Twin-Propeller Open Water Efficiency

Discussion in 'Propulsion' started by EviLCuLT25, Apr 12, 2009.

  1. EviLCuLT25
    Joined: Apr 2009
    Posts: 1
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    Location: UK

    EviLCuLT25 New Member

    Hi everyone, this is my first post here.

    Anybody knows twin-propeller open water efficiencies, similar to Schottel STP series?

    I need this information and I emailed Schottel but no reply :(

    Help me pls.

    I assume it will have less efficiency from large slow speed propellers (0.6-0.7) because it revolves at 1800rpm and is only 1.3m diameter, but is was hoping it could still achieve high efficiency because of the second in-lin propellor.
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