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Old Nov 28, 2013, 10:04 PM
TCIII is offline
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Autonomous Vehicles
United States, FL, Fort Lauderdale
Joined Dec 2007
321 Posts
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SRV-II Submarine Kit

Hi All,
Has anyone had any experience with the new SRV-II Submarine Kit that seems to be an upgrade for the original SRV-I Submarine Kit.
This submarine is radio controlled, but probably could be easily converted to a tether. It has its own onboard batteries so the tether would be only for communication and video making it fairly light weight.
Shaneperch over on the Submarine Forum had started a SRV-I build thread, but never completed it. I have tried contacting him by email, but so far no response.
Regards,
TCIII
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Last edited by TCIII; Nov 29, 2013 at 11:28 AM. Reason: Always an afterthought:-)
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Old Nov 29, 2013, 06:50 PM
TCIII is offline
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Autonomous Vehicles
United States, FL, Fort Lauderdale
Joined Dec 2007
321 Posts
Hi All,

I have contacted Cliff Walker, the SRV-II manufacturer, and found that the SRV-II Submarine Kit can be purchased for $400, sans R/C equipment, + shipping.

I believe that this ROV cannot be home-built for the same price. Cliff claims that it can reach a depth of 100 ft without leaking. I think that this ROV could be a very viable basis for either a tethered or autonomous ROV.

As an autonomous ROV it could be guided by an APM (Ardupilot Mega) using the compass and IMU for navigation after taking a position fix with the GPS before diving. The deck on the ROV is big enough to support a sealed GoPro camera so that video can be recorded for a review after each waypoint mission.

On a tether it could use the APM to provide spatial stability and a FPV camera could be installed in the bow bubble window and transmitted up a two wire pair, using baluns, for viewing on the surface.

Regards,

TCIII
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Last edited by TCIII; Nov 29, 2013 at 09:25 PM. Reason: Always an afterthought
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Old Dec 07, 2013, 12:24 PM
TCIII is offline
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Autonomous Vehicles
United States, FL, Fort Lauderdale
Joined Dec 2007
321 Posts
Hi All,
After talking to Cliff Walker about his SRV-II Submarine Kit, I decided to order one and it should arrive here in Ft Lauderdale by late next Friday or perhaps a week from this coming Monday.
Cliff has been very helpful in explaining the assembly and operation of his SRV-II and I would recommend him and his products to anyone who is seriously considering putting together a quality ROV without having to go out and purchase all of the pieces individually.
Regards,
TCIII
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Old Dec 25, 2015, 02:50 PM
TCIII is offline
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Autonomous Vehicles
United States, FL, Fort Lauderdale
Joined Dec 2007
321 Posts
Hi All,
I finally manged to put my SRV-II in my Association's swimming pool that is all of 5 feet deep.

Since the SRV-II does not come with any R/C equipment I used a Hitec Laser 6 75MHz setup that is designed for R/C cars that I had laying around.

Installing the R/C receiver in the SRV-II hull was not too difficult as the inside tray from which the two batteries are suspended can be slid out of the rear of the SRV-II chassis. Once I got the receiver hooked up to the elevation servo and the V-tail mixer that combines the throttle and aileron channel outputs I was ready to go after charging up the two onboard batteries.

Cliff Walker, the SRV-II builder, claimed that he had ballasted the SRV-II chassis for near neutral buoyancy. Unfortunately that was not quite an accurate statement as once it was placed in the pool it promptly sank to the bottom. Fortunately I was able to drive it back to the surface though the radio signal was kind of a little flaky.

Back on the bench I removed one each of the two 1/4" diameter steel rods that were in the two chassis skids which act as ballast. Returning to the pool, the SRV-II became slightly awash when placed back in the pool. At this point I would say that each of the rods that I removed need to be cut in half and returned to each of the skids to get a properly ballasted SRV-II chassis. Anyway I was able to drive the SRV-II down to the bottom of the pool using the twin propeller drives on each side of the chassis. However I had to constantly be driving the chassis downward to keep it from rising to the surface. I think that adding a slight amount of built-in down angle to the twin propeller drives will keep the SRV-II chassis from trying to rise towards the surface when driven forward or making turns.

All in all, I would say that this is a fun little submersible, however do not expect to dive any deeper than 5 feet when using a 75MHz R/C setup due to signal attenuation beyond that depth.
Regards,
TCIII AVD
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Last edited by TCIII; Dec 25, 2015 at 07:39 PM. Reason: Always an afterthought
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