Kenny: I downloaded it from the net for the best price of all--- Free! Just type in "AirCalc" into your search engine and I thik you will find it. I stumbled on it it while looking for ways to to lower the stall speed of wings using L.E. slots/slats. I think I have the back up for it as well. You will need (3) of the following: the lift Coeff.of the airfoil you use, Gross Wt, Wing Area and stall speed. Just put in (3) of the (4) as knowns and it will solve for the remaining one.
The outer wing panel on KR2- non stretched fuselage- is 94 inches long, 48 inches @ the root(STD.) and 35 inches at the interface with the premolded composite tip. You can get the the Lift Coeff. off the net(I believe from a KRnet source) and it is between 1.5 & 1.6( I used 1.6 to develop the gross of 887# for my wing) Some KR netters have statedoff the record that they have operated their craft at Gross weights approaching the 1320# Gross Wt. limit but all have engines and craft that fly faster and wings with higher stalls than are acceptable for light sport. I even went so far as to contact the FAA folks in Kansas City that have some oversight of experimental aircraft and they are the ones that told me that what is importent is evidence that the craft in question meets the Light Sport requirements. Max & Stall speeds Gross weight Fixed Gear(I suggest Tri-Gear for added drag) Ground Adj. Prop. The challenge is the Max and Stall Speeds--- Getting the bird slowed down. I got into this because the set of plans I have had since 1976 stated the stall as 42 mph and the top was 150 mph as a retract TD craft with a 1600 cc VW based engine. I observed that all more recent specs listed the stall as 52 mph and the top speed well above the 150 mph so I began to investigate in ernest be fore I started. My opinion is that it is still a close one to call and so I am "rolling the dice". I feel the worst that might happen is that I'll have to move the engine set and avionic and instr. to an applicable airframe but really wanted something with the speed, range and fuel consuption that the KR2 would offer. I would recommend the "S" version however based on what the KR netters have said RE the benefits of the longer moment arm aft of the CG. Don Lively Burlington IA 52601 ------------------------------------------------------------------------ JAMES C FERRIS wrote: > Hi Don, Where did you getthe AirCalc program and how much did it cost? > i would like to try it, I don't think its a big deal to redesign the KR > to be an LSA and call it something else. > sincerely > Jim > On Tue, 02 May 2006 09:54:42 -0500 D F Lively <riksh...@interl.net> > writes: > > Kenny:: > > > > I have taken over a KR2 project and am kind of "Rolling the Dice" > > on this one. The craft must meet of couse meet all of the > > requirements of the "Sport Plane" catagory. The most difficult to > > achieve of these to meet is the > > construction of the craft so that its top speed "clean" in level > > flight doue not exceed 138 mph(120 kts) nor does the stall speed > > "Clean" exceed 51mph(44 kts). I think this will be impossible to do > > with an engine larger than > > the 1915 cc Great Plains engine or maybe even their 1835 cc engine. > > I also think that will almost be mandantory to build it as a > > tri-gear in an effort to get the speed down. From the stand point of > > stall speed you will almost > > need the longer wingspan of the KR2s and even with that I found that > > wing area would limit your gross weight to 887# acording to the > > "AirCalc" program.(Downloadable from the net). The standdard KR2 > > wing will force your max. > > allowable gross weight down into the mid 700# range to get to the > > 51mph(44 kts) stall speed which effectively makes it a single seat > > craft. I spent about 4 to 5 months exploring this and it is a close > > call and be advised that > > the KR2 as a sport plane is not on the approved FAA list so it will > > attract a lot of scrutiny for sure. This most likely because it was > > originally designed as a fast retractable craft and most are built > > with engines to > > powerful to keep the speed down as the design predates the LSA > > catagory by 30+ years. > > > > What ever you do join your local EAA chapter and work with the > > chapters EAA Advisor/Counsulor. > > > > Good Luck and get in touch with your local EAA before you start. > > The importent thing that the FAA cares about is that you meat the > > requirements of the LSA catagory. > > > > Don Lively > > Burlington, IA 52601 > > > > > ------------------------------------------------------------------------ > > > > af...@att.net wrote: > > > > > Hello all, > > > > > > Is anyone out there in KR land considering (or now building) a KR2 > > that would meet the qualifications for LSA certification? I made a > > search of the archives but there didn't seem to be a lot there as > > far as LSA and KRs go. > > > > > > I am also considering the Sonex. I just want to be sure before I > > tear off down the wrong path for several years of building. > > > > > > Thanks, > > > Kenny > > > > > > -- > > > Jesus, who do you say He is?!?! > > > John 3:16 > > > _______________________________________ > > > 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 > > _______________________________________ > > 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 > > > > > > _______________________________________ > 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
