Glynnis Young wrote: > Other Mark - you have the makings of a really nice guy - why are you coming across as such a hard nosed prick? Really no need.
Because if I don't do it, nobody else will, and if it doesn't get done, a lot of folks will blurt out one-liners, not delete volumes of text from their replies, and all the other stuff that some people do to annoy the rest of the subscribers and waste their time. And then there are the others (like you) who feel shortchanged by KRnet, and feel compelled to complain to 450 people about it. I'm sure there's a reason why I haven't been able to find all of those helpful posts you made to the list in the past. > We are experimenters and pioneers. I would really NOT like to see any classic "ambulance chaser" claims as to why the guys who have the answers do not give them. I'm sorry, but I was rather busy yesterday. Left the house at 6AM and got home at 10:30 last night. Working on a design solution to prevent young folks from being shot and/or blown apart by roadside bombs while touring the desert, as I recall. Sorry I didn't drop what I was doing to answer the spar question, but I will do my best to do it now, since I'd hate to keep you waiting any longer. Steve J wrote: <<The spar pillar spacing for the centre section (Main Spar) varies - typically: FWD Spar Dwg 5 (from the centre out) - 7.5"; 7"; 5"; 10"' 10" = total 39.5" half-span. I assume this spacing was relevant to the mountings of the original retract gear. The same dwg also shows another view of the fwd main spar with a pillar spacing of 13.5" centres?? Question 1: What have the builders done that opted for the later fixed u/c?<< I've never been able to figure out the odd spacing, and neither was a structural engineer here at work. But I figure if several hundred of these have been built, and never experienced a spar failure, I'm not going to worry about it either. <<The overall spar length (Center Fwd) is given as 83" with (*65) in parenthesis? Could this be the KR1 wing dimensions? Similarly, the Outer fwd spar length 77.5" (*59.5"). The outer fwd spar the pillar spacing is given as 6" TYP.>> I don't have this version of the plans, so I don't know. >>It has intrigued me for many years that the pillars are not all the same thickness (shear web to shear web). Is there an engineering reason for this or is weight reduction the reason? Maybe spar breathing?>> The same structural engineer had no clue about this either. >>Question 2 is: The KR plans call for no taper on the centre section and a double taper for the outer spar caps. That makes sense with a short carry through spar but in my case the centre section spar is much longer. I am making the spar caps nearly 30% deeper (66mm vs. 50mm) and would like to shed some weight by uniformly (proportionately) reducing the thickness all the way out. With a laminated spar it will be extremely convenient if it is OK to keep the same cap width and reduce the cap depth all the way out (through the joiners at half span). i.e. - a single taper in front view (no taper in plan view). Is there and engineering reason /principle that makes this a bad idea?<< Common sense would (and did) tell you that to build it like the plans would result in a stress riser at the WAF location, so you've got to do something different if building it continuous. I'm not sure what they were thinking when they came up with that wing attach fitting design. I believe Stu told me that Ken had a stress guy he worked with design that spar, and I'm not sure what that guy was thinking either. The bottom line is that unlike some people, if I don't know the answers to questions, I won't answer them! As you can see from my replies above, I don't know ANY of the answers to ANY of these questions, so besides the fact that I didn't have time, I decided to leave them for somebody that does. Somebody asked something about the AS5046 and the GA(W)-1 a while back, but specified that they didn't want opinions, they just wanted facts. I didn't answer that one either. It seems I just can't do enough for some of you people, and I offer you my deepest heartfelt apologies for letting you down... Mark Langford, official KRnet prick (for the moment) N56ML at hiwaay.net see KR2S project N56ML at http://home.hiwaay.net/~langford
