Would make sense to me to have two 9ch receivers, buy a second, plug them together and now it is 18ch dosnt take a lot of brain cells to work that one out!
I have heard of Giant scale planes running dual receivers with a power box set up so if one fails theother can take over.
I did not know that you can connect two together to make more channels.
A straight out 9,10,12 channel receiver etchas ports for the flight surfaces, accessories ports e.g. Brake, canopy open, bomb drop.
So if you connect two 9 channel receivers and connect your flight surfaces to oneand you need to put accessories into the other one eg, brakes in the aileron port how is it going to let you do that.
Do you understand where im coming from. Please excuse me if I haven't explained properly. Also im not saying you are wrong or I am rite. I honestly don’t know, and would like some confirmation on this.
If it is as simple as connecting to 9 channels together, well the problem is solved. Mind you I still would think its easier for spectrum to just supply to buy a 18 channel receiver. Otherwise for instance why bother with a 12 channel when you can use two 6 channels.