need prop help please!

[fowlmouth]

OK, my boat came with a 14x19 prop and was turning 5800 rpm's running 39-41 mph (gps) my local boat shop was good enough to loan me a prop to try which was 12 3/4x21 the boat now runs 5100 rpms at 51-53 mph(gps) at speed the boat seems "loose" I didn't lose a lot on the holeshot, but does anyone know if I order a 14" prop should my handle better? and would that also increase my holeshot due to more surface area/less cavitation?

[Revtro]

It probably has more to do with the pitch from what you're describing.  You went from a 19 to a 21, which is a good jump.  If the motor is rated for a 14 inch prop, you should stick with that and try a 20 or 21 pitch to see if you get more control at high speeds.  Some specs about the boat and motor would help.  Some manufacturers have forums where you ask this stuff also.  I got some great advice about my prop situation from the basscat forums for example.  Hope that helps.

[fowlmouth]

thanks revtro, It's a javelin 17 venom with a 90 johnson

[bshaner]

what's the "holeshot"  (new boat owner remember). 

[fowlmouth]

holeshot is the acceleration from standstill to plane(how fast the boat pops out of the water)

[gnewski5]

Just a heads up, Pay attension to the "cupping". I was also running a 14x19 prop at WOT 5600 RPM'S, but it was cupped. I found a "hazard" out on Erie and ripped the tip off a blade. So, while my original was getting repaired I bought a 14 1/2 x 19 figuring I was running right at my max RPM's. Come to find out, this new prop was not cupped. WOT was running 6300 RPM's. I ended up having it double cupped and pitched to a 21 to get it back down to 5600 RPM's.