Aircraft with 27 MHz control

27 MHz

— an analogue standard that was quite popular for some time, but is now considered outdated — used only in the most affordable models, and even in them, it is gradually being replaced by the more advanced 2.4 GHz. One of the key drawbacks of 27 MHz is the difficulty in operating two remotes nearby: their channels may overlap, leading to a loss of control, and separating them by frequency requires purchasing replacement parts and fiddling with the remote's internals.