Recent content by erlend

Hi Dr.D. Yes i think you are correct that this is a calculus problem. If i replace v with r x RPM x rad/s in the drag equation, i could maybe setup an differential equation? The total moment is what I am after, i need to know the torque for selecting an electric motor.

My current solution: I assume the average speed to be in the middle of the paddle wheel. That point is located at Ø135 or r=0.0675M v= r x RPM x rad/s v =0.0675m x 1500rpm x 0.10472 = 10.6 meter / second Drag equation using the speed: So the combined torque for both sides of the paddle wheel...

Hi anorlunda. Actually this is not a homework problem. I want to reduce the drag of something that is rotating in water and want to know the exact solution to it, i already have a rough estimate that would suffice for basic engineering. Just curious i quess :)

Hello, i have a problem that look's easy to solve but really is not. It involves a rotating paddle wheel submerged in water and i want to know the force exerted on the wheels and the torque required to rotate it. I have made a simple drawing to illustrate the problem below. I want to use the...