Slow plane at high altitude 5.0L MPI, please help

[Scott06]

I'm not sure what RPMs I'm at, the tach while I'm on water never says anything above 3000, but my ear tells me it's probably higher than that, though I could be wrong.

I purchased the RPM laser tool, I'll try to get an accurate reading to see how far off the tach is if any. I can't imagine this boat doing 45mph at 6300ft elevation and only being at 2800rpm (with the 4 blade 18p), but I suppose anything is possible? I doubt it though.....

No not that speed at 2800 rpm I think you just want to know the prop is such that you can get to the upper end of the wot rpm range for both of your altitude situations likely u will need different props for different situations


F lmk

 

[QBhoy]

I'm not sure what RPMs I'm at, the tach while I'm on water never says anything above 3000, but my ear tells me it's probably higher than that, though I could be wrong.

I purchased the RPM laser tool, I'll try to get an accurate reading to see how far off the tach is if any. I can't imagine this boat doing 45mph at 6300ft elevation and only being at 2800rpm (with the 4 blade 18p), but I suppose anything is possible? I doubt it though.....

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