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Sep 18, 2007, 11:14 PM
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The post-Corona roadmap


So it seems the Corona is no longer made and what parts remain are drawing down the last inventory. Tail rotor shafts are already gone. When the Corona dies, we're going 2 need a different copter. Coronas have been replaced by smaller trainers for $100, aerobatic copters for $400, and anything with similar payload starting at $1600. All the new flight times are much shorter. Lacking any dollar/lb advantage below $1600, beginning 2 lean toward a 3 ducted fan replacement.

Estimated cost:

3 * EDF + motor + ESC = $1500
3 * 4Ah 11.1V = $300
2 * yaw servos = $50

Control mapping:
Cyclic -> mix of 3 fans
Collective -> total power
Rudder -> fan angle

Advantages: safer shrowded rotors can fly closer to people. Conversion 2 high speed fixed wing flight. Less vibration.

Losing the damping effect of a flybar makes this high risk.

Software yaw damping didn't go so well either. Small diameter rotors are notoriously inefficient. Avionics would B reused if the Corona was truly unflyable. Could start with cheapest propellers and upgrade to fans when proven.
Last edited by Jack Crossfire; Sep 19, 2007 at 02:29 AM.
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