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There are lots of options besides OEM, almost all of which are significantly cheaper, too. On my 15/F70, I use a PowerTech SCD-3 in 16 pitch, with excellent results. You'd probably want to go down an inch or two in pitch for your Katama, but the good news is that if you get a PowerTech, you can trade in for a different pitch prop of the same model for a relatively small fee. It sometimes takes a bit of trial and error to get the pitch right but I am confident you'll be happy with the performance of the SCD-3.

I got mine from Dan's Discount Props - have dealt with them many times over the years. The SCD-3 is not shown on Dan's website, but if you call them they are happy to order any of the PowerTechs and what they order gets drop-shipped to you - special order does not create any additional delay. Mine arrived in 3 or 4 days from the time of order.

Tim