Porpoising problem

This sounds like a situation for Ricky the “Prop” man in Brainerd MN. Give the guy a call. He has done wonders with advise and the correct props. IMHO

Joel VK is spot on. I have my trim up as high as I can at 3/4-wot and walk that thin line of keeping as much of that hull out of the water as possible. My thumb is constantly on the tilt and trim switch and am constantly tweaking it up or down a little to hit that sweet spot at higher rpm’s. Never had the problem of porpoising slowing down, that’s interesting. Suppose people get in the habit of trimming it back down and they are not 100% aware they are even doing it. I’m curious if I’m doing it now? Each boat is so different with how the motors height and how much different the trim level effects it. Weight distribution, unless there’s something really off, shouldn’t affect a bigger boat like that that much imo.

It’s amazing just a different pitched prop would help with that. But prop’s will change all kinds of things. I worked with Formula Prop and they helped a ton with getting the right pitched prop for my rig. Got the right balance of hole shot, enough control to not have a sloppy, sliding rear end and great top end at the higher rpm’s.

Really curious if just trimming it down coasting into a stop curbs the porpoising issue?

I think it’s safe to assume that the best hole shot = trimmed all the way down and the max performance at WOT = trimmed all the way up. The sweet spot in between will fluctuate due to speed, weather conditions, and waves.

It doesn’t do any harm to “over trim” on the safe side. The second I back off the throttle I immediately begin trimming down. Too much down trim isn’t going to hurt unless it’s for long periods of time. Even then it’s only a matter of gas mileage. You can also trim down before backing off the throttle. It will naturally slow the boat down

I think I am more that surprised aluminum boat guys aren’t having this same issue…

Joel VandeKrol wrote:

I think it’s safe to assume that the best hole shot = trimmed all the way down and the max performance at WOT = trimmed all the way up. The sweet spot in between will fluctuate due to speed, weather conditions, and waves.

It doesn’t do any harm to “over trim” on the safe side. The second I back off the throttle I immediately begin trimming down. Too much down trim isn’t going to hurt unless it’s for long periods of time. Even then it’s only a matter of gas mileage. You can also trim down before backing off the throttle. It will naturally slow the boat down

I think I am more that surprised aluminum boat guys aren’t having this same issue…

10-4
I will give this a try next time on the water
Thx Joel

I have an 02 ranger 619 200 options with kicker, 5 batteries tempest 21 and have porpoising issues as well. Here’s what I found. A couple years ago I was doing a big clean had all gear out of the boat no kicker on and my 3 trolling motor batteries pulled out. The boat did not porpoise with all that gear pulled out at any speed. Add weight back in and she’ll porpoise till she hits 40 mph.

I was able to test a rev 4 19 pitch and a bravo 21 pitch. Both greatly reduced and nearly eliminated all porpoising at all speeds!

Difference was the rev 4 lost about 1.5 mph but rode better in big waves. The bravo 4 blade actually picked up about 2 mph but handled the rough stuff not nearly as well as the rev.

I still got my tempest and want to raise my motor one hole before I buy a prop, but will probably end up with the rev 4. I ride in rough water more than I need that extra speed.

Smart tabs will solve all of the porpoising problems at any speed. And they are not that expensive.

19 pitch tempest on my 2025 prov no porpoising problems. Great hole shot, only 54mph top end but I am not a speed demon and even a ranger can’t do 54mph in 3 footers

Mocha wrote:

This sounds like a situation for Ricky the “Prop” man in Brainerd MN. Give the guy a call. He has done wonders with advise and the correct props. IMHO

X2

Really set me up with an incredible prop.

http://www.in-depthoutdoors.com/community/forums/topic/1675-impact-prop-selection/

Well I got back out on the water this past weekend and took some of your guys advise about tweaking the trim down first before backing off the throttle and that really helped. I also found that before when I was shooting up out of the hole I would be trimming up too quickly. Now when I trim up at a slower rate it is much better as well.
Some operator error to blame only myself for but the prop suggestions may be my next step in getting fine tuned.

Thanks for all of your responses and suggestions.