ROV thruster with DT700 motor 4.78 kg trust

Help & Support Robot Parts
1

[size=2][font=Arial, Helvetica Neue, Helvetica, sans-serif]This is 3D printed [font=inherit]Kort nozzle[/font] designed for DT700 / DT750 motors.[/font][font=Arial, Helvetica Neue, Helvetica, sans-serif][highlight=#ffffff]Specifications:[/highlight][/font]
[/size][hr][/hr][size=2][font=Arial, Helvetica Neue, Helvetica, sans-serif][highlight=#ffffff]www.rovthruster.com

Tested forward/reverce thrust at 12V[/highlight][/font]
1A - 0,5/0,5 kg (0.5/0.5 lbs) [/size]
[size=2]2A - 1,0/0,9 kg (2.2/1.98 lbs)[/size]
[size=2]3A - 1,35/1,2 kg (2.98/2.65 lbs)[/size]
[size=2]4A - 1,65/1,5 kg (3.64/3,31 lbs)[/size]
[size=2]5A - 1,9/1,7 kg (4.19/3.75 lbs)[/size]
[size=2]10A - 2,5/2,1 kg (5.51/4.63 lbs)[/size]
[size=2]14A - 3/2,7 kg (6.61/5.95 lbs)[/size]
[size=2]19A - 3,6/3,2 kg (7.94/7.05 lbs)[/size]

[size=2][font=Arial, Helvetica Neue, Helvetica, sans-serif][highlight=#ffffff]Efficiency (G/W) Thrust (G/Watts) (lbs/Watts)[/highlight][/font][/size]
[size=2]at 1A:[/size][size=2]41 g/w (0.09 lbs/w)[/size]
[size=2]at 2A: 37 g/w (0.082 lbs/w)[/size]
[size=2]at 3A: 31 g/w (0.068 lbs/w)[/size]

http://https://www.robotshop.com/forum/https://i.stack.imgur.com/LJ5F7m.jpg
[size=2]We use 6 of them in our ROV “AVATAR”[/size]

http://https://www.robotshop.com/forum/https://i.stack.imgur.com/eHXWCm.jpg

[size=2]As an experiment we also tried these engines even as an underwater arm thrusters.[/size]
[size=2]At a current of 15 amperes per motor, the speed is 1.85 mph with a swimmer weight of 166 pounds.[/size]
[size=2]http://https://www.robotshop.com/forum/https://i.stack.imgur.com/0PhQVm.jpg[/size]

[size=2]We seldom use them at 20A cause big current means very short battery run time.[/size]
[size=2]If you will use them at high power you should prepare DT700 for it.[/size]
[size=2]Our test show this two small screws can not keep the motor from turning at maximum load.[/size]
[size=2]Even if you screw them hard they cannot make a good hole.[/size]
[size=2]This can lead to a break in the wires and damage to the motor.[/size]

http://https://www.robotshop.com/forum/https://i.stack.imgur.com/jbdefm.jpg

[size=2]It’s recommended to drill a sink:[/size]
http://https://www.robotshop.com/forum/https://i.stack.imgur.com/Y2AX3m.jpg

[size=2]Although most brushless motors can work in water, it is recommended to make some modifications (even included Blue Robotics). Over time (after 100-1000 hours) microscopic damage appears on the wire’s protective coating. Leakage of current through these holes can lead to malfunctions in the ESC or RC controllers. Moreover electric current into these holes causes electrochemical corrosion, which leads to a rapid destruction of the wires (after 10-100 hours). To prevent this we should impregnate the wires with epoxy. The engine will operate underwater with increased power (5-10 times the nominal!), so it is necessary to ensure a good heat dissipation. To do this, choose an epoxy with a high thermal conductivity.http://https://www.robotshop.com/forum/https://i.stack.imgur.com/UvBZHm.jpg

[/size]
[size=2]Forward and back thrust is almost the same.[/size]
[size=2]In the event of a breakdown of the propeller it is very easy to replace it even underwater.[/size]
[size=2]Our robot has made more than a hundred dives with these thrusters and they have proven themselves very well.[/size]
[size=2]We use batteries on board and thanks to a small current consumption our robot works 6-8 hours continuously without changing the batteries.[/size]

2

Can you offer some insight into the salt water affecting the motor / coils? Do you clean them with fresh water after each use?

3

Of course, after immersion in salt or heavily polluted water we have to wash all the moving parts with fresh water. The crystals of salt formed during the evaporation of water can lead to mechanical damage to the motor
And as already written above, the motor wires are covered with protective varnish, but we know from experience that this protective layer will be destroyed by rapidly moving water and sand. To protect the wires pour them with epoxy. As an additional precaution I also recommend replacing the motor bearings with bronze sleeves.

4

Previously, we tested it in a 300-liter bath and strong turbulence prevented us from obtaining stable and accurate data.
Now we did a test on the lake and got a higher thrust value. Upto 4.78 kg (10.5 lbs) (46.5 N) at 12V 25A.

DIY ROV thruster from DT700 brushless motor. Homebuilt rov thruster testing props. 3D printed Kort nozzle.
instructables.com/id/ROV-Thr … ess-Motor/
Thrust: 4,78 kg (10.5 lbs) (46.5 N) at 12V. Efficiency: 52 g/w (1.83 oz/w) more than Blue Robotics T200!

Specifications:

Tested forward/reverce thrust at 12V 0.8A - 0.5/0.5 kg (1.1/1.1 lbs) 2A - 1.0/0.9 kg (2.2/1.98 lbs) 3A - 1.35/1.2 kg (2.98/2.65 lbs) 4A - 1.65/1.5 kg (3.64/3,31 lbs) 5A - 1.9/1.7 kg (4.19/3.75 lbs) 10A - 2.5/2.1 kg (5.51/4.63 lbs) 14A - 3/2.7 kg (6.61/5.95 lbs) 19.5A - 4/3.8 kg (8.8/8.38 lbs) 25A - 4,78 kg (10.5 lbs) (46.5 N) more than Blue Robotics T200!

DT700 ROV thruster testing

5

What motor controller/control scheme was used to actuate the motors?

6

We usually use this one:
aliexpress.com/item/Racing- … 0.0.iB36TR
But can be used any controller with Forward/Reverce function.
More informations on our site www.rovthruster.com

7

Would it be possible to gain a sponsorship from the makers of this part? It seems like it could be 3D printed. I ask only for the file and will sign documents or whatever might be required not to release them. The reason I ask is because I must make an ROV for a school project.

8

We offer this one Kort nozzle for free for everyone who made an instructable with our thrusters. You get two of them if your instructables became Popular or even 3 for the main page. So you can buy just one then write about your project and get the other for free with free shipping. Moreover you can write a few instructables and get free nozzle for everyone.

9

Could you please provide a wiring diagram with the ESC recommended?
Or a picture? Thank you!

10

Do you mean a ROV wiring diagram with the ESC? If yes, they all near the same but depend on your Arduino or something you will use. We are making our ROV step by step instructable with detail diagrams hope it will be finished in this month.
Anyway if you have any questions we will be happy to help you.