So I got out today to do some more testing. I had 5 props to test, 2 pipes, strut settings, and a few other things. Started out OK but got run off by duck hunters. Moved locations and had the boat cut off way out and had to wait for a boat to bring it in (long story, normally have a jet ski or kayak..)

Here are the results thus far with 1" pipe and strut at 7mm:

X-472-47 mph, 16,320 rpm

X-572-37 mph, 15480 (may have been binding)

X-670-43 mph, rpm???

P-275-46 mph, rpm? (no tach, last weekend, strut 5mm)

Went to a 2" and lost 2000 rpm with all of them

Seems like it wont pull anything other than the 472. With it, the boat was violent, hard to drive, and floating on air. All the others it was lazy, and would not get on the pipe.

Do I need more prop out of the water for the 72mm 2 blades that I am running?