> >I have a tri-gear plans-built KR-2 with standard Diehl gear. Stub wing is >set at 3.5 degrees AOA in level attitude. With the tail skid pushed down 5 >inches off the level concrete, my inclinometer shows an AOA of 14 degrees. >With the tail skid on the concrete the AOA goes to 17.5 degrees. My >conclusion: I would stall the wing before the tail skid touches the runway. >Not accounted for is the low wing ground effect, static load on the gear and >use of flaps on the above data versus actual flight performance. I suppose >it would be possible to momentarily touch the skid to the runway by over >controlling with PIO. Another possibility is planting the tail on the >runway with max aft cg and full elevator deflection. >Sid Wood +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Mark Jones was the individual that posted saying he has had his tail touch on landing. His KR is a 2S so the longer fuselage would be closer to the ground in the same attitude. He is also flying the "new" foil and I have no idea what the "critical AOA" is on it. If he followed Langford's suggestion, he may have set his wing at less than 3.5 degrees, maybe closer to 2.0 degrees. I'm guessing his tail tie down ring is 1.5 inches in diameter. Also, if he hasn't lost weight since the last Gathering, his CG is a bit aft. :-) (sorry Mark, couldn't pass that one up. I'll owe you a beer at the next Gathering ) Larry Flesner
