Why isn't the open rov shaped like a real sub?


#1

i am curious about the shape, why isn't it shaped like a real sub?


#2

There are a couple of reasons. Traditional submarines ( Like u-boats, nuclear subs, etc) have a much different purpose than ROVs. Traditional submarines (subs) are usually used for long distance work. This means that hydrodynamic efficiency is a primary design constraint. Because they have a long distance to go, the most efficient design saves fuel, which allows a longer travel distance. As well, the cylindrical shape has some properties which help with strength.

With a long cylindrical shape designed for speed and distance, manuverability takes a hit. ROVs are usually used to view or manipulate something, which requires a high degree of manuverability.


#3

Jesse, fully agreed.

Davy:

Beside everything explained by Jesse, there is also a dimensions problem.

The "ideal" undewater vehicle, has an ellipsoidal bow and a pseudo-parabolloidal stern section. Main proportion is 1/7, meaning that total lenght is seven times maximum beam.

A so shaped ROV, would have, quite big construction difficulties, that are not worth for a ROV normal use, beside a big amount of wasted volume and possitive flotation issues.

Anyway, hydrodynamics cannot be neglected, and Im with you in the sence that can be improved.

I must point that holding key qualities(simplicity, manouverability, versatility, low costs ...) while improving hydrodynamics, is not an easy matter.

Regards


#4

I would think a sphere would be ideal. Fit it with a 360 degree camera at the top, use the middle for batteries and electronics and the bottom for buoyancy control.

Here you go: http://ee.lamar.edu/SphericalSub.jpg


#5

maybe move the battery to the bottom of the ball? just cause its going to be heavy and keep it at the center of the ball makes it very unstable.


#6

Good point. I have moved to a cylindrical design with no buoyancy control.