Always fancied building a submarine. But never quite got around to it, as they always looked so complicated. With wet bits, dry bits, and some that crossed over occasionally. That, and the cost of the perspex tubes they are built into and out of. Also, you need quite a big model to base it on as well. One big point is, I don't have access to a school swimming pool to play with it in, as I'm too scared of losing it in a lake 😔
Good luck with yours.
Kindest regards, Dave W 👍

Like your sub!! We have several sub guys in our club, at least one of them uses 2.4. He runs an extension for his antenna up the sail (conning tower) and hides it in either the periscope or antenna. His boats are static divers, but he stays at periscope depth when he submerges. The boats set up to blow ballast and full up planes if he loses contact. Not trying to criticize anything you’re doing, just letting you know 2.4 is doable with restrictions. Most of the ponds here in North Texas are too murky for much below periscope depth anyway.
Anyway, good luck with your sub! Let me know how it turns out.
Cash

I had thought of a float with antenna but in he end use a MHz transmitter was easier. I had sold all mine so I picked up one from eBay. Actually I wound up with two one AM one FM. FM worked better. The dc motor controller was from a car as it had reverse capability plus switchable micas or LiPo. The Ghz band gets water attenuation so it won’t work under water well. Bathtub test showed at least a few feet under was ok. Only thing o don’t like is you seal electronics so it has to be really tested. Battery is on a plastic box like that can open fir access but I put a soda bottle cap structure to access charge connector anyway it’s fun