They are made by Alex Prop alias Doctor Props
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Then yes, I have seen many of those props, doctor props is not new, but he is constantly releasing new props into his ranges. Like many of the CNC prop makers he has 2 main ranges, 1 is a rip off of the Octura X series (I have no experience of these). The other is a low blade area range for Naviga style endurance racing. These are pretty popular here as we race Naviga, and while I don't run them myself (too much invested in a large box of Octuras and ABCs, if I could swap those 47 BS and mostly thinned and detounged cast props for a dozen of Alex's factory BSP Naviga props, I would in a heartbeat), they have proven to be the most efficient metal props for our racing.
All the doctorprops I have seen are his factory BSP and he does a great job of it, because of the much harder material they come thinner and sharper than I can make an Octura without it rolling the edges in use. He does sell them with what looks like a sand blasted finish which I assume is to round off the CNC steps and make the finishing easier, but with the quality of finishing work he does I dont know anyone that has bought unfinished. There are no signs of CNC step marks, and while I am not one for prop pollishing they are prettiliy mirror polished. He says they are dynamically ballanced and while I dont have the facility to check that, they do ballance well on my modded magnetic ballancer.
Not everything is roses though, often there are long turnaround times to get ordered props. I am also not overly happy with all his buisness practicces, he used to advertise his Naviga props as 1.4 pitch, but recently has brought out a new line of higher pitch 1.4 pitch props and marked the old ones as the 1.15/1.2/1.25 that they actually always were, one of my friends bought a replacement 1.4 and his runtime died, he asked Alex and was told he advertised them as 1.4 as he thought nobody would buy 1.2s.Paul Upton-Taylor, Greased Weasel Racing.Comment
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