Ken, I don't know if you have thought about it or not before you order the spar material but if you intend to use either of the AS series airfoils that were developed a number of years ago I think that you would require taller spar materials. I had to laminate onto top and bottom of the main spars. Not much but it would have been eaiser to have the spars the right height to begain with. As for the comment about the hoeky foam spar extention-- I know exactly who coined that phrase but I have seen nothing to disprove that there is one single thing wrong with it.The only difference I did myself was to use carbonfiber for the layers on the extention. But it should be lighter by ounces on each wing and was not a problem to build. Also some guys may shorten the wings by the leght of the foam extention. I think that decision should be only considered once you have decided what is going to be your favorite flying altitude. I now use O2 and will be at 13k to 15 k whenever I can. The longer wing is certainly an advantage up there. All in my opinion, your milage may vary but I know what mine is. Joe Horton
---------- Forwarded Message ---------- From: "Ken Henderson" <kenhender...@q.com> To: <kr...@mylist.net> Subject: KR> Spar vs. Capstrip spruce stock List-Post: krnet@list.krnet.org Date: Tue, 30 Mar 2010 13:26:44 -0600 All, Still trying to get my Aircraft Spruce wood order right and I have a few questions. Is capstrip suitable for use as spar and longeron material? In their online catalog Aircraft Spruce states that their capstrip stock is "non-structural". Aren't spars considered structural? The reason for this question is this. For the KR-2S front and rear outer wing spars I will need (4) 1 15/16" x 1 7/8" x 90" and (4) 7/8" x 7/8" x 91" pieces of spruce. These pieces are longer than what is supplied in the kit because I am eliminating the hokey foam spar extensions. I can order 7/8" x 7/8" capstrip material or I can order a piece of spar stock 7/8" x 4" x 91" and rip my 4 rear outer spars from it if the capstrip material is not suitable but I can't figure out a way to do the front outer spars. Spar stock is available in up to 1 1/2" thickness and capstrip is available in up to 1" thickness. Either path will require a lamination of 2 pieces to achieve the required thickness unless I can order special thickness spar stock. Any advice? Thanks, Ken _______________________________________ 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 ____________________________________________________________ Best Penny Stock Picks We Analyze The Best Stocks. Open An Account Online Today! http://thirdpartyoffers.juno.com/TGL3141/4bb35603dd8ae33769st03duc
