Hi Ian

I use the Turnigy IA6 which is the same as the Flysky A6.

Very happy with the unit.

Note the mode 1 or mode 2 is the throttle for IC engines and no self centering.

I got a mod kit from Banggood to make it self centering.

The dearer V2 receiver with the plug sockets on the side.

Six channels and the two on the top end, one is for sensors for temp, voltage and rpm.

If getting the sensors make sure the are the standard servo ones and not the small socket ones.

I have used Futaba for 45 years – starting with a 2 channel 27Mhz that still works today.

Now I use Futaba 2.4 GHz 10CG 10 Channel Radio. It has a 15 model memory. Apart from the main 4 channels on sticks there are 3 variable knobs and 2 variable sliders so extremely useful for ships and boats.

You can assign channels to the particular knobs and switches, change the amount of travel and mix the channels so you can have master and slave channels etc. It is capable of lots more useful things than I have written here.

For my submarine I use a Futaba 29MHz FM 'Gold' system from the 80's.