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Second run, LOTS of slip!

Vandalizer

Vandalizer

Well-known member
So I took her out for a final run today. Had the top three water intake holes plugged, so I figured why not? Jacked the motor up .75" ... I gained a whopping 1mph to get to 63, but gained 600RPM. For anyone wondering, that's 63mph @ 6000rpm... 15% slip!!! I was seeing about 4% slip .75" lower. So, I'll need to go down in the spring, she's now :sleep: for the winter!

It was between 40-45F while I was running around, my legs and feet were numb when I got back to the dock, glad I remembered my hat!
 
Nice, maybe try .625" lower to find a happy medium. Have you run it lower/slower or is 1.5" where you started?
 
I honestly need to get another BETTER measurement. I thought I was running about 2" below for the first time out, but my technique was lacking- i need a metal straightedge. I went 0.75" up because that's the extra distance I gained by plugging the three holes, so I figured I'd at least be safe there.
 
Water pressure 15# at WOT.
The plugged holes worked great, but it turns out i may not have needed to do it. Oh well, it was fun.
 
ToP_Enticer said:
So I took her out for a final run today. Had the top three water intake holes plugged, so I figured why not? Jacked the motor up .75" ... I gained a whopping 1mph to get to 63, but gained 600RPM. For anyone wondering, that's 63mph @ 6000rpm... 15% slip!!! I was seeing about 4% slip .75" lower. So, I'll need to go down in the spring, she's now :sleep: for the winter!

It was between 40-45F while I was running around, my legs and feet were numb when I got back to the dock, glad I remembered my hat!
Click to expand...

Is 4% a common slip rate on a smaller O/B boat. I know 15% is a normal slip rate on a I/O Convincor. Dont have a clue on a O/B
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Wow im gunna have to change to a bigger prop to run with you guys on the river next spring lol .
 
BR- I think slip that low is common for mates my size... part of slip is hull design, but weight plays a role too- hence higher slip for the I/Os.
 
I'm happy with it... considering the slip #'s I'm seeing and the fact that I got right back to the rev limited speed, I think I can eek out a couple more MPH and get to 65! :bounce:
 
I was getting 7% with that laserII you are running. I think it hoks up real well when its all the way in the water. I saw alot more slip when it was lifted as well.

11% is common for a surface running prop like a chopper on a light hull.

I have been seeing 12-15% on my Starflite.
 
I was surprised how well my boat cornered with the motor that high!! I expected it to blow out in the corners, but it STUCK. It was amazing.
 
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