Yea,I see more than not ,boat problems ride attitude center of gravity ,engines going backwards. These things have been around for years. When I first started boat building Years ago, We only had books to read. BASICS OF RADIO CONTROL BOAT MODELING - ADVANCED R/C BOAT BOAT MODELING, JOHN FINCH , BASICS OF MODEL MARINE ENGINES, ALAN HOBBS these were your bible. Dark ages before the internet. Buy a book it's not all on the net.Sorry go to the library its free . but having one of your own you can always go back & read. cavitation prop walk ride attitude.angle of attack all this stuff & more.[the HOLIDAYS] sorry that term is in my other forum,on stuffing tubes for newbies I can't forget HARRY HIGLEY & THERE ARE NO SECRET