Fab1 Posted October 2, 2022 Share Posted October 2, 2022 Why aren’t impellers and the like made from Polyurethane I wonder?They would last alot longer I presume?Cost?Flexibility?Maybe a combo. I make all sorts of impellers ranging from small ones about the circumference of a cup and a few grams to ones that are about 3 meters round and weigh 2 or 3 tonne out of rubber and polly and different types of impellers among many other parts. Link to comment Share on other sites More sharing options...
noelm Posted October 2, 2022 Share Posted October 2, 2022 I think because they need to be very flexible, an outboard water pump is not spinning on centre, the vanes continually bend back and forth. Link to comment Share on other sites More sharing options...
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