Thanks Joe, thanks for the insite. I was looking at building a KR but the list is encouraging me to buy an unfinished project instead of building. This mode has made me looking at the plane from a different point of view. Now I need to be an inspector first, then a builder. I want to be able to know what I'm looking at is acceptable and what is not. This helps. I know I saw some fuel lines but I also know I saw a control stick mounted forward of the main spar with a control tube passing through the main spar. It looked centered but now I can't find the picture again. Anyway, thanks for your input. Phill
On , "joe.kr2s.buil...@juno.com" <joe.kr2s.buil...@juno.com> wrote: > phill,I am not an engineer but have some real life experience with this > idea. (construction & structural steel) Typically a small hole in the > centerline of the web is not an issue. The futher the hole needs to be up > or down from center determines if it would need reinforcement. Also the > distance from the end of the span is a factor. I think that I have a > picture somewere out there of what you describe. I have a 3/8" fuel line > run through the main spar on centerline and very near the point that the > spar is supported at the fuselage side. I also have (2) 1/4" extension > tubes for fuel shut off's through the spar so that the fuel shut off's > are right between my legs on the front side of the spar. But i stopped > there with holes and ran wiring around or over the spar I am sure there > is math that can be done to show the maximum size that could be put > through and the reinforcing would most likely be an additional layer on > each face fully bonded. The holes must be neat and without tearout or > splintering of the web material. Edges need to be sealed. Personally I > concider a 3/8" hole in the center line to be minor. A hole for something > the size of a torque tube i think is major. The box spars as shown for a > KR2S (fully enclosed) are incredably strong.Hope this helps,Joe Horton > . ---------- Forwarded Message ---------- > From: phill.h...@gmail.com > To: KR List kr...@mylist.net> > Subject: KR> Drilling through the spar > Date: Thu, 09 Feb 2012 14:43:17 +0000 > Recently I ran across a picture of a KR that had what looked like a 3/8" > metal tube, like a fuel line, or similar, running through the main spar > just inside the cabin, then farther inboard, a hole with a control rod > running through it. This was the main spar, not the aft spar. It didn't > look like the shear web was reinforced in anyway. I was just wondering if > that's a good idea or not. If the area was reinforced, I could go along > with it but it looked like they just drilled through. I went back trying > to > find this picture so I could provide you all with a link but I couldn't > find it again, now I feel stupid. But in theory, you shouldn't pass > anything through the spars unless it's properly reinforced, right? If > someone did go through the spar, what would the reinforcement look like, a > doubling of the sheer web, application of some CF or BID to the area, > what? > I wish I could find that picture again. > Phill > _______________________________________ > Search the KRnet Archives at http://mylist.net/private/krnet/ > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html > ____________________________________________________________ > 60-Year-Old Mom Looks 27 > Mom Reveals Free Wrinkle Trick That Has Angered Doctors! > http://thirdpartyoffers.juno.com/TGL3141/4f33ec79324f7f9ab0cst04duc > _______________________________________ > Search the KRnet Archives at http://mylist.net/private/krnet/ > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html
