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Driving/ Tech Advice???

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Old 01-13-2002, 11:07 PM
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Hey all,

Having just bought my first OffShore/Performance boat in August I've got a question for ya that's been bothering me.

The boat: 1996 26' Scarab w/ 502mpi

During a trip to LOTO the weekend of the Shootout, about the 6th time I had this boat out. Water conditions were pretty typical for LOTO on this weekend. 2-3' chop w/ some bigger water thrown in for good measure.

I had 8 people on the boat, full of gas, 80 gal. I was able to run pretty consistant at around 40mph, working throttle, trim, and tabs regularly. When I would come up on some REAL large water from other boats I would back off a little. When doing this, my boat would blow-out. (I guess that's what it's called, the prop would come unhooked) It would ALWAYS happen when I would back off in large water. I would try to catch it by trimming down or quick throttle adjustments, but no luck. I would have to completely let the boat settle in the water before I could load the prop again. VERY irritating and embarrasing.

Was there something I could have done different when driving the boat?

Could it be my prop set-up or X dimension?

Maybe the trim or where I had the tabs set?

I had the lower unit trimmed up to about 4 on my guage. Had to drop the tab couple of notches to keep her in the water.

Ideas anyone?????

All help is appreciated. I am learning.


Buck
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Old 01-13-2002, 11:40 PM
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Sounds like it was falling off plane due to the weight and lower power setting. This would cause the boat to "see-saw" forward and lift the prop into jumbled water. The air in the water would cause it to cut loose. In that size boat it is very hard to get any kind of real performance with that much weight on board. Add to that the fact that the hull is designed to run "loose" and you see why performance would be impaired. I would try pulling the drive in and maybe adding a little tab to help it plane but you may not be able to make that a good "people hauler". Maybe you could get one of your freinds to buy a boat and split up 4 and 4
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Old 01-13-2002, 11:43 PM
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Oh BTW, if you continue to need the ability to cart around 8 people, maybe we can trade, I got a nice big, wide 28' cruiser that will schlep them all around in comfort
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Old 01-13-2002, 11:48 PM
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LOL! Wish I could afford something bigger right now.

I figured the weight in the boat had a lot to do w/ it. It just seemed to happen a lot, enough to be very irritating.

Guess I need to find some freinds w/ more money, huh?

Buck
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Old 01-14-2002, 12:04 AM
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what prop are you running
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Old 01-14-2002, 12:08 AM
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Well, I have a 30ft Scarab...

If conditions permit it, and its safe... its better to HAUL ASS thru it... or OVER IT, then get stuck in it.

 
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Old 01-14-2002, 12:10 AM
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When running slower heavier loads change your prop and prop down--2" smaller and use a 4 blade bravo prop. Remember no one prop will do it all. I have 2 depending on conditions.
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Old 01-14-2002, 12:14 AM
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FloridianSon,

I think it's a 23P Mirage. Heavy on the think!


Nick, I like the idea of just staying on top of the bad stuff. Some of the passengers were complaining about that part of my driving. Guess I should have told them to swim where we were going.

Marty, the idea of a different prop for that kind of load makes sense to me.

Buck
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Old 01-14-2002, 03:27 AM
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"Maybe the trim or where I had the tabs set?

I had the lower unit trimmed up to about 4 on my guage. Had to drop the tab couple of notches to keep her in the water.

Ideas anyone????? "

Sounds to me like you might have been trimmed to high, don't know where 4 is on your gauge, your prop shaft should have been still pointing down, trimmed in.
If you were going to try running on top you would probably want the propshaft and tabs parrallel with the bottom,
if you are running the tabs down it doesn't make sense to have the drive trimmmed up past parrallel to the bottom.
Hope you can understand what I'm trying to say.
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Old 01-14-2002, 08:23 AM
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Buck, I've got a 23P Bravo 4-blade on ebay right now. I does not include a hub. No reserve. That would probably help you out a lot.
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