Yes I see what your saying the platter motors have such a relatively large diameter that using three will present some problems fitting abreast in a warship hull. I'm still keen to use them as I have a plentiful supply of them and I can easily get many more. I think their large diameter leads them to be generally low rev'ing and smooth, I think they'll fit and I have dreamt up a mounting scheme that should work - a bit up in the air though a bit more thought required to bottom that out
.
I have amassed a collection of the various motors from CDROMs I've put the tiny stepper motors to one side for special use later!...
I'm not a smoker myself, but shouldn't take too long to scrounge some flint springs - I'll try that tip - cheers.
Like a few other build threads that have inspired me I'll just blog my way through my build, hopefully some of it may be interesting to others and I encourage the more experienced to make suggestions or point out obvious mistakes that I am blundering towards ::).
My idea is to build up a small fleet of plastic models to sail at my local pond which is well sheltered on all sides by tall trees. The first thing is to decide how I'm going to power these boats. I've just recently got interested in electronics and programming pic chips - so I'm wanting to build a custom speed controller as part of my build. I've bought a Heller 1/700th scale model of the Gneisenau to prototype the electrics, it was cheap and has plenty of room inside for prototyping things like speedcontrollers.
I suppose the main physical constraints are size (it has to fit in the hull) and weight - the boat must float! I plan to fill the hull with water up to the waterline and then weigh the water to give a rough idea of a max weight for the equipment -is there an easier/better way?
I've chosen to use my existing LiPo packs, they're a powerful and lightweight powersource, using such light cells buys me some room to go a bit heavier elsewhere.
I've used two L298 motor drivers mounted side by side on a board to make a motor driver capable of driving 4 motors upto 50v with upto 2amps current per motor. You can see the unit in the center of the hull in the picture. It's a bit ugly but it's only a prototype and so far it seems to work well. With independant control of four separate motors it would be suitable for a Yamato but I'll only use 3 of the 4 channels for the Gneisenau. I'll build a controller with a single L298 for the two prop Mikasa.
The L298 is just a driver and needs a 5v PWM signal to provide the control to each motor. and that will be produced by the pic chip - I've recently moved to the 18F4331 chip as this has a motor controller capability that provides the generation of 8 PWM signals which is ideal for my twin L298 controller board as that needs 2 PWM signals for each of the four channels.
I've only had these new 18F4331 chips for a week and I'm still writing code...