Okay, I was happily flying (trying to) my heli, nice calm evening, then
suddenly lost control (this was on the ground luckily). Engine sped up,
rotors spinning faster and faster, but didn't take off (luckily), rotors
veered right and forward (towards me!) - I think the training gear caught on
something so it didn't slip (though the fact that there was no pitch
probably helped too!)
I thought it was radio interference and hoped I'd be able to regain control
and bring the throttle down but nothing seemed to be happening so we managed
to hold it down with a plank of wood (on top of the training gear). Then we
tried to pull the fuel line out with a stick to no avail. Then from the
other side tried to move the throttle, difficult being as the throttle servo
was still attached (though we weren't sure at the time). We decided to
retreat and wait for the fuel to run out (there was probably about 1/2 - 3/4
tank in there, though it didn't take long to burn at full throttle).
After investigation with a voltmeter and charger it transpires that the
batteries ran out quicker than I thought they would (probably due to the
mechanical gyro) so the receiver decided to pack up and kick the servos to
various positions before completely dying... luckily the pitch was thrown to
full low (ie. 0 degrees pitch on my setup while I'm learning) otherwise it
would have probably taken off and cartwheeled.
Anyway, what's the best thing to do in this situation (esp. if it's likely
to be running longer, or possibly going to take off under no control)? I
think it'd be useful to have some method of cutting the fuel line, but how
to do it - anything easy to make - something like a pair of 'remote control
scissors' on the end of the cane. Or a self-destruct button? :-) Obviously
the best idea's to make sure the batteries are charged, so I'm off to find a
battery indicator circuit to build...
Oh, and just to satisfy my dad, what's the funny thing at the front of a
Hirobo Shuttle ZX - it's a metal bar with a thumb hold on one end and piece
of *** on the other; 3in long through the servo tray (horizontally)
in-between the throttle and pitch servos. He seems to think it's some sort
of safety device... anyone know?