New Nitro Z21 To Be Unveiled At Classic

[Champ188]

I don't know what pitch I have on my z-9 but I only get about 70mph on a good day with it. I think I've heard that most z-9 are a little slower boat than others. Can anybody attest to this? Just wondering if I have the right prop on for performance.

Alex, Kelly Power could tell you everything you'd want to know about the Z9 --- setup, his personal experiences, etc. I believe he had one of the first ones off the production line and he knows his stuff about boats.

[huntest]

I have a Ranger 487vs with a 200 Mercury xri and 4 blade prop. We aren't very fast but we sure look good ?

[Ham]

A true gps 80 is a tall order for a bass boat. Only a few hulls get there on any sort of regular basis with a fishing load- and they are pretty much your gambler/Stroker/bullet/allison types. Bass Cat Erya is probably on that list, but most of the others top out mid/high 70's.

A 25 pitch prop, turning 5800 through 1.75 gears has a theoretical max speed of 78. Add in an average bass boat slip of 10 percent, and that drops to 70mph. Lower slip percentages than 10 percent are very tough to attain with a bass boat, so if you are there, your setup is truly dialed in.

so what is theoretical max on a 26 pitch with 5800 rpm's ?

if you did 26 inches per revolution x 5800 rpm x 60 min = max possible inches per hour divided by 63360 inches per mile ? that isn't giving me a likely number. Hmmm gear reduction???

[Champ188]

so what is theoretical max on a 26 pitch with 5800 rpm's ?

if you did 26 inches per revolution x 5800 rpm x 60 min = max possible inches per hour divided by 63360 inches per mile ? that isn't giving me a likely number. Hmmm gear reduction???

Math skeers me. I'm a words guy.

[ness]

Interesting reading for me -- I had no idea you guys were running boats that fast. One question: when you say "GPS" speed, is that what it sounds like -- what your GPS is telling you your speed is?

[Alex Heitman]

Ness you are correct. That is the speed according to the gps which is more accurate than speedometer. I never run that fast unless it's a tournament blast off and I'm taking a ride far from take off. Still after that if in fishing areas relatively close to each other I don't get all excited and run WOT. I prefer cruising at 40-45 if I'm foshing for fun.

[fishinwrench]

Oh boy, it's gettin' deep in here.

[mixermarkb]

Ham-

http://www.go-fast.com/Prop_Slip_Calculator.htm

Ad an inch for a cupped prop

[dtrs5kprs]

For comparison purposes, my single-console Ranger Z119c with a 225 Pro XS and 25p Tempest Plus will GPS at 70 mph on the nose (GPS) at 5950 RPM in perfect conditions (water temps of 50 degrees or below and a light chop). That's with an average load of gear/fuel and a well-above average human load (shut up Babler and denjac).

That's also figuring in a pretty light load in the livewell.

Well shoot, maybe my Ranger is fast after all.

[dtrs5kprs]

so what is theoretical max on a 26 pitch with 5800 rpm's ?

if you did 26 inches per revolution x 5800 rpm x 60 min = max possible inches per hour divided by 63360 inches per mile ? that isn't giving me a likely number. Hmmm gear reduction???

Just ran those numbers, and yes, that is highly improbable. Think "real" difference is because it does not take anything else related to the boat or lake into account- hull, weight, water temp, etc. Just gives you the maximum possible number, if the prop were just spinning on a stick like a pinwheel.

That is all the math I intend to do today. You may have injured me.