porpoising-prop, ballast, or ???
#21
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Okay, now it's Winter here and I have time to analyze this once again. I got a Ron Hill 4 blade 22 for Bravo I. As expected, quick to plane, stern lift, more stability, a little less on the porpoising issue (have determined: less fuel, less porpoise.)
Anyway, I can run about 70 with a 23 Mirage Plus 3 blade. With this particular 4 blade I get close to 60, and the engine's reved out. Now granted, I know I can push a bigger prop, but I'm wondering, could the stern lift be too much already? You can physically feel and see how much more the boat sits higher in the water when running on plane. I'm gonna sell the 22 soon, but wondering should I try a 24 or 26 next?
Thanks ya'll.
Anyway, I can run about 70 with a 23 Mirage Plus 3 blade. With this particular 4 blade I get close to 60, and the engine's reved out. Now granted, I know I can push a bigger prop, but I'm wondering, could the stern lift be too much already? You can physically feel and see how much more the boat sits higher in the water when running on plane. I'm gonna sell the 22 soon, but wondering should I try a 24 or 26 next?
Thanks ya'll.
#23
Geronimo36
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Do you have trim tabs on the boat?
If you do, try running them in a neutral position, even with the bottom of the boat, or just a hair under and see if it improves.
also, what position do you have the drive set? is it over-trimmed?
If you do, try running them in a neutral position, even with the bottom of the boat, or just a hair under and see if it improves.
also, what position do you have the drive set? is it over-trimmed?
#24
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I had the same boat ( but with a 502) from 92'-97'
I never recalled it porpoising...... as mentioned, the ride sucked on anything over a ripple.
I ran a 24 turbo 3 blade on mine....tried a hydro Q4 once ,
didnt work so well.
I'd be looking at the bottom too...the drives on these are pretty deep, 3 blades should be the best performers.
I never recalled it porpoising...... as mentioned, the ride sucked on anything over a ripple.
I ran a 24 turbo 3 blade on mine....tried a hydro Q4 once ,
didnt work so well.
I'd be looking at the bottom too...the drives on these are pretty deep, 3 blades should be the best performers.
#25
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Panther, If I drag some tab, it does help remedy the problem, but, of course, will sacrifice speed.
JT, my hull is stamped late 90, and they changed the hull dimensions the very next year (91 and up), not sure which year had. Mine is titled a 91 but is actually a 90. Yes, skips like a rock on a pond, but launches like a bullet!
Anyway, if anyone needs a test hours only 22p, let me know!!
JT, my hull is stamped late 90, and they changed the hull dimensions the very next year (91 and up), not sure which year had. Mine is titled a 91 but is actually a 90. Yes, skips like a rock on a pond, but launches like a bullet!
Anyway, if anyone needs a test hours only 22p, let me know!!
#26
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[QUOTE=bigbang;3571576]Yes, skips like a rock on a pond, but launches like a bullet!QUOTE]
A friend of mine had one of those many years ago. Yes, it launched like a bullet, but it rode like a floor jack. We always used to bring Rick's boat up when we discussed deadrise and its effects on speed and ability to handle rough water. Yea, Rick had the speed - and a good Chiropractor! One swwet looking boat though!
A friend of mine had one of those many years ago. Yes, it launched like a bullet, but it rode like a floor jack. We always used to bring Rick's boat up when we discussed deadrise and its effects on speed and ability to handle rough water. Yea, Rick had the speed - and a good Chiropractor! One swwet looking boat though!
#27
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Intentional hook in the hull will raise the stern and cause the boat to ride flatter with less porpoising. So, I doubt your boat has a hook. Boats with a rocker in them ride with more bow lift and tend to porpoise more as they can, well, rock back and forth. Add a prop that tries to carry the bow but can't and the porpoising gets worse.
Now unintentional hook in the wrong spot, only on one side, etc would give you some weird handling issues.
Just put a straight edge under the last 4' of the boat on each side and see what you have.
For a prop my vote is for a Rev4. Fast 4-blade with much better bow lift than a Bravo and much better handling than a Mirage +. Every boat is different but I went through the same thing. I was certain a stern lifting prop would help as the boat would ride flatter. Both the Bravo and Quad4 may my boat handle horribly.
As others have said try just barely dragging the tabs. My boat has a slight rocker and if I really hang my boat out all the way in calm water it porpoises. Dragging the tabs just slightly calms it down and scrubs very little speed(about 2mph). At cruise I HAVE to drag tab.
Just my point-o-two.
Now unintentional hook in the wrong spot, only on one side, etc would give you some weird handling issues.
Just put a straight edge under the last 4' of the boat on each side and see what you have.
For a prop my vote is for a Rev4. Fast 4-blade with much better bow lift than a Bravo and much better handling than a Mirage +. Every boat is different but I went through the same thing. I was certain a stern lifting prop would help as the boat would ride flatter. Both the Bravo and Quad4 may my boat handle horribly.
As others have said try just barely dragging the tabs. My boat has a slight rocker and if I really hang my boat out all the way in calm water it porpoises. Dragging the tabs just slightly calms it down and scrubs very little speed(about 2mph). At cruise I HAVE to drag tab.
Just my point-o-two.
#28
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Panther, If I drag some tab, it does help remedy the problem, but, of course, will sacrifice speed.
JT, my hull is stamped late 90, and they changed the hull dimensions the very next year (91 and up), not sure which year had. Mine is titled a 91 but is actually a 90. Yes, skips like a rock on a pond, but launches like a bullet!
Anyway, if anyone needs a test hours only 22p, let me know!!
JT, my hull is stamped late 90, and they changed the hull dimensions the very next year (91 and up), not sure which year had. Mine is titled a 91 but is actually a 90. Yes, skips like a rock on a pond, but launches like a bullet!
Anyway, if anyone needs a test hours only 22p, let me know!!
much better.