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-   -   I need stern lift (https://www.offshoreonly.com/forums/prop-talk/317332-i-need-stern-lift.html)

Andis 08-27-2014 04:22 PM

I need stern lift
 
Hi, I am running a 28 ft Scorpion rigid inflatable with 2x300 verados spinning 21p Rev4s.
Recently repowered the boat from its 2x250 hpdi's (blew them) and the extra weight of the verados squats the stern down - It's a light and slim hull, less than 3000 lbs and 8 ft across, really designed for lighter engines...
I have the engines at the right height (I think, or maybe a touch too high) and get a prop slip of 10%. Boat reaches 67 mph at 6200 wot, and cruises at 44 mph at 4500 rpm.
I love the speed and love the engines, but I need props that would lift the stern more. Do you have any suggestions? How about 5 blades?

Jonesyfxr 08-27-2014 05:09 PM

Contact B Blades, they will guide you in the right direction.

phragle 08-27-2014 05:24 PM

I had a giirl ask me about stern lift once... I told her to try spanx...

Anybody ever tried partially filling a rib with helium???

SB 08-27-2014 05:38 PM

Thanks Phragle - High Pressure Ice Coffee out my mouth. JAckass ! LOL !

Jonesyfxr 08-27-2014 07:02 PM


Originally Posted by phragle (Post 4179150)
I had a giirl ask me about stern lift once... I told her to try spanx...

Lol

540apache 08-27-2014 09:21 PM

I prefer hydromotive, everything they have suggested has worked for me.

turbo rr 08-27-2014 10:34 PM

Have you tried to spin the props inward?

phragle 08-27-2014 11:11 PM

http://krnb.com/kj-midday/wp-content...4/01/Spanx.jpg

Andis 08-28-2014 10:29 AM


Originally Posted by phragle (Post 4179150)
I had a giirl ask me about stern lift once... I told her to try spanx...

Anybody ever tried partially filling a rib with helium???

Helium won't work. It's small molecule size escapes the tube seams too quickly - at the pressure these are supposed to work. Some people use Nitrogen and report 3-4 kts pickup.

Andis 08-28-2014 10:31 AM


Originally Posted by turbo rr (Post 4179314)
Have you tried to spin the props inward?

How would I do that?
Why would it work?


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