Classic Warships S-100 Propeller Replacement Set
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The new Revell S Boat is a great kit, but is has one big weakness. The propellers included in the kit are inaccurate and misshapen. Refer to Guido Hopp's review to see the kit propellers. with a lot of work he was able to make them somewhat presentable but what is really needed is a replacement. The upgrade set includes three metal cast propellers. They are of the correct pitch and in a left and right hand version. 
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props included in Revell kit.
An instruction sheet is included to explain the counter rotating design. A stern view looking at the propellers will ensure that you get them on right. The outer propellers rotate in different directions to help counteract the torque created by the turning force.