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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 |
hp? rpm?speed?
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I dont` have a crystal ball so I cant help.
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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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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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Originally Posted by 302Sport
(Post 4888168)
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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Originally Posted by 302Sport
(Post 4888168)
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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Originally Posted by Cms51
(Post 4888170)
what horsepower and hull from OL? Thanks
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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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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 |
Originally Posted by hblair
(Post 4900158)
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".
Same slip to 5200 rpm gives 82mph. Not far off the 4 blade max speed. Maybe the extra rake is giving it a hard time. You're turning in? How is the cruising performance of the new props? |
Originally Posted by Tartilla
(Post 4900307)
29% slip with the Herrings @ 77mph.4900 rpm
Same slip to 5200 rpm gives 82mph. Not far off the 4 blade max speed. Maybe the extra rake is giving it a hard time. You're turning in? How is the cruising performance of the new props? The 29% slip is with the mercury props. About 16% slip with the herrings. Yes props are turning in. As far as cruising, we ran it Sunday and I remember seeing around 50mph at 3100rpm. Which is like 39% slip. The rooster tail even looks lazy lol. I trimmed up and down, didn't help. Trimming up increased rpm but not speed. Kind of odd. Sorry original poster, not trying to hijack your thread. |
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