Photos

OpenROV 2.2 is 300mm long, 200mm wide, and 150mm tall.  It displaces approximately 2.5kg of water and has a theoretical depth capability of approximately 100m.

(Photo Credit: Sam Kelly)



A single (90mm ID by 180mm long) waterproof tube houses all electronics and other equipment that must be kept dry.  Equipment in the tube is mounted onto a rotating platform that can tilt up and down.

(Photo Credit: Sam Kelly)



Three 700kv brushless motors power the ROV.  Two horizontal thrusters allow the ROV to move forward and aft as well as rotate, and a vertical thruster allows the (neutrally buoyant) vehicle to change depth.

(Photo Credit: Sam Kelly)

Each OpenROV has a unique, sequentially given serial number.

The waterproof tube can be removed from the ROV structure while still attached to the external electronics for easy testing and modification

(Photo Credit: Sam Kelly)

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Comment by Stills & Frames on December 8, 2012 at 9:01am
would the rov work with a professional underwater housing for sytemcamareas instead the acryl-tube....
Comment by Marius Antares on November 26, 2012 at 1:50pm

Need to know differences between 2.2 and 2.3.....

Comment by John Rushworth on November 7, 2012 at 8:13am

Re motors. Any speed control or simple on/off? Assume you matched max motor efficiency v current draw and max torque to prop pitch/dia/number blades? Like the Kort type nozzle. Having to figure same type of stuff for my electric yacht conversion. I'm using a brushed Lynch PM motor. Makes the electric motors from 1977, on the ROV Consub 2 (built by British Aerospace and operated by SubSea Surveys I worked on, look like dinosaurs.

Comment by Al Cast on October 19, 2012 at 10:24am

Yeah Eric, at first I thought it was a typo.

Later I went to the hobby king site and found that they are using German Electrical nomenclature such, as you stated, RPM/V.  In the US we do not use such thing. We simply say RPM at Rated V

For a long time I have been wanting to manufacture an enclosed, waterproof, BLDC motor in an aluminum or SS case. (for more advance ROVs)  One model would even have a Gearbox to torque down from higher RPM.   Yet another with a Gearbox and an Archimedial screw, not more than 3 spirals long in a tight fitting conduit for Positive displacement.

I do have a machine shop and I am retrofitting a CNC lathe.  I have already finished retrofitting a CNC Bridgeport Mill.   This of course would be for taking the ROV units to a higher level. 

Comments/input from any member welcome.

Comment by Eric Stackpole on October 19, 2012 at 9:47am

"kv" is the voltage constant (k is just the variable used for that constant- it has nothing to do with "kilo").   Generally, the kv rating describes how many RPM the motor will spin per volt.  For an 800kv motor running at 12 volts the the theoretical speed would be 800*12 = 9600RPM.

For OpenROV, (or any underwater vehicle using brushless motors) one would want the lowest kv rating possible since in water you need more torque and less speed, and lower kv values use energy more in that favor.  800kv was the best we could find in a low cost, easy to mount, readily available package.

Comment by David Lang on October 19, 2012 at 7:31am

You're right - should be 800kv. As listed on the BOM -> https://docs.google.com/spreadsheet/ccc?key=0Ar0hfvA_8EUVdFBnQm8tdm...

Comment by Al Cast on October 19, 2012 at 2:45am

In this page

What is "Three 700kv brushless motors"

Does it mean 700mV ??? or what unit is being shown?

Comment by Patrick on October 2, 2012 at 1:00pm
How do I get started, I'm new to all this and would like to know what I need to go for beginners. If u have info please let me know. Thanks
Comment by Joseph Rosenberger on May 15, 2012 at 2:46pm

Looking forward to seeing you at Maker Faire this coming Saturday. It's a remarkable advance in underwater exploration, and will find its way very quickly into hundreds of applications and purposes. Congrats to all of the members of the OpenROV team. Keep innovating, as you have the potential for an "insanely great" device.

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