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  • Jan 26, 2015
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Hello everyone

I am building an ROV dynamic model but ideally I would like it to be informed by reality. The "problem" is that I do not have access to an ROV...and I can't experience its real behaviour which to me is important when you build a model of a vehicle.

Therefore, I am starting this topic here with a few questions that have come to my mind while working on this project and I would appreciate your help with.

1) I understand that the typical controls of an ROV are: Vertical (i.e. depth), Yaw (i.e. rotate around vertical axis), Lateral (i.e. move side to side), Pitch (i.e. nose up, nose down). But I have also read about the use of "Ballast". Is ballast used to keep the vehicle at a particular attitude (for example pitched down 15 degrees or rolled left 20 degrees) or is ballast used to control the depth only?

2) What is the weight ratio of an ROV to a typical gripper? Suppose that the ROV is trimmed for depth and is stable, how much reaction does the gripper impose on it? So, if I could swivel the gripper to the right, how much is the ROV expected to swivel to the left? Negligible amount? Considerable amount? (I suppose that hydrodynamic effects are negligible (?))

3) Are there standard grippers? How many degrees of freedom are they expected to have? I have seen simple systems which are just extend-and-grab or just grab but I have also seen pairs of grippers where the left is different from the right. The left gripper looks like a standard arm but the right gripper is much simpler. Is there a reason for this?

4) What sort of thrust are typical thrusters expected to provide? From a brief survey across manufacturers websites, I have something like 20kg, is that the general case?

5) How much of a factor in the vehicle movement is the tether? Can you turn around unhindered or do you have to constantly correct for the tether's pull?

6) What other sort of automatic systems can be found on an ROV besides Automatic Depth Control and Automatic Bearing Control? Also, does the Automatic Depth Control operate on the ballast or the vertical thrusters?

7) What sort of positive buyoancy are ROVs trimmed for? What sort of rate of ascent is expected?

Cool Why do you need 3-phase 400V power specifications? Is it purely because of the long length of the tether? (I suppose that the thrusters are simple DC motors (?))

I think that these would be my questions at the moment, short of asking for access to an ROV system Very Happy

Looking forward to hearing from you
May I enquire how much experience you have in the Plough and ROV industry ?

She's starting tae hud the line !!!!
The proliferation of different muliple repeating certs and medicals worldwide has become a big money making scam
Hi All

Does anyone know how to apply for a Norwegian seaman's discharge book?

Where a form can be found etc?

Many thanks
Raptor wrote:
jamesreid can you please remove the guys name from your reply !

The rules of the forum are no individual names - companies, yes


sorry will do so..
Beaufort12 wrote:
Thanks Ray,
They have paid tax, just not correctly. It more the annoyance of being sent somewhere to work then having to sort my own tax affairs out when they have messed up. Im waiting to see what happens then i might see if my union rep can earn some of his money.

Hi guys as what I know if you worked in Northsea less than 28 days per trip you dont have to pay tax.

I am from U.K and worked there a few times .
Dear all,

The Z-Boat 1800 is the best reviewed USV on Geo-matching. Read some of the reviews here:

"The Z-boat has been a valuable tool when performing work within an "ideal" pond scenario where the boundaries can be observed and there are no shallow areas causing hang-ups or groundings - setbacks of any remote controlled operation. The boat has been dependable and procduces good soundings. We've had a few high-gain antenna breaks and required adjustments to the propeller angles, but the system has been fairly stable."

"I can say how pleased we are with the Z-Boat. I went out with a crew yesterday to survey 2000 feet of canal that was about 60 feet wide. Taking 50 foot cross sections it took us three hours to complete. We would have been lucky if a crew doing them conventionally in a boat completed that in two days. The boat is very easy to control and keep on line. Much easier than our 23 Sea Ark. This was a very worthwhile investment."
Hi there, I am from South Africa, Cape Town. Recently graduated N4 electrical engineering. I would like to specialize in maintenance and tooling of ROV's. Which company can I approach for decent training?

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