225 SHO having trouble holding speed in curves.

[The Arch]

The motor is on a 400t javelin 225 SHO 25 pitch t-2 Yamaha prop . I run a lot of rivers and I'm entering the curve doing 72-73 mph at 6000 rpms but speed will drop to 57 mph . I've been toying with the idea of buying 24 pitch to try. I must add I'm running a 5 inch cmc hyd plate. If I raise the motor u high she doesn't drop down but to 62-63 mph . Im just concerned to push it in the curves and that height . Any suggestions thanx

[Oldone]

OK I'm not a prop guy but I'll give this a shot. When you are trimmed for maximum speed and you turn, the angles change and create more slip. RPMs usually increase with a decrease in speed. Typically you counter this by trimming down but you have to find the medium you are comfortable with. I'm sure that you can find a prop that will hold speeds in turns better but they will decrease your WOT speed. It should also be noted that turning at high speeds can create handling issues such as hook. Other than that the only other issue is water pressure. I'm assuming we are talking about a V hull boat. If it's a STV, VT, VP, type hull you better be trimming down on turns or you are going to get out.

[John Jackson]

Nothing keeps straight line speeds in a curve. It takes more HP with the added resistance. The harder you turn, the more speed you lose. That is normal.

Adding to that, even if you kept the same surface speed, not running in a straight line would reduce GPS speed calculations.

[Snoopy Rod]

sounds like you need to try a few different props.

[BroWhoop]

Most boats running 70 are on the pad, your turning on ability on the pad is virtually none. The minute the boat drops off the pad you have more hull in the creating more friction plus while turning the strakes are dragging as well. I don't know of a way to maintain speed on a pad hull while turning. Just my experience.