I installed the 3 Blade Hartzell Schimitar on my 69 Six 300. It is great! Excellent in climbs and go arounds, no loss in TAS, quiet and smooth!. I routinely true out at 143 knts, 7-12K MSL, @65% power with 22/2400. There is a new 2 blade Schimitar out but I dont know the stats on that one. It may be cheaper.
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