grapescan
21.04.2021 4:36:25
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It's all about function<br /><br />Fishing boat<br /><br />Cruise speed<br /><br />Minimal, ventilation in all types of seas<br /><br />Thanks for the reply's<br /><br />Let you know
Re: 3 blade prop, changing to 4 blade, change pitch? [links]
Since you are sticking with the same brand you should be able to stick with the same pitch IF your at the correct top RPM's now. You may find you can play with the X dimension to get even better performance. Keep in mind that 3 and 4 blade props seldom run best at the same height.<br /><br />Good luck!
Roy,<br /><br />If you feel happy with Solas, going for a 4 blade will improve grip.<br /><br />I had severe problems of the same nature and fixed it all with a 5-blade Quicksilver HighFive.<br /><br />Here's the theory:<br />Regarding pitch you'll lower your rpm by approx. 200 for each inch in higher pitch. As your existing prop vnetilates you have to detect if some of your WOT rpm is a result of that.<br /><br />If not, the same pitch will result in the same rpm and you'll notice the difference only when accellerating + cornering + trim.<br /><br />A testdrive is the only way to tell how it actually behaves with a certain setup.<br /><br />Booklet 'Everything you need to know about propellers' is available for (free) download here http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=17;t=014920 and will tell you al lot about props, hulls, theory, practise.
Re: 3 blade prop, changing to 4 blade, change pitch?
All experience from others must be taken with a grain of salt. <br />Your actual setup is special and some experiments nedd be done.<br /><br />If your problem is, that a 3-blade at ant time has too little blade area in the water, a 4 or 5-blade ofcourse will improve.<br /><br />If your pitch is correct (the prop is not slipping heavily at WOT and you're within rated rpm range), best guess is that the same pitch with more blades will end at same rpm.<br /><br />The drag theoretically would change from more blades, but this is a minor issue and is better established by testing as more parametres are involved in your case. If you're buying the prop from a good dealer, he should help with lending a prop for testing.<br /><br />You also have to decide how you expect the prop to perform (traction/hole shot or topend priority). [links]
So here are my questions:
Will a 4 blade prop help me maintain Plane at a lower speed?
Should I go to a 19p prop since I am adding a blade or even lower?
Re: 3 blade to 4 blade pitch conversion [links]
Unless you know that one of the boats in your area is exactly like yours and carrying the same amount of goods, do not concern yourself with what they are using.
Recent advantages in outboard technology have made choosing the correct propeller for your boat both easier and more difficult. easier because the number of choices has doubled, and harder, for the same reason. Propeller manufacturers have been busy developing new 3-blade and 4-blade products and size ranges of stainless steel propellers to meet a growing number of hull types and horsepower ranges, especially for 4-stroke engines.
The purpose of this article is not to explain propeller theory or hydrodynamics, but rather to point out the various options in the market place and set some common rules of thumb. This article confines itself to the discussion of 3 and 4 blade props as these are the most common in the real world. [links]
What’s important to you. Top Speed, Cruising Speed, Hole Shot, Load Carrying, Slow-Speed Handling, Slow Trolling, Fast Trolling? Two identical boats with identical engines could be propped quite differently, depending on the usage, water conditions, and load. There is no such thing as the best or ideal prop for all applications of a similar nature. Acceleration may be compromised for top speed and fuel economy, and visa versa. Often times, there may be 6 or 8 different props that seem to run about the same, with differences so subtle that any of them could be considered satisfactory by most standards. This just makes it that much harder to make a decision and choose the right prop.