"Bill, you might be interested to read the paper "Magnetometer Autocalibration Leveraging Measurement Locus Constraints" by Prof. Egziabher in the AIAA Journal of Aircraft, Vol.44, No.4. The algorithm he proposes solves for hard iron bias,…"

"In theory you only need 3 points, but in practice, due to measurement noise, it would be preferable to have an overdetermined system that you can then solve by least squares or by a recursive algorithm such as a Kalman filter or the fixed-gain…"

"Any idea what is the role of the white triangular fin on the rear part of the combined Pitot/alpha/beta probe ?"

"Gary: A static margin of 10 to 30% MAC is reasonable. The more stable the aircraft is statically, the more control deflection is needed to maneuver or change flight condition. You can't really compare, in terms of mass distribution, the…"

"Judging based only on this picture, it seems this airplane has a serious design issue. A canard configuration with rear-swept wing results in a neutral point location too far behind the CG, making the aircraft too statically-stable in pitch. This…"

"The discontinued chip u-Blox TIM-LP works for sure. I've flown it up to 100,000. No idea about the newer u-Blox products."

"Another way to handle the integrator windup is to design a nested-loop control law: your inner loop drives the rudder with integral feedback of turn rate error, and your outer loop generates the turn rate command by proportional feedback of heading…"

"I recall the full-size version of this aircraft requires a significant amount of rudder trim (5 to 10 deg.) to fly straight, due to the prop wash on the vertical tail. Therefore, you will probably need to set some throttle-to-rudder mixing if you…"

"In the section of your paper where you talk about the accelerometers, you mention that these sensors measure gravity minus inertial forces (aero and propulsion). I believe the wording in this statement is incorrect. The accelerometers only measure…"