Pro Boat UL-19 Porpoising

[RMac]

I have a UL-19 running 6s (2 hardcase 3S Zeee batteries) stock prop but Sharpen and balanced, an OSE 150amp Raider ESC. Specktrum Firma 4074 2050Kv 4-Pole Brushless Motor. Setup runs cool in the 110º 120º temp range max. I also added lots of cooling. Problem is i?m getting a bow hop or porpoising at all speeds below WOT? Also i get a lot of cavitation or ventilation when turning below WOT. I have the batteries as far forward as possible or up to the front stops. What can i do to fix the porpoise issue. The only adjustment on the UL is to raise and Lower the prop height. I have lowered the prop which helped some. Would trim tabs fix the issue? Can you run trim tabs on a hydro? Anybody have issues like this on a hydro?

[1coopgt]

Video of it running would really help. Did you check your CG with the changes you made ?

[RMac]

I’ll try to get a video on next run. Im going to check the CG again today. For a hydroplane where is the best point to have the CG in relation to fore and aft and left and right of center? The prop on this boat rotates counter clockwise, is there a benefit to have the CG a littler left of center to compensate for torque? It does seem like the left side is coming up and down more then the right? But kinda hard to tell.

[1coopgt]

Hope this helps. I saved it from here.

[RMac]

Looks like the attached image or link didn?t go through

[1coopgt]

It's there.