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  1. #1
    Join Date
    Sep 2015
    Posts
    196

    Default Upgrading to a stainless steel Propeller/ Query re millimetrical inclement on OB

    Currently using an aluminium prop 3 x 14 x 19. No issues. Wish to upgrade to a stainless steel one would it have to have same measurements or? If not what dimensions do you recommend?
    Also i noticed that outboard was rigged with a few millimeters ( 5/7) of inclement to port side. While smoking a fag and having a cup of tea at garage noticed that OB is very slightly inclined to one side. As boat is jacked i imagined that is the reason,but while examining it carefully and took the measurements i noticed that there is a very slight inclement to one side. As stated not more than 7 mm. Would this issue is a reason for concern? As i bought this new OB from a certified dealer what should i do? Holes on new boat were also done by the man that rigged the OB. What are your Views?
    Appreciate your kind help.

  2. #2
    Join Date
    Dec 2001
    Location
    north ayrshire
    Posts
    494

    Default Re: Upgrading to a stainless steel Propeller/ Query re millimetrical inclement on OB

    Its more common to move the engine to the starboard side to counteract prop torque.
    Usual theory when changing fron ally to stainless prop is to go down one pitch as the more efficient stainless prop is likely to reduce rpm. That said you need to know what rpm your doing at wot & your engines rated max rpm to decide

  3. #3
    Join Date
    Sep 2016
    Location
    SoF
    Posts
    10,209

    Default Re: Upgrading to a stainless steel Propeller/ Query re millimetrical inclement on OB

    Once you switch to stainless donít ground your prop. Itís not as forgiving as alu and can send the shock into the crankcase
    Neither a Leaver or Remainer be

  4. #4
    Join Date
    Sep 2015
    Posts
    196

    Default Re: Upgrading to a stainless steel Propeller/ Query re millimetrical inclement on OB

    Quote Originally Posted by Beamishken View Post
    Its more common to move the engine to the starboard side to counteract prop torque.
    Usual theory when changing fron ally to stainless prop is to go down one pitch as the more efficient stainless prop is likely to reduce rpm. That said you need to know what rpm your doing at wot & your engines rated max rpm to decide
    5800/5900 RPM at WOT. Manufacturers rated RPM Range is 5000 - 6000 RPM.

  5. #5
    Join Date
    Mar 2016
    Posts
    1,053

    Default Re: Upgrading to a stainless steel Propeller/ Query re millimetrical inclement on OB

    With you being at the top of the range already. Iíd stick to the same pitch.
    Itís a black art as youíll know but often some fast boats can gain rpm going to stainless from ally. Reason being that some of the best of them like the enertia and trophy...laser 2 etc can create so mich more lift on the hull...allowing higher rpm with speed to go.
    Be careful though. Some props just suit some boats and some donít. Is it 3 blade to 3 blade you are going ?

  6. #6
    Join Date
    Mar 2016
    Posts
    1,053

    Default Re: Upgrading to a stainless steel Propeller/ Query re millimetrical inclement on OB

    These days the old issue with hitting the ground and damaging gearbox and shafts etc...isnít an issue. Most props these days have sacrificial rubber hubs in them. Only hard splined props from days gone by would have you at risk of damage. Usually at least.

  7. #7
    Join Date
    Dec 2001
    Location
    north ayrshire
    Posts
    494

    Default Re: Upgrading to a stainless steel Propeller/ Query re millimetrical inclement on OB

    Quote Originally Posted by Karnic View Post
    5800/5900 RPM at WOT. Manufacturers rated RPM Range is 5000 - 6000 RPM.
    With those rpm figures I'd stick with the same size stainless your at the upper end of the range which is where you want to be but even switching to stainless is unlikely to drop you out of the recommended range

  8. #8
    Join Date
    Mar 2002
    Posts
    17,757

    Default Re: Upgrading to a stainless steel Propeller/ Query re millimetrical inclement on OB

    Quote Originally Posted by Karnic View Post
    5800/5900 RPM at WOT. Manufacturers rated RPM Range is 5000 - 6000 RPM.
    So, why change the prop?
    Sounds like you are trying to solve a problem that doesn't exist, imho.

  9. #9
    Join Date
    Sep 2015
    Posts
    196

    Default Re: Upgrading to a stainless steel Propeller/ Query re millimetrical inclement on OB

    Quote Originally Posted by QBhoy View Post
    With you being at the top of the range already. I’d stick to the same pitch.
    It’s a black art as you’ll know but often some fast boats can gain rpm going to stainless from ally. Reason being that some of the best of them like the enertia and trophy...laser 2 etc can create so mich more lift on the hull...allowing higher rpm with speed to go.
    Be careful though. Some props just suit some boats and some don’t. Is it 3 blade to 3 blade you are going ?
    Yes 3 blade

  10. #10
    Join Date
    Dec 2001
    Location
    north ayrshire
    Posts
    494

    Default Re: Upgrading to a stainless steel Propeller/ Query re millimetrical inclement on OB

    Quote Originally Posted by MapisM View Post
    So, why change the prop?
    Sounds like you are trying to solve a problem that doesn't exist, imho.
    Generaly you will see a performance improvement from ally to stainless either via higher top speed or improved economy.
    Everytime I've switched from ally to stainless I've seen a performance gain

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