What are you getting for a calculated CG for the aircraft in flying configuration? I would hope that it is 54.5 to 60.5 based on your Datum for your leading edge.
On Wed, May 20, 2026, 10:05 mark jones via KRnet <[email protected]> wrote: > HELP......I am so confused. My new KR WunderBird is ready to fly except > for the weight and balance. I have made many runs down the runway and on > one run I lifted the nose and she shot straight up to about 100' and I > could not push the nose down and she stalled on me. I was fortunate enough > to cut power and get her flat before she contacted the ground very hard. > Bent the main landing gear brackets and had to make more. I did some w&b > adjustments, repaired the gear and tried again. Still tail heavy. I am very > lucky I did not destroy the plane on that first flight attempt. So, here is > my challenge to anyone who wishes to figure a weight and balance on this > bird. I just want to compare others with my calculations. Here are the > parameters. > > Weighed with FULL FUEL: 12 gallons each wing. > Left Main 319 lbs > Right Main 325 lbs > Nose wheel 259 lbs > Datum measuring point: Front side prop Crush plate > Datum to nose wheel: 21.5" > Datum to Mains: 67.5 > Datum to leading edge stub wing: 46.5 > Datum to Pilot: 65" with pilot weight 178l lbs > > Thanks for any help. > > Mark Jones > KR2S (N771MJ) > Cessna 140 (N1856C) > Tampa, FL > > [email protected] > www.flykr2s.com > -- > KRnet mailing list > [email protected] > https://list.krnet.org/mailman/listinfo/krnet >
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