Reply With QuoteI'm seeing about 7% slip with a 4,100-4,300 pound hull. The prop is a bone stock Merc 23 pitch Revolution-4 four blade
[ January 23, 2003, 04:53 PM: Message edited by: rivercrazy ]
I am about to upgrade to another prop better suited to my hull & wondered what anyone else is getting for slip #'s with an offshore style V hull and a single prop? What size hull & weight & prop & slip?
Thanks
I'm seeing about 7% slip with a 4,100-4,300 pound hull. The prop is a bone stock Merc 23 pitch Revolution-4 four blade
[ January 23, 2003, 04:53 PM: Message edited by: rivercrazy ]
rivercrazy:
I'm seeing about 7% slip with a 4,100-4,300 pound hull. The prop is a bone stock Merc 23 pitch Revolution-4 four blade And what for HP? to help put into perspective.
496 Mag HO.
So far on GPS the best I've seen is a shade over 70 but for the most part I'm seeing 68.5 to 69.5 depending on the conditions. These are all GPS'd speeds using a Garmin III+ GPS. Best speed has been in about 1 foot chop and temps in the mid 60's. That's in a 25' Shockwave.
I still cannot believe how well this stock prop works on this boat.
[ January 24, 2003, 08:44 AM: Message edited by: rivercrazy ]
RC what's the Horse Power for the 496 Mag HO? I think I read it was like 375 or 425 but I don't know for sure.
425
rivercrazy:
425 How are you calculating your slip?Seven percent in a 4200lb v bottom is almost not beleivable.Some cats don't even get 7%.I'm impressed if it's true.
I'm not sure if this prop slip calculator is totally accurate or if I botched entering in the figures and got a bogus result.
http://www.go-fast.com/Prop_Slip_Calculator.htm
I'm running 1.5 gears, a 23P 4 blade Rev-4 at 5050rpm and getting 68-70mph on GPS (depending on conditions).
Hi!
The true pitch can be different that the stamped one. Normally you should add one pitch using high rake props or cupped props. If adding one pitch you should be closer to 10% slip, which is very good for that kind of v hull.
Cheers, Toffen G
Thanks for the clarification. So what your saying is that I'm really closer to running a 24 pitch prop for prop slip calc purposes right?
That does sound more reasonable to me. I did always wonder if the slip numbers I'm getting based on the GPS'd speeds were bonefide.
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