artic and uncle dave
i spend most of the time on a river and small lake.....i will take the boat out in 2 weeks to get real numbers at cruising but it seems to me its gonna be in the 55mph range at 4000rpms....so my slippage is high i guess because of my extension boxes therefore i was leaning for 5 blade props but i dont want to be changing shafts and gears everyother time out also...i may get my current props reworked and go from there but at the same time i could put that money towards a set of 5 blades...break out another thousand
Single engined...v-hull...stepped hull...tend to be fastest around the high teens for slip.
I have done alot of testing on my Nordic...it does a consistant 105...and slip is around 19% at full speed.
Arctic friends has done a lot of testing...and his slip is right there.
The Howard Bullet that did nearly 130 mph+/-, and is still the fastest single engined v-hull that I know of ....had slip numbers around 21%.
I am the fastest with a merc lab prop...and use a five blade (p5-x) for pulling my kids on an inner-tube.
The prop I most normally use is just a standard bravo....it hooks up better in the low and mid-range than the lab prop.
Last edited by CB-BLR; 10-21-2011 at 10:01 AM.
I have tried different things that lowered my slip and gained ZERO speed or lost , broke part faster and torque loaded boat. My boat and drive is pretty happy around 20% and can hit 100mph (almost), twin engine might be a different story. The 35% that Sea dated had seems horrible, I can't imagine having 32 pitch props and cruising at 52 mph at 4000 rpm's, that boat was BEGGING for bigger props!! I would still like to hear what Mr sneakattack has for drives, heavy boat with 800 hp, if he can afford it buy beefier drives (scx or Konrad) and find the best prop be it a 5 blade or 6 blade even, Smitty
Last edited by articfriends; 10-21-2011 at 05:07 PM.
bravo's...i know ball bust is coming i understand....i had a b max with my cat and it held up good with 900 true horsepower....so future plan is maybe b maxes....
I assume a 272 with 900 HP can carry the bow due to so much horsepower at speed.
if you are on the rev limiters all the time I would try a set of 32" p5x if not try 31". the maximus is a much bigger prop and i would start with a 30" if you decide to try those but they really hook up well and may put to much load on your drives.
my boat no step 37 ft center console at 40mph with 26" bravos 20% slip 3100 rpm, with 24" maximus 10% slip at 2950 rpm.
update....i took the props off and brought them to a local prop shop and have found out they have been reworked and were only 30.5 pitch props.....so my slip isnt the issue....im getting them pitched to 33's and hopefully run this weekend and go from there..
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