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An Octura X438 or X440 may work well. Both are 1.4x pitch, 38 and 40 mm diameter respectively.
Things to note about these Octura props are:
(1) they both have a 3/16 inch bore so you will need to find some suitable K&S brass or aluminum tubing (JH, NTC or Rotor) to fatten up the Nimbus' 4mm prop shaft to make them fit;
(2) the props are cast in beryllium copper and will need to be sharpened and balanced before use (sharpen the props in a tub of water because the beryllium copper dust is very very bad for the lungs );
(3) they are very hard to find in SG - most bros import them from online vendors (e.g. Offshore Electrics, etc.) and costs around S$20+ a piece shipped (you can put up a post to see if other boaters have one to sell ).
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