understanding prop pitch....the fastest you could go with a 24 pitch prop, a 1.50 gear @ 5000 rpms is 76 mph...so when a guy says his boat does 80, my eyebows raise...
that would be at zero slip!!!and would be at 5280 rpms... most merc motors max right around there.. now throw in 15% slip @ 5280 rpms... the speed drops to 68 mph..so to go 80 mph the motor would be spinning 6212 rpms.... not in a stock merc power!...aint gonna happen

I have never GPS'd my hallett... and have no idea what the slip is... it has a 2 step bottom, so it has to be better than a straight bottom? right or wrong???

it feels like it's hauling ass... but I don't have facts.. so won't say how fast it goes

there are 5 things to know about prop speed..you have to know 4 out of the 5 to calculate,.. the 5..gear, pitch, rpm,slip= actual speed..for most... who cares right..
but for gear heads... the I gotta know!

you can do it with three to get a guess number, just plug in a slip number... then go out with a gps and find out the real slip number,..

it has been said, to find out how fast the boat goes, keep trimming up till you loose speed,... or crash.....so be careful if you try this method