K9 Back On The Slipway:
Main slipway cleared following destroyer completion, the dockyard is now set up for the construction of my K9 to recommence. The submarine went on temporary hold late October whilst I pondered some basic sub-specific technical problems, and gained more model making experience building a surface warship.
Here are the main design problems I am working on. Sorry, it’s a bit long.WTC Positioning:
The WTC is a good fit in the hull section, but does have a limited fore and aft positioning ability. I know I have to get the balance point for centre of gravity and centre of flotation fairly exact otherwise it will submerge bow or stern first. I can build in supporting rib frames so as to allow fore and aft movement, but cannot connect up shafts or control linkages until I have got that right. I assume at this point I aim to get the framed-hull neutral ‘tip’ buoyancy and concentrate on the WTC ‘balance’ first. This appears to require building and commissioning the WTC first. Choice and weight of battery appears most critical.
If I start with a temporary dynamic diving solution then by the time I get that far into things there will be far too much to rip out and rebuild for static conversion.Internal Framework
I need a series of frame ribs to strengthen the hull, “U” slotted to mount the WTC, and also securely locate the upper hull. Matching inverted “U” frames in the top hull, and strengthening beams along the length of both. The ideal being locating lugs at the rear, along the joins, and a single thumbscrew fixing at the front (maybe a deck gun?). I could use either 3 mm ply or 3mm styrene, neutral buoyancy being a factor in choice of material.Control Linkages:
Unlike a Neptune or Engel ‘front end fit’ system, once the WTC is built in it cannot easily be removed without significant disassembly. Control linkages will run in tubes through the rib frames, especially to the bow as all servos are in the rear compartment. Bow hydroplanes need to turn and retract, plus control rod to geared funnels retraction. With the WTC so time consuming to get out, especially at a lakeside, ideally I could do with a means of turning on power and charging the battery that avoids disssassbly.
ie: Magnetic power switch, or stainless stud terminals with an external swivel “U” link. An extra stud for neutral, and I could charge battery using croc clips.
Finally:Static Dive System
The Caswell WTC comes with a gas bottle system, plus a snort system that I intended using the radio masts as air intakes for. However, I understand the gas capacity only allows for 2 to 3 surfaces, and if I slip below snort tube depth the snort will not work. Should I opt for a water-pumped bag system instead?
Am I thinking on the right lines here ?