Any prop experts out there?
Submitted by Happy Hooker on Wed, 2010-09-01 16:30
Have been offered a cheap spare prop to fit my 2004 Mercury 150 V6 EFI 2 stroke. Have been trying to find info on net but though would post up here. Prop is marked 48 78122 21P.
Any idea will this fit. Currently running a stainless steel vengence prop 48 16314 17P.
Rod P
Posts: 725
Date Joined: 20/05/08
I doubt it as the one you
I doubt it as the one you are running is a 17 pitch and the one you've been offered is a 21 pitch. Unless you really want to overload your outboard.
Rod
Tony Halliday
Posts: 2500
Date Joined: 14/06/07
HEY Rod,would that 21 inch
HEY Rod,
would that 21 inch fit my mercurier?
I have worked out a 21 or 19 inch pitch would be the best for me running the revs I do.
recommended prop for me is a 19 inch 3 blade 48-12700A46 Mirage plus.
Tony Halliday: ~Meals on Reels ~
It takes a strong fish to swim against the current. Even a dead one can float with it
"It is always in season for old men to learn." Aeschylus (525-456 BC)
"In a mad world only the mad are sane." Akira Kurosawa (1910-1998)
PilbaraBrad
Posts: 3628
Date Joined: 16/05/07
the number then p, ie 17P is
the number then p, ie 17P is 17 degres of pitch. Put simply the greater the angle of rake the greater the load and more torque required to drive.
more pitch = more load, much like a smaller chain ring on a push bike
dodgy
Posts: 4563
Date Joined: 01/02/10
Sure its 17 degrees Brad? My
Sure its 17 degrees Brad? My understanding was a 17p prop would push the boat forward 17in for each rotation. (not counting slip in any way)
Does anyone know where the love of god goes, when the waves turn the minutes to hours?
till
Posts: 9358
Date Joined: 21/02/08
Its p for pitch, ie; angle.
Its p for pitch, ie; angle.
dodgy
Posts: 4563
Date Joined: 01/02/10
Explained
Explained here.
http://www.propellerpages.com/?c=articles&f=2006-03-08_what_is_propeller_pitch
Does anyone know where the love of god goes, when the waves turn the minutes to hours?
till
Posts: 9358
Date Joined: 21/02/08
Well that is interesting. I
Well that is interesting. I always thought the idea of measuring that way a bit vague.
Tony Halliday
Posts: 2500
Date Joined: 14/06/07
http://www.mercurymarine.com/
http://www.mercurymarine.com/propellers/prop-selector
try this program it will help you select the righ prop and what can work on your rig.
Tony Halliday: ~Meals on Reels ~
It takes a strong fish to swim against the current. Even a dead one can float with it
"It is always in season for old men to learn." Aeschylus (525-456 BC)
"In a mad world only the mad are sane." Akira Kurosawa (1910-1998)
grayzeee
Posts: 2283
Date Joined: 09/07/09
17 inch pitch isn't it like
17 inch pitch isn't it
like a screw
If I spent half as long fishing , as I do reading this bloody forum , I'd be twice the fisherman I am.
PilbaraBrad
Posts: 3628
Date Joined: 16/05/07
I am only going on my navy
I am only going on my navy engineering days for my knowledge. Our ships props were variable pitch, ie. controllable. At 0 pitch we had 0 degres angle of rake on the screws which meant zero propulsion. As we put pitch on the props (increased the angle of rake) it put load on the shafts. hence my statement before, the more pitch you put on the more load. 23degres was our maximum setting from memory that was also the pitch required to reach our top speed and also put maximum load on the drives.