Another item that was going to form the basis of a magazine article but I'd rather it not go to waste.
Radio Controlled submarine models do represent something of a challenge to the average modeller. It not hard to see why this is so since they do appear to be expensive, full of more complex items than the usual RC model boat. Plus, any tiny failure or mistake that in a boat model might just leave you with the embarrassment of having to ask a fellow modeller to push you back to shore but, with a submarine model it could disappear and be lost forever......
However, there is always the 20/80 approach to this part of our hobby, that is 20% of the cost/effort which can still give you 80% of the fun. This refers to the Dynamic Diving type of RC submarine model. This is where the forwards motion drives the model underwater and if the motor stops, the model should resurface by itself. These are often decried as not "true" submarines and can be tricky to keep submerged all the time.
I'll have to agree with the first point if you consider the ability to remain stationary underwater and out of everyone's sight as essential. But, with a little cunning the latter problem of depth keeping can be overcome as a series of five such models has proven, photos of two attached.
The first thing is to realise that dynamic diving models need very little buoyancy if they are to work. This means that they should float with their decks almost awash, Fig 1. This may worry some but the volume of water displaced when the decks and conning towers submerge ought give you enough extra buoyancy to ensure the model will "pop back up". Ballasting trials in the bath should give you this confidence.
Glynn Guest