The safe thing to do is test your CG range with moveable ballast. I initially operated in the recommended 6 inch range. I decided to test and expand that range with moveable weights. I've successfully tested my range to 6.75 inches aft using 100 lbs of rocks in the seat and 30 pounds of weights that I took off with in front of the spar and then moved to behind the rear spar. This gave me an opportunity to take off in a known stable CG and then test it farther aft at a safe altitude. After feeling out the controls, I was able to verify that I could land at that CG. This allowed me to test the controls before taking on a bigger passenger. After testing, I have successfully flown with two American sized adults and a reasonable amount of fuel for cross country.
That being said, I have a strecthed KR-2S with a Corvair...as Larry says, your results may vary. Chris Pryce Vacaville, CA ________________________________ -Please see LIST RULES and KRnet info at http://www.krnet.org/info.html -Change list delivery options at https://list.krnet.org/list/krnet.list.krnet.org/ Affinity List Info Board -Search recent KRnet Archives at https://list.krnet.org/empathy/list/krnet.list.krnet.org/ -Search John Boyea's decades of archive at https://www.mail-archive.com/krnet@list.krnet.org/