Click for Horizon Click for Bering Click for Dockwise Click for Trinity Click for Nordhavn

Carbon Props?

Discussion in 'Technical Discussion' started by sabrejocky, Feb 8, 2006.

  1. sabrejocky

    sabrejocky New Member

    Joined:
    Feb 18, 2005
    Messages:
    4
    Location:
    Vero Beach, Florida
    Does anyone have experience with carbon-fiber props? are they more efficient? are they more durable, cheaper in the long run?

    Cor
  2. YachtForums

    YachtForums Publisher/Admin

    Joined:
    Dec 22, 2002
    Messages:
    17,858
    Location:
    South Florida
    Take a look at Volante's page. Good info here. It's not hype. A number of yacht builder's have adapted. Many years ago, I conducted extensive research into reflex impeller and stator blades for the Navy. The benefits are numerous...

    http://www.compositecarbonfiberprop.com/

    Beyond the obvious, i.e., replaceable blades, reduced weight, reduced vibration, anti-fouling properties... if the right prop is chosen for load and RPM (and it is properly designed) it will offer performance and efficiency gains. This is a by-product of blade flex, not reduced cross section or less weight.

    There are *true* carbon fiber props. I can't comment on the impact resistance of these props. No experience with 'em.

    Then, there are nylon re-inforced graphite composites that generally offer good impact resistance and increased blade flex. Again, if the right blade thickness, shape, sectioning and durometer are chosen, these props have merit. Their application isn't for every craft. They may be well-suited for yachts, based on the speed and RPM's used in this environment, but they're not the right choice for hi-speed, surfacing apps.
  3. nas130

    nas130 New Member

    Joined:
    Apr 15, 2005
    Messages:
    89
    Location:
    florida
    Any captains/owners running these props?

    I am curious about real world experience with them, as we are reproping the boat.

    nas
  4. K1W1

    K1W1 Senior Member

    Joined:
    Sep 30, 2005
    Messages:
    6,453
    Location:
    My Office
  5. mr_sunseeker

    mr_sunseeker New Member

    Joined:
    Jan 17, 2006
    Messages:
    49
    Location:
    UK & Med
    Hi I would like to see if anyone has now had experience with carbon props and their remarks?

    Also why are they not suitable for high performance surface use?

    Thanks!
  6. nas130

    nas130 New Member

    Joined:
    Apr 15, 2005
    Messages:
    89
    Location:
    florida
    I do not know for certain why carbon fiber props cannot be used in surface drives. When surface drives were in their infancy the loading and unloading of the propeller blades caused them to frequently crack. They combated this by using a straight leading edge that is a bit thicker than conventional propellers. I would figure that because carbon fiber blades are even stiffer this repeated stress would cause them to crack as well.

    I nixed the carbon fiber propellers for the last boat I ran based on cost and lack of data. For the price of carbon propellers I could by two sets of conventional props.

    One other thing to consider if you hit bottom and break off all the blades on carbon fiber propellers you will lose propulsion. On conventional propellers it should be harder to completely destroy all of the blades and you will be able to limp home.

    nas
  7. C4ENG

    C4ENG Senior Member

    Joined:
    May 19, 2006
    Messages:
    568
    Location:
    Ft Lauderdale
    I was in a conversation not to long ago with a captain who was telling me that he was running a 120ft boat with carb props. He said it felt like the pitch would staighten out under load or that the pitch was wrong all together. Basically he thought his experience with the props was not very good.
  8. ERTW

    ERTW Member

    Joined:
    Nov 19, 2006
    Messages:
    41
    Location:
    North America
    I thought I read somewhere that de-lamination occured on C.F props in highspeed applications from cavitiation...didn't the guys on Earth Racer have this problem and had to replace a prop? Does anyone make them out of S-glass instead?
  9. brian eiland

    brian eiland Senior Member

    Joined:
    Jul 28, 2004
    Messages:
    2,392
    Location:
    Washington DC, Annapolis MD, Thailand
    Been a long time since this subject was first brought up,....and then it seems to have died off rather quickly??

    Any new experiences over these last few years??

    I was just looking here:
    Contur® Carbon Fiber Propeller Technology
  10. brian eiland

    brian eiland Senior Member

    Joined:
    Jul 28, 2004
    Messages:
    2,392
    Location:
    Washington DC, Annapolis MD, Thailand
  11. Capt J

    Capt J Senior Member

    Joined:
    Jul 11, 2005
    Messages:
    6,302
    Location:
    Fort Lauderdale
    I've heard that they flex and lose pitch under high load/rpm situations
  12. Nicholasde

    Nicholasde New Member

    Joined:
    Mar 16, 2012
    Messages:
    1
    Location:
    San Rafael, CA
    This all very fascinating! great use of materials, Carbon Fiber props better used on smaller crafts?
  13. Laurence

    Laurence Senior Member

    Joined:
    Aug 30, 2006
    Messages:
    250
    Location:
    Chattanooga TN
    Prop materials

    Performance Propellers (don't know if they still exist) made sailboat props out of urethane with claims of improved performance under all conditions.
  14. Marmot

    Marmot Senior Member

    Joined:
    May 20, 2007
    Messages:
    3,027
    Location:
    9114 S. Central Ave
    The other side of that scenario is if the carbon props are the type with replaceable blades it is simple and quick to remove the stubs, install new blades in the water at the scene of the embarrassment and continue on with the voyage. No limping required.

Share This Page