Hello all. There have been two official changes to the OpenROV 2.6 kits and assembled units that are purchased through our webstore. I'd like to take a second to explain what changes were made, why, and how you can also make these changes.
Affects OpenROV 2.6 serial numbers 1400 and above.
First off, let me start by saying that we at OpenROV HQ had the pleasure of having some amazingly smart and talented folks here over the summer as interns. Most of the changes featured in this post as well as some of the cool things we are planning for the future builds on their hard work, intuition, and enthusiasm. I will credit them, and the work of others where I can.
The first change was started at the beginning of this year when one of our stalwarts, Walt, was trying to figure out a way to spend less of his time holding the "up" and "down" controls through deep dives that required long ascents and descents. His efforts along with no small amount of ingenuity on the part of Laughlin led to the development of a test for better, more efficient and powerful motor and propeller combinations. Through the hard work of our interns, Kevin and Zoe, we've arrived at a solution.
Vertical prop is now a Graupner 2303.57 57mm racing prop
The Graupner racing prop is significantly more powerful while still being efficient. This will allow drivers to dive and surface much more quickly.
Seen above are the three props now included with the OpenROV kit and fully assembled units. From left to right: Graupner models 2308.65, 2303.57(new), and 2308.65L (the L is for 'left hand rotation').
If you are having similar issues with deep dives, changing the props is simple enough. The 2303.57 can be bought on several webstores (even amazon.de), most of them in Europe. Modification to old ROVs is easy, as you simply need to break off the old prop and epoxy this one on. If you are having trouble sourcing the 2303.57, other sizes of the same 2303 family behave nearly as well and can be used as a substitute. Lastly, keep the c-clip from your motors, because these puppies are powerful enough to pull the bell right off the motor. If you've already tossed those in the bin, you can buy the part from the all-powerful McMaster catalog HERE. Check out the 2.6 Dozuki for instructions for further information on this.
The second change has been part of an ongoing feedback loop from our user base and community. We've seen lots of leaky battery tubes. Some of this is due to the forward battery tube endcap becoming dislodged or having a small leak that only occurs at depth...then on surfacing, the air pushes the cap out.
Larger diameter o-rings on battery tube endcaps
To help this, we are now using the larger #314 buna-n o-ring. To accommodate this, the acrylic parts to the endcap have also changed. This allows for a much better seal both initially and in shallow waters and at depth. We are hoping to get as much feedback on this as we can in the coming months.
You can see the new, larger diameter o-ring endcap on the right.
The larger o-ring engages with the sides of the tube much better, which hopefully will reduce leaky endcaps.
Upgrading your old endcaps would be recommended if you are having consistently leaky battery tubes. The new o-ring is available on McMaster as part number 9452K387. If you don't have access to a laser cutter, you can send us an email (firstname.lastname@example.org) and we will ship one to you. If there is enough demand for this, we may include an item on our store that would include all the parts you need to do this. If you do have access to a laser cutter, this part replaces two of the 3mm pieces. Check out the diagram below, with the new scheme on the left.
Thanks for all the feedback and help with these issues. Our development thrives on the direction and assistance of our community. While I would only recommend either of these two changes to folks who are having specific issues, feel free to reach out to us if you are having trouble implementing these changes in your own ROV. Also, please post on the comments section any feedback.
Thanks again to our hard working interns and our wonderful community contributors,