Archie,
Having worked with small ROV's that can do 4kts for more than 14 years (I'm pretty sure I know what system you are using...) I can tell you there are really only two times we've ever used clump weights. The first is if you are operating in a strong current and you want to reduce the drag on the ROV (i.e. you put the weight 20M back from the rov, this is your 'expedition' length. Now you aren't affected by the tether drag from the weight to the surface, only what is between the weight and the ROV). The second is when you don't want part of your tether rubbing up against something (say a hull).
If you are inside a fish farm net inspecting the nets or removing the morts, there really is no reason to clump weight the tether. If you have any questions feel free to PM me...
Chief
Having worked with small ROV's that can do 4kts for more than 14 years (I'm pretty sure I know what system you are using...) I can tell you there are really only two times we've ever used clump weights. The first is if you are operating in a strong current and you want to reduce the drag on the ROV (i.e. you put the weight 20M back from the rov, this is your 'expedition' length. Now you aren't affected by the tether drag from the weight to the surface, only what is between the weight and the ROV). The second is when you don't want part of your tether rubbing up against something (say a hull).
If you are inside a fish farm net inspecting the nets or removing the morts, there really is no reason to clump weight the tether. If you have any questions feel free to PM me...
Chief