Propellors stolen can you drive boat with one prop (duo prop b4)

You seem adamant that they were stolen but I suspect they have simply fallen of in the water. If someone is going to steal some props they will almost certainly take the complete set. The rear props have a habit of falling off, I have seen quite a few cases myself over the years.

Cough.
There's an A6 four bladed prop, with cone, on the seabed just off Nieuwpoort if anyone fancies a swim.
 
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