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1FASTLASER Profile
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Registered: 02-2010
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Props and there differences


  I was sitting here and the ole brain started working ....LOL yeah it does that sometimes and I got to thinking you know there may be alot of people that dont know the difference between a chopper or a cleaver...or a High rake prop.....We oughta pool our wisdom together and put up a small desciption of several props and what they are capable of doing for the boat

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LASER'S n MERCS....SETTIN THE WATER ON FIRE
May/1/2010, 6:29 am Link to this post Email 1FASTLASER   PM 1FASTLASER
 
Jay Martin Profile
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Re: Props and there differences


Hummmmm! You want to take on a monster do ya??? Thats a broad subject. We can do it, will take some time.

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www.jaymartinpropellers.com
May/1/2010, 8:36 am Link to this post Email Jay Martin   PM Jay Martin
 
bonsaibp Profile
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Re: Props and there differences


Heck Jay we got all the time you need....cough cough...lol

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bonsaibp
I AM NOT SAYING THERE SHOULD BE CAPITAL PUNISHMENT FOR STUPIDITY,
BUT, WHY DON'T WE JUST TAKE THE SAFETY LABELS OFF OF EVERYTHING
AND LET THE PROBLEM SOLVE ITSELF?"
blkdog812
May/1/2010, 9:39 am Link to this post Email bonsaibp   PM bonsaibp
 
Jay Martin Profile
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Re: Props and there differences


OK... Heres a good start...

Number of Blades
Three-bladed is by far the most common propeller design for today’s boat engines. The three blade design offers good performance and efficiency with the best “cost vs. benefit ratio” for most boating applications. Four-blade propellers are used to enhance performance where increased engine heights are required, faster acceleration is needed or where the boat is being operated in rough water conditions. Additionally, four-bladed propellers can increase overall performance in applications where heavier boats and/or loads are typically being experienced. The four-bladed design can also enhance the ability to use more positive trim angle without “slip” and cause the boat to have increased bow and/or stern lift. However, four blades also mean increased drag on the engine, lower top speeds, and different handling characteristics. It’s beneficial to note that if a three blade propeller is operating within the proper WOT RPM specification, a four-bladed propeller must normally be one size pitch less in order to accurately maintain the correct WOT RPM.


Last edited by Jay Martin, May/1/2010, 11:52 am


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www.jaymartinpropellers.com
May/1/2010, 11:51 am Link to this post Email Jay Martin   PM Jay Martin
 
bonsaibp Profile
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Re: Props and there differences


What does "cup" mean and what does it do?

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bonsaibp
I AM NOT SAYING THERE SHOULD BE CAPITAL PUNISHMENT FOR STUPIDITY,
BUT, WHY DON'T WE JUST TAKE THE SAFETY LABELS OFF OF EVERYTHING
AND LET THE PROBLEM SOLVE ITSELF?"
blkdog812
May/4/2010, 10:03 pm Link to this post Email bonsaibp   PM bonsaibp
 
Jay Martin Profile
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Re: Props and there differences


Cup is the roll in the trailing edge of the blade and tip. Tip cup added will increase bow lift, cup across the trailng edge will increase stern lift. Cup also helps hold on to the water when the prop is surfaced. All this put together will put a big grin on your face at W.O.T..... emoticon ......

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www.jaymartinpropellers.com
May/4/2010, 10:13 pm Link to this post Email Jay Martin   PM Jay Martin
 
bonsaibp Profile
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Re: Props and there differences


I'm starting to like that grin emoticon

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bonsaibp
I AM NOT SAYING THERE SHOULD BE CAPITAL PUNISHMENT FOR STUPIDITY,
BUT, WHY DON'T WE JUST TAKE THE SAFETY LABELS OFF OF EVERYTHING
AND LET THE PROBLEM SOLVE ITSELF?"
blkdog812
May/4/2010, 10:41 pm Link to this post Email bonsaibp   PM bonsaibp
 
boater777777 Profile
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Registered: 05-2010
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Re: Props and there differences


ok well how about over hub vs over/though, vs though hub props.
May/23/2010, 7:52 pm Link to this post Email boater777777   PM boater777777
 
BARRY J Profile
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Re: Props and there differences


Think I can help out a little with this one. Not trying to say I know more than Jay. Over hub allows all the exhaust gasses to enter the blade area. This allows the prop to spin more freely to get the rpm up and plane off the boat. They are mostly used on light hulls with higher engine heights. The over/through hubs allow a little exhaust to enter the blade area and the rest to go through the barrel. The through hub models force all the exhaust through the barrel. The reason for the vent holes on props is to adjust the amount of exhaust gas allowed to go into the blade area.
May/23/2010, 8:14 pm Link to this post Email BARRY J   PM BARRY J
 
1FASTLASER Profile
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Re: Props and there differences


Hey Jay while we are talking bout props and differences I gots a question fer ya.....The millwright is coming out in me on this one......Barrel length....what does this do or not do in the prop game. For example I was pondering about chopping a prop up I have to see what it will do or not do. Its a stock SST2......you know the prop I am reffering to . Its the teflon coated ss prop that in the day was the stock ss prop you got when you bought a new OMC motor. It has on it what I have heard referred to as a diffuser ring. You know the portion of the barrel that flares out. I was thinking about cutting this off and see what happens. What do you think??????

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LASER'S n MERCS....SETTIN THE WATER ON FIRE
May/29/2010, 6:28 am Link to this post Email 1FASTLASER   PM 1FASTLASER
 


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