I just read this post... http://diydrones.com/forum/topics/waypoints-and-failsave
CAA rules apparently say... (as of Feb. 2012?) http://www.caa.co.uk/docs/33/CAP658.PDF
Any powered model aircraft fitted with a receiver capable of operating in failsafe
mode should have the failsafe set, as a minimum, to reduce the engine(s) speed
to idle on loss or corruption of signal.
Because of a recent post about a lost fly away quad a design flaw in the APM has come to light wherein the APM holds the last setting (highly unlikely to be idle) upon the loss of throttle signal input. This happens on many receivers when they lose signal or could happen if a signal wire came loose. Apparently this isn't easily changeable behavior and is the normal failsafe mode.
Am I missing something or does this make the APM completely illegal to operate in CAA countries? Hopefully there's some loophole that I missed somewhere.