Pardon my lack of knowledge, but I've wondered ..... isn't a mechanical type throttle system spring loaded in some way? I dont want to hijack the thread, but I've got a Torpedo 35 with carb ... always wanted to put it on a bashed FS but this detail has eluded me.
Thanks .... I enjoy looking at carrier plane pics up close.
Three line systems are not spring loaded. When properly rigged, all three lines share equal tension at all times. Imagine a normal bellcrank with two lines. Hook the pushrod to the throttle instead of the elevator. Now, replace the rear line with another bellcrank, this time connected to the elevator like normal. The elevator still works independently, but when you pull both elevator lines at once, the front line retreats and the throttle pushrod moves. It works great when rigged properly, but these days you can use a 2.4 ghz radio instead. Buy a cheap pistol grip car radio, hook up a throttle servo on your plane, hold the transmitter in your free hand, and have at it! Infinitely simpler, and probably cheaper than a 3 line system as well.