Hallo Lee, attached is the Raboesch prop catalogue for reference. There are several 4 blade series with differing blade shapes. Most are available from various UK sources, including Cornwall Model Boats. Cheers Doug 😎
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Young at heart - slightly older in other places 😉 cheers Doug Grant me the Serenity to accept things I can't change, the Courage to change things that I can, and the Wisdom to know the difference!