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        Discussion My blog continues ....... slowly

#1 martinjdw Aug 07, 2012 05:58 AM

My blog continues ....... slowly
I've just posted a new update to my blog, I'm averaging about 1 update every six months at the moment :)


Slow but sure ;)


#2 martinjdw Aug 12, 2012 11:06 AM

New post; motor shaft extension.



#3 nick_75au Aug 13, 2012 03:35 AM

Looks great, maybe a cone over the shaft extension to improve flow even further.

Your going to need a bigger tank:p


#4 martinjdw Aug 13, 2012 09:44 AM

Thanks Nick, I think you might be right, I'm banned from the bath though currently, after a small tantalum capacitor explosion :eek:


#5 martinjdw Aug 18, 2012 12:18 PM

2 Attachment(s)
It's starting to look a bit like a real ROV thruster now ..... sort of :)

24VDC, 80 watt brushless DC motor and controller built into the unit. My intention is to oil fill on my ROV and pressure compensate so there are no problems with depth. So far about 750g of thrust in quite a small tank so I would probably expect about 1kg in a real situation.

My intention is to make a vectored ROV with two vertical thrusters so I'm looking at ways of making the parts for all the thrusters as economically as possible (I already have the motors), aswell as the main control PCB and control box, again oil filled and also the frame/buoyancy.

Still lots to do but I thnk the hardest part on an ROV is the thruster design, we'll see ........ :cool:


#6 martinjdw Aug 21, 2012 09:14 AM

1kg of thrust!


With a vectored horizontal arrangement (i.e. four thrusters in a diamond shape) and a bit better water flow in a larger mass of water we should be talking about 4kgs of thrust at all four points, fwd, aft, port, stbd, I would hope :cool:


#7 hargard Aug 23, 2012 04:03 AM

Hi Martin.
NICE work..
Well done and thanks for shareing with us.
Keep the Blog going.
Regards Antony.

#8 martinjdw Aug 23, 2012 09:16 AM

Thank you Anthony,

I've now got to decide how I intend controlling the thrusters, turn on lights, cameras etc.

My inital thoughts are a USB gamepad into a small PC, maybe an SBC, Atom type board with a simple GUI (all at the surface), then an RS485 link to the ROV. I have been thinking about possibly using one of those Raspberry PI boards at the surface too as I'm into my retro computing, specifically BBC Micros, or maybe even a BBC micro :) 8 bit computers still rock :cool:

On the ROV there'll then be an oil filled box with a compliant lid (which can be used as a basic compensator) and a pressure tolerant PCB, taking the comms from the surface and distributing it to the thrusters etc on either an analogue output (maybe PWM into a capacitor .... but SPI or I2C DACs aren't that expensive these days) for speed, and a digital control for direction, or maybe just mutliple TTL RS232 links to each thruster.

Lots to think about and do .... time will tell I suppose.

Oh and six sets of thruster components to make and assemble, as well as decide how I'm gonna do the lights and camera and frame and buoyancy and tether :eek:


#9 martinjdw Dec 23, 2012 12:20 PM

Final post of 2012, slow but sure progress, I am a tortoise :D



#10 martinjdw Aug 17, 2013 09:36 AM

A few more new posts on my blog.



#11 martinjdw Sep 21, 2013 01:30 PM

A bit more progress today



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