Recent content by Aquasky

Hi, would like to ask - what's the formula to calculate "thin-wall cylinder subjected to external pressure"? Found these formulas - but is subjected to internal pressure. When a thin-walled tube or cylinder is subjected to internal pressure a hoop and longitudinal stress are produced in...

Hi joe, Nice to know you. Currently, my ROV housings were designed through solidworks and machined by CNC system (CAD/CAM). maybe we can even joint-venture later.

Hi Joe, I had emailed you and attached some of the details. We can share our knowledge.

Hi Joe, The links you shown above, seems like RC models parts. I'm not making a ROV for personal or entertainment use. The ROV I'm making now, may require for use in offshore pipeline inspection etc.

Hi Joe, Can the glue be able to hold at 100m depth? The motors that I used were BLDC motors & Stepper motors from Oriental Motor, the BLDC motor model is BLHM5100K-A. I bought it without gearbox, it came with its controller.

Hi Joe, Thanks for replying. I'm quite confused from the ways the sealing of the cables you describe. So far, I been experimenting two glues, 1) RT Resin and 2) Aquaseal. I tried to seal the cables with these two types of glues and place the cable in a moulding, both form a nice...

Hi Guys, I'm having some problems on my ROV designs. How do you seal the motor casing with the cables? Do you use underwater cable connectors? Is there other alternatives? I uses cable gland with the cables inserted through a metal pipe that can give the cable gland a good seal. Next, I'm...

ok, another thing is if the ROV weights 160kg on land. In water, at neutral buoyancy, how much weight/mass issit?

ROV weight estimation underwater Hi guys, I was wondering, if I maintain neutral buoyancy for the ROV at every depths, and the ROV weights 160kg, how much torque/ rpm is needed to move the ROV at neutral buoyancy and start off when floating on surface? Assuming two motors is required to move...

I had thought of using hydraulic cylinder sealing technique, which can restand fluid pressure of 3000 bars.

How do ROV obtain neutral buoyancy at all depths? The commercial ROVs uses "closed cell foam blocks under a quick release polypropylene shell", how does this concept work? Can I obtain neutral buoyancy using diver's Buoyancy Control Device (BCD) instead? Which method is cheaper or is there other...

does anyone knows whether aluminium profiles from Bosch automation, can restand sea-water? I thought of using aluminium profiles for body structure.

thanks for your advice fredGarvin

is there any low-cost actuators, powered by peumatics or electric, that I can use to "press" a switch under such depth? I also trying to find ways to "press" or "click" movement devices.

Hi guys, I'm also currently designing a ROV that can "dive" down to 100m deep. Looking at most of the underwater scooter's propeller designs, is it possible for me to use the "O-seal" with spring to seal the shaft? Can someone tell me how to what kind of motor can be "flood" by mineral oil?