what is the purpose of the 3rd channel in 3 ch radio?

[heinzeman]

sorry if this is a silly question, but much new 2.4ghz radio is 3 channel. Apsrt from steering and throttle, what is the idea behind the 3 rd channel?

[erkan]

trimplanes on a boat or brake mixing if you have a separate brake servo.. some people use it to start a fuel engine or control lights on like driftcars

[Col]

Personal transponders is the most common use in 1/10.

[big p]

if you had a rock crawler you can use it for the rear steering.

[ianhaye]

also used for reverse on some nitros

[Angel]

can be assigned to perform desired functionality e.g. activate a comedy car horn or perhaps radio jamming against your race opponents.

[dom-dogger]

Originally Posted by Angel

can be assigned to perform desired functionality e.g. activate a comedy car horn or perhaps radio jamming against your race opponents.

Or a big hammer or axe, like in Robot-Wars