > Regards, > Ameet Savant > Omaha, NE > --- Robin Wills <krvia...@bigpond.com.au> wrote: >> My understanding is the foam is completely >> non-structural, and by >> removing it, I could possibly save up to 20Lbs. >> Proposed method is to glue the foam in place, per >> plans, but apply duct >> tape over the foam between the spars and around the >> leading edge, glass >> the wing, then pop the foam loose, leaving the >> nicely shaped fibreglass >> behind. >> >> Comments anyone? >> >> Cheers, >> Rob. >> >> Robin Wills >> Second Person, Pacific National >> KR-2 19-4594, Ser# N111 >> >> krvia...@bigpond.com > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > > _______________________________________ > 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 >
