Posts: 726
Location: Eau Claire, WI | Thanks to all of you and I agree VMS Steve....too many variables! I was trying to simplify the question but I think I complicated matters by naming particular models. Turns out though that was a good thing because I had not considered the effect of diameter. Really all I wanted to know is again all things equal reducing the number of prop blades will do what to the rpms? I figured they would go up and looks like that has been confirmed.
I am trying to educate myself on props and it's really interesting. Seems there is as much voodoo as science.
My recently purchased rig currently has a 17P high 5 on a 150 opti and I'm getting 38 gps @ 5500 rpm w/ two guys and full fuel tanks. I think I can go faster than that so my thought was trying a 21P or 19P Tempest. The high 5 is great for holeshot but not great for high end. I don't have to go screaming fast but a 692 should go faster than 38. I was hoping to get close to 50 but just my guess. Other 690 series owners have told me they get 50 to low 50s with their 175s.
I appreciate all the help,
Jon
Jono
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