Brian Kraut wrote: > The main spar fittings are exactly the same for both the 2 and the > 2S. On the aft spar of the 2 the fittings should all the same, but on > the 2S the spar cants forward a few degrees some of the aft fittings > are a bit longer with a slight difference in spacing from the attach > bolt hole to the holes that go through the spar. They also have a > slight bend to them.
I wasn't brave enough to say it without checking, but they are different. The KR2 had eight straight ones for the center aft spar, and eight for the outer aft spars that had the three degree bend, which gave the spars three degrees of forward sweep. The lengths have to be slightly different for the bolts to line up (through the spar). They are labeled in the KR2 notebook as numbers 2,3 and 4. Not sure why they aren't named 1, 2 and 3. Maybe the mains are "number 1", but the drawing isn't labeled as such. Go figure. The KR2S uses only two different aft fittings, eight of each. They all have the three degree bend, which yields 6 degrees of sweep for the KR2S aft spar, which gives it that more tapered look, and essentially helps to improve the MAC forward slightly, improving stability (slightly). To make this work though, eight fittings are longer than the other eight, so the bolt holes will line up (through the spar). I have them laid out on the bench with a straight edge against them, so I'm not guessing...and this does verify what I was thinking, given that Trailing Edge Technologies made a number of these, and I still have a set (for my next plane)... Mark Langford ML at N56ML.com http://www.n56ml.com
