David

I do have a catamaran ... I'll try and take some pictures this weekend. It's very quick but very sensitive to puffs. I'm reworking the rudder system to get more motion out of the rudders because the boat doesn't steer fast enough right now.

In this boat, the radio receiver will be mounted in teh center of the hull on a plate off the bottom of the boat. A portion of the deck will be removable and will be held in place by a decal that is shaped to the perimiter of the hatch. The boat should be so watertight that that will be all we do there. The on off switch will be connected through the **** bulkhead by a small piece of rod with a ball on the outer end so it's not directly exposed.
The charging jack will just be mounted on the same bulkhead with a rubber insert.

Typically, however, like in the catamaran...the receiver is in a plastic bag with a couple of rubberbands surrounding the area where the wires come out to the batteries and the servos. By and large, the servos and batteries are water resistant so if you can keep them from being submerged, they'll be fine.