Saw the website, the analysis is lacking. It has Neil Bingham's "A Critical Analysis of the KR-2." ( http://web.cuug.ab.ca/~cartera/krspecs.html ) Most of the five page article is a rant on keeping the gross weight of the plane down to 800 pounds. The calculated stresses section consists of a statement that at 900 pounds gross Neil did not find anything that would fail under +/- 7Gs followed by a discussion of the capacity of the landing gear and the modification he made to it. He provides equations and numbers for the landing gear analysis.
As for the existence of a structural analysis, Bill Marcy did one for the KR-2 spruce structure. Jeanette has the copyright. She doesn't want to make modifications easy because she is selling the parts and plans for the "as designed" plane; therefore, she doesn't provide the analysis as part of the plans set. Given Mark's current seatbelt concerns, has anyone considered where the longerons are going to fail when you fly into the obstacle that creates a 20G load on the seatbelt. Is adding extra width to the cockpit going to change where they fail? Would it be desirable to add some diagonal bracing between the longerons to control where the failure occurs so you don't end up with an engine in your lap? -- wesley scott k...@spottedowl.biz ----- Original Message ----- From: "cartera" <cart...@cuug.ab.ca> To: "KRnet" <kr...@mylist.net> Sent: Thursday, June 24, 2004 1:52 PM Subject: Re: KR> KR structural analysis > Hello KRnetters, > You want to see analysis, take a look at my web site ;). > > larry severson wrote: > > >At 05:47 PM 6/23/2004 -0400, you wrote: > > > > > >>Did you ask her why you can't get the complete analysis? Can you get any > >>part of the analysis? > >> > >> > > > >The KR is a radio control model scaled up to one carrying people. It was > >not "engineered" at any time. The critical factor in the design is the wing > >spars vs the weight and G loading. Calculation of this information is > >fairly trivial with formulas in many book, including at least one high > >school physics book by Saxon Publishing. > > > >Of course, another factor is having a strong enough front end to support > >the chosen engine. > > > >Bottom line, don't waste time looking for a structural analysis - it > >doesn't exist, at least not from Rand Robinson and Jeanette isn't trained > >to do one. > > > Adrian VE6AFY > Mailto:cart...@cuug.ab.ca > http://www.cuug.ab.ca/~cartera >
