Thrusters by blue robotics are stainless steel, I have not received these yet, I will check when I get the package, I ordered 6 of U2 model.
Let me save some money, I found this company since I was looking for more thrusters for my sump and saltwater mixing station, customer service is second to none, I send email asking question and I got reply back from them in 1 hr, below is the link, they sell all sizes thrusters and U2 model is similar to T200 but 1/2 the cost they also sell the basic east you want the one that can make thruster go forward and reverse. I will share the sketch with you for Arduino Uno and you can modify based on your requirements.
APISQUEEN U2 MINI 1.3Kg Underwater Thruster 16V 130W
Voltage: 12-16V (3-4S LiPo)；Max. current: 8A；Maximum power: 130W；Size: 95.8*77mm；Weight: 210g；Wire diameter: 7mm；PWM:1-2ms，50HZ；Features:●U2 mini brushless underwater thruster one piece open mold, using composite materials, anti-corrosion and anti-oxidation, can be used in seawater...www.underwaterthruster.com
here is their youtube channel - ton of flow -
don't buy the larger model, ton of flow and risky for tank walls, I bought t500 2 for my 800 gallon display and I use them at 10 or 15% max before they start pushing water out of the tank, they are hefty price as well, I could have bought 4 of t200 and still be happy,
www.underwaterthruster.com
www.copenhagensubsea.com
9.2kg is lot of thrust, be mind full of thisAPISQUEEN one U92 Set Underwater Thruster with Waterproof remote control For Kayaks, inflatable boats, paddle boards, etc.
Voltage: 12/24V;Maximum current: 45A;Thrust: 9.2Kg;Output power: 1280W;ESC :100A (waterproof);U92 Operating environment: seawater/freshwater;Thruster material: composite material, one-piece molding.Notice:U92 150KV support voltage: 12-24V .U92 300KV support voltage: 12-16V .Set includes: U92...
I've been trying to figure out an equation to covert the kg to gph but have not as of yet. I assume the controller talked about earlier from the original poster will be able to lower the output to a safe level. I will be using a pulse mode once my brother can work his magic. Probably 2-5seconds on 10 seconds off. If all works out I'm going to have them do this with a 2-5 second forward on 10 off 2-5 second reverse, 10 off cycle. One on each end of the display. Otherwise I'll put 4 across the back wall. Have them do an on off or forward, reverse pulse and let the output break on the front glass causing random return flow through the rock and coral .
velocity=F/(density×A)
