Dean Goedde of Attopilot fame has posted development news. Tri-copter successfully flown with IMU AttoPilot in a stabilized and assisted attitude mode (Co-Pilot type mode). Planning to offer as a commercial product, likely as part of the standard IMU Atto autopilot system. GPS + IMU INS filter for heading (without magnetometers!) with uncorrected drift of 2.5 degrees per minute...
