New book ms on surface-piercing props and raceboat design

Discussion in 'Surface Drives' started by sandhammaren05, Jan 30, 2015.

  1. sandhammaren05
    Joined: May 2009
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    sandhammaren05 Senior Member

    Thanks Petter, I'll take a look at that web site. Where are you in Norway? I've spent a lot of time there, including on the west coast in rented nutshells with small outboards. Any Norwegian connection for me would be 1000 yrs. old via the Scottish Isles, but I feel very much at home in Norway and Sweden. Best, Joe


     
  2. sandhammaren05
    Joined: May 2009
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    Location: Texas & Austria

    sandhammaren05 Senior Member

  3. sandhammaren05
    Joined: May 2009
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    Location: Texas & Austria

    sandhammaren05 Senior Member


    The data on surface-piercing props by Hadler and Heckler are dead wrong when I apply them to SST45, SST60, and F1-type outboard racing. I'm pretty sure that I know what's missing there. Can any of you guide me to newer data on efficiencies, torque and thrust coefficients for surface props, please? Rolla Propeller, on their website, claims to have data from the Potsdam water basin that they use to calculate the above. I tried to arrange a visit with Rolla (made contact with Phil Rolla) but it's not possible before summer, at best.
     
  4. PetterM
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    PetterM Senior Member

    It not become a product for many reasons, but the technology had significant potential gave nice mix of high-speed efficiency and low speed manoeuvrability for the narrow market sector that needs this.

    Leif Magnus Endresen has retired by the time I joined Servogear but he still came around about once a week to discuss technical issues and get updated on projects. He is around 85 now but still sharp as knife, passionate and interesting to talk to. I am still in contact with him.
     
  5. PetterM
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    PetterM Senior Member

    From memory Brødrene Aa made a SES with an Escher-Wyss prop, but this was before my time.
    Would be very interested in seeing the open-water curves if these are shareable.
     
  6. BMcF
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    BMcF Senior Member

    Good to hear. He is indeed a very sharp fellow, as I recall. I'm sure he will recall the "Sea Lord" cats; I believe they were some of the first built with that propulsion/steering package.
     
  7. PetterM
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    PetterM Senior Member

    Hi Joe,

    Its all in the mindset.
    I am island of Stord at the moment on the west cost;)

    Petter
     
  8. PetterM
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    PetterM Senior Member

    There was a recent series Sea Lord being built, this time also by Båtservice in Mandal, but this time in carbon fibre sandwich:
    http://www.batservicemandal.no/vessels/item/35-m-carbon-catamaran-sollifjell
     
  9. BMcF
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    BMcF Senior Member

    Familiar with those...very. They had a rather bumpy beginning...;)
     
  10. PetterM
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    PetterM Senior Member

    Hehe, that’s quite an understatement ;)
    Think they work well now though.
     

  11. Roflhat
    Joined: Sep 2015
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    Roflhat Thundercat - 70.10mph

    Hi Joe,

    I spoke to you via email,
    I will take a copy as soon as it's available.

    Thanks,
    Seumas
     
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