My purpose in moving the main wheels 3 inches aft to 20 inches from the leading edge of the stub wing is to improve ground handling. The plan is to not dump on the tail when boarding or dismounting. Plus I can keep the nose wheel on the pavement on the bumpy taxiways at 2W6. Moving the main wheel 3 inches aft will move the cg about 0.2 inches aft; that should not make much difference in flight stability. The ground cg when I board or dismount does move to about 17 inches; that's why I need the wheels to be at 20 inches. Elevator authority at slow speed prior to take-off does not appear to be an issue. First high speed taxi will prove or disprove that theory. And of course I will do another weight and balance with my digital scales prior to any attempted flight.
Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD, USA > > Sid has his main axle distance 17" aft of the stub wing leading edge, Joe > has his 7" aft of the forward face of the main spar. Since the leading > edge > of the stub wing should 10.75" forward of the forward edge of the main > spar > they are essentially in the same position for a tri -gear. It seems to me > the difference is other loading aft of the gear. According to Sid's w&b he > is right in the middle of the range. I assume Joe's is the same since he > flies in balance. Going to the folks that like physics, something doesn't > compute. Moving the wheels aft would fix the ground imbalance but would > move the C.G. a little aft. > My thoughts, Larry Bell > > > >> I've built my own gear and I measure out at 18"s back from the leading >> edge to the axle center for the mains. 10"s from fire wall forward to >> axle >> center. >> >> Dan Prichard >> Portland Oregon
