Thanks Doug. Good to hear from you. No, the pilot weight is not in the 903 weight with full fuel. Plane was level at weighing. No when I almost lost it, there was only about 1/4 tanks of fuel each side. Yes on my weight.
Mark Jones KR2S (N771MJ) Cessna 140 (N1856C) Tampa, FL [email protected] www.flykr2s.com On Wed, May 20, 2026 at 1:40 PM Doug Steen via KRnet <[email protected]> wrote: > Mark, > Long time since we have met. I admire your work discipline to have built > two KRs! See my wt and balance calculations based on the fuel that was on > board when you weighed your plane. You should have leveled the plane > prior to getting the weights, otherwise re-weigh it and recomputte.. And, > did you have 24 gallons of fuel and yourself at 178 when you taxied? If > you want to calculate CG at different pilot and fuel weights, then you need > the fuel arm from the center of mass of the fuel and it might not be the > 46.5 inches indicated in your email. > > Doug Steen > wt LBS arm moment > L Main 319 67.5 21532.5 > R main 325 67.5 21937.5 > Nose 259 21.5 5568.5 > > Total 903 54.3062 49038.5 if 178 lb pilot was included in weights on gear > > > > > On Wed, May 20, 2026 at 12:12 PM Chris Pryce via KRnet < > [email protected]> wrote: > >> 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 >>> >> -- >> KRnet mailing list >> [email protected] >> https://list.krnet.org/mailman/listinfo/krnet >> > -- > KRnet mailing list > [email protected] > https://list.krnet.org/mailman/listinfo/krnet >
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