brav0, that esky tx and rx you posted a link to earlier, the rx is no good for you, unless you take it apart, and its then a real fiddly job to get it to work. You see in the link there are recommendations which helicopters it works with. The ones recommended are twin motor, coaxial helicopters, you will see on the picture there are the battery wires, then 2 x 2 pin plugs, one each for each motor. These rx's have inside 2 boards, one is a gyro, and one is the rx. You will have to split the boards, then fabricate pins to go on the rudder and throttle connectors, they are not standard sizes, much smaller, its very easy to break the pins or boards, its not worth the bother.
By far the best I have had is the turborix transmitter and receiver, 2.4ghz, tx is approx £30 with a receiver, and rx are £10, I have a few, absoolutely no problerms. The esky stuff is for helicopters, so throttle is not self centring, this isnt a problem with the boat you are doing as you will not want reverse, but if you get anything else that requires reverse, then you need another tx, instead of just another ten quid rx, even that tx requires a small mod moving a spring to get self centre
as for chargers, I have an imax b5, its great, the b6 is better, as for the small balance chargers that come with the helis etc, useless,they will take hours to charge your batteries, I speak with experience as I fly rc helis
