Sounds like more weight, and more work, for very little benefit. CF layups would be plenty strong. I built my elevator with CF, and it can chop wood.
Ron Smith KR2SSXL Buckeye Arizona mercedesm...@yahoo.com http://ronsmith.myphotoalbum.com/albums.php --- On Fri, 10/17/08, Martek Mississippi <rep...@martekmississippi.com> wrote: From: Martek Mississippi <rep...@martekmississippi.com> Subject: KR> Wing Skin Reinfrocement To: "KRnet" <kr...@mylist.net> List-Post: krnet@list.krnet.org Date: Friday, October 17, 2008, 12:08 PM I have noticed on the KR2 I just purchased that the wings are not as stout as I would like. When I moved the wings to the storage area I could hear the foam under the fiberglass cracking with moderate handling, which I don't care for at all. Mark L's decision to layer the wings using a fiberglass-foam-carbon fiber sandwich is the common sense solution, but in order to insure that my new wings will handle the rigors of being taken on and off regularly , I am considering an additional step. In this step, prior to laying up the outer layer of CF, I will put a crosshatch of 3/4" wide Vee grooves in the outer layer of foam, and then fill those grooves with a layer of CF, which would form a grid of reinforcing angles UNDER the outer skin when that is applied. It seems like a reasonable extra bit of work to do for some extra peace of mind. I'm also going to add four 1/4 inch threaded inserts into the top of the spars (2 front , 2 rear).That allows me to put Eyebolts into the wings during ground operations and lift them using a boom, thus being able to load, unload and attach the wings by myself without putting stress on the skins. How do those idea sound to my fellow netters, particularly you Mark L? Glenn Martin N1333A, Biloxi, MS
