cheapvps
19.06.2021 13:30:28
The plate is about 3 or 4 inches above the bottom of the hull. I have a new prop that I haven't tried yet but the old one did not cavitate (if that means break loose and spin without gripping)
See full version: What is porpoising
The plate is about 3 or 4 inches above the bottom of the hull. I have a new prop that I haven't tried yet but the old one did not cavitate (if that means break loose and spin without gripping)
Thanks for the response. I know I can get temporary relief by trimming the motor down but I still get it at what I consider normal trim. Just put on a lower pitch prop but haven't had a chance to use it yet. Maybe that will solve my problem. I thought that the motor might be mounted too high and was considering lowering it a hole or two. here
They had showed this on one of them bass fishing programs the other day and demostrated it. They showed it on calm water. power tilt should be all the way down when starting out and graudually tilt motor up and if she starts to porpoise trim the boat down to where she stops the porpoising. They didn't mention anything about the prop.The boat that they used was one of them over poweredddd bass boats. <br /><br /> Happy boating. [links]
Hillfisher, where is the anti-ventilation plate in relation to the bottom of the hull? Is it level or 1 or 2 inches above the hull when trimmed all the way in? Don't lower the motor until you get a good reference point. Does prop cavitate?
Most porpoising is caused by the engine being trimmed too far out or the boat being stern-heavy.<br /><br />Good luck. more
You can buy a hydrofoil stabalizer at a boat store for about 40bucks and it will work wonders!<br />I installed one on my boat and it never porpoised again and it gets up on plane alot faster and it also helps handling a ton!<br />Zac [links]
Trim tabs � Adding trim tabs (or more extreme whale fins) will also improve a porpoising problem, but these will also affect overall performance of the hull. Adding transom wedges can often help too, since they will allow for more negative trim travel, if it's required. [links]
Porpoising can become more than just an annoyance in the high speed range, and can lead to loss of control, passenger risk, payload damage and structural hull damage when the motions become so severe that the hull is repeatedly overstressed. It can also result in �diving� or �stuffing� (tripping over the bow) when the low trim angles that occur in the �bow-down� part of the porpoising cycle cause the boat�s nose to dig in. So, a way of determining a boat�s susceptibility to porpoising is helpful to the performance boat designer.
So, even though a "higher deadrise" vee hull should have LESS tendency to porpoise than a low-deadrise bottom - since the high deadrise needs to operate at higher trim angles this makes it MORE susceptible to porpoise. So it's just not a simple rule-of-thumb to design for avoidance of porpoising!
Why does a boat porpoise?
Any Vee hull or tunnel hull can be susceptible to porpoising depending on design and setup, but some hull designs are more prone to porpoising than others. For example:
There are two factors that influence if/when a boat will porpoise.
The good thing is that we can calculate if a design is prone to porpoising, and we can analyze performance to predict the velocity at which we are likely to see the onset of porpoising. [links]
The next time you choose a hull design, you should also keep a few things in mind. more
Sometimes, the design of the boat itself causes it to porpoise. more
Lowering it may put that center a little bit deeper, lifting the hull and helping to avoid porpoising. here
Hydrofoils and jack plates will ensure that your boat never porpoises, but this approach towards the problem can be quite expensive.
If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. more
If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. more
Another way to prevent getting this page in the future is to use Privacy Pass. You may need to download version 2.0 now from the Chrome Web Store. here
Completing the CAPTCHA proves you are a human and gives you temporary access to the web property.