Homebuilt ROVs Forum

plz I want to know how to calculate the thrust of motor theoretically , what specification the motor should have to give me the thrust i want , the relation between the propeller and the motor
i want to know the theories or rules that tell me the answers of these questions ?!

thanks for reply, but i want to know if there a rule to calculate the force of the motor using these variables, and when the prop will be aggressive ?? , and what factors should i consider in designing the nozzel ?!
thanks a lot

I am askin if I can calculate the rov thrust from the motor specifications befor the practical test or not ??! and how the nozzel should be ?