Sorry, nothing to do with fishing.
I have an idea for a release mech for an rc airplane.
A small super-magnet surrounded by a coil. The magnet holds whatever is to be held. The coil makes a magnetic field that cancels the magnet and whatever was attached falls away.
First, can I make a coil that will do that - shape, power required? Magnet weight would be 5grams or less.
Second, the coil only has to be energized for a fraction of a second. Every gram counts - how much can I reduce the coil wire guage because it won't have enough time to heat up?
Third, if enough not current is available from the battery to run the motors/electronics/etc AND fire the release coil what/where's a simple circuit to charge a cap and then dump it? I'll have power, gnd, and a signal wire that will either be 0 or whatever the single cell lipo is (3.7-4.2).