The Great Planes PowerFlow slow fly props are as good as or maybe even better than the APC SF props:
That seller will give you a lower combined shipping cost on multiple purchases if you ask for it.
You can see some test data that compares the APC and GP props in the database here:
The GP props will handle the same RPM as the APC props (they are much stronger than GWS SF props) and I think they work better. They also have a two sided hub, come with sizing adapters, and can be used as tractor or pusher props with no modifications.
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