Since the 18th Jauarary at the Bridport MRC exhibition I've been wanting to experimant with the guitar wire uncoupling
device used on the club layout.
This amounts to a length of guitar string set at an angle about 9 sleepers apart, one end firmly glued in place, the other
end fed into a fine tube. I have yet to decide on the 'right' angle, but somewhere in the range of 35 to 40 degrees. Every
coupling pair need small bars soldered to the bottom of the coupling hangar. As wagons pass over the coupling bars run up
the curved wire lifting the loose (compressed) coupling, then a very small shift back the other way releases what had been
the tensioned coupling allowing that to lift the hook clear. You can then move off having uncoupled hands free !!
Because one end of the wire is loose & in a small bore tube when a locomotive passes over the compressed wire will slide
down the tube. It is easy to draw re-coupled wagons over the ramp as the tensioned coupling hook will resist being lifted.
The video will probably show better than I have explained.http://youtu.be/eD0Vk6G422s
More development needed, but I'm happy with my first two modified couplings and the two ramps.