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Surface Piercing Propeller Slip

Old 01-03-2024, 02:36 PM
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Default Surface Piercing Propeller Slip

Hi,
Anyone who can make a good guess of propeller slip with 2x ASD8 std. installation hight on a Scarab 302 Centre Console 24deg V-bottom with 17.5x32P 4-blade #6 Mercruiser Racing propps...??
Total weight on boat: 6000lbs

Regards
Richard
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Old 01-04-2024, 12:11 PM
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hp? rpm?speed?
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Old 01-04-2024, 05:44 PM
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I dont` have a crystal ball so I cant help.
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Old 01-05-2024, 09:45 AM
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Going to pay attention to this one: I have yet to find a "calculator" that works for Surface drives....be great info as I am trying to get my repowered ASD8 setup right
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Old 01-05-2024, 10:30 AM
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On my Outerlimits I am running a 6 blade 17X36X21R with a 1.50 @ 5850RPM @ 111mph. That comes out to a 17% slip rate. Don't get hung up too much on the slip, some of the best running boats have a good amount of slip.
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Old 01-05-2024, 10:33 AM
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Originally Posted by 302Sport
On my Outerlimits I am running a 6 blade 17X36X21R with a 1.50 @ 5850RPM @ 111mph. That comes out to a 17% slip rate. Don't get hung up too much on the slip, some of the best running boats have a good amount of slip.
what horsepower and hull from OL? Thanks
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Old 01-05-2024, 10:57 AM
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Originally Posted by 302Sport
On my Outerlimits I am running a 6 blade 17X36X21R with a 1.50 @ 5850RPM @ 111mph. That comes out to a 17% slip rate. Don't get hung up too much on the slip, some of the best running boats have a good amount of slip.
I'm using a Mercury 5 blade 32 17.5 diameter 21deg rake. Slip is 13.8%. 102 at 5850.
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Old 01-05-2024, 12:00 PM
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Originally Posted by Cms51
what horsepower and hull from OL? Thanks
SL-44 with Mercury 700's
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Old 06-10-2024, 12:05 PM
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Mines a heavy slower boat but the slip is interesting. Running herring 4 blade 18x32x15 rake, Boat ran 85 at 5200rpm. Then I got some mercury 5 blade 18x35x18 rake, boat runs 77 at 4900 (haven't pushed it past that) it turns the bigger props easy, but they just slip like crazy. Tried all different trim settings. George at cool breeze at LOTO told me my boat might just "like the 4 blade props better".
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Old 06-10-2024, 02:54 PM
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It might be your diameter. we have found that the 38s and 43s staggered like 17.5 diameter better doesn't lift the transom so much. Just my two cents!
Thats with number 6's
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