Information: Propeller types/design

[danie]

A short while ago I bumped into a posting (dont know how it started) that predictably moved to the old prop question regarding how many blades and what pitch etc.<br />In a reply in the thread a very interesting and helpful link was given by a member where one can get all the required information with pictures about the design, characteristics, use etc of the different types of props and I think the first page of the link started by stating "that the most efficient prop would be a one blader but because of the vibration ....." and then the link continued to compare etc.<br />Unfortunately I cannot remember the date of the posting but it cant be very old and I used search and tried my best paging through a few hundred pages but I cannot find the relevant topic. <br />Is there anybody out there that can point me in the right direction please?<br />Thanks a lot.<br />D

 

[AMD Rules]

Re: Information: Propeller types/design

There's always the Mercury guide online, if that helps:<br />Everything You Need to Know About Propellers

 

[danie]

Re: Information: Propeller types/design

THANK YOU AMD!!<br />Exactly what I was looking for.<br />Have a six pack on me.<br />D

 

[danie]

Re: Information: Propeller types/design

heybaylor<br />As promised, have a look at the site in question, go to Chapter 4 Propeller Technology, go to the section Number of Blades and check out the two paragraphs.<br />My pleasure.<br />D

 

[heybaylor]

Re: Information: Propeller types/design

Damdan , ok I read it ..<br />it says that a one blade is the most efficient..<br />also that more is less vibrating ..<br />so whats the point ..<br />nothing is said about drag..( my point)<br />a four blader still has to be of lessor pitch to achieve the same rpm as a 3 .<br /><br />I dont think I missed anything <br />I respectfully stand by my statements

 

[walleyehed]

Re: Information: Propeller types/design

The more blades on the prop, the higher the engine mounting height...<br />You gain RPM from less lower unit drag and more surfacing of the blades, but also, with more blades, you have more in the water.<br />There is a bit more drag with a 4-blade if the engine is left at the same height, but that's not how we set up a 4-blade, so it doesn't matter.<br />Either wheel, 3, 4, 5-blade if stamped 17 pitch is 17 pitch.....one revolution (theory), 17 inches fwd motion.<br />How the prop is used is more important than what prop is used.

 

[danie]

Re: Information: Propeller types/design

Correct, walleyehed. For my set-up, more blades, motor up one hole, less vibration, better holeshot, revs perfect, better overall performance, just right. Thanks to input from members of this forum.<br />D