Prop Question

[shagmebaby]

I have a Nordic 22 with a 355 , Quadrajet , Hei and RV style cam. The Boat presently Max's out at 52 Mph @ 5200 rpm. Can this boat make 60 Mph with the present set up ? and if so what prop should I be looking at ? :confused: the outdrive is a Volvo 280

[Tahiti350]

I have a Tahiti 18' with 350 Chevy/OMC 800. Motor is mostly stock, Edelbrock performer RPM, mild cam, O/T pipes on the factory risers. I GPS'd at 59.3 Sunday at 4400 RPM, and turned a second pass at 4600 later in the day without GPS, which would be 62.0 MPH. I currently run a 21+ s/s tri-blade prop, but want to try a 22+ or 23+.
Here is the link to the ADM Prop/Speed calculator: http://www.admboatworks.com/pitch.htm . If you have a know GPS run plug in everything but the slippage, get your slip rate, then play with RPM and prop pitch to get an idea where you need to be to get your 60 MPH.
I am hoping for 70 by next summer, if money is available.

[shagmebaby]

Thanks for the info..... what gear ratio are you running to get that speed. I have 1.61-1. and have to twist the crap out of it to get to 52

[shagmebaby]

and one more stupid question...... can you reduce slippage? mine figured at .19 that seems like alot :eek:

[Kevin Heine]

Hey Shag,
Contact Darrin at Houston Propellor. 281-580-7767 Thats all he does. H'e shipped props all over the U.S.. The man knows his stuff.