nope, the way i have figured is, lower pitch and lower diameter propellers are less strain on the powerhead, but with more propeller and the lower pitch it creates a sharper more velocity pull then the higher pitch propellers, the higher pitch uses alot of strength to pull the water because it has more surface area. when your moving water within alot of lower pitch the water behind the first propeller is already in motion, the other propellers are only to increase the speed of the water. Today steve is comming over with a real tunze, i am gonna to see the flow the real tunze is gonna put out, and also finish up his sump.