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Im not sure where to post..but I cant get my boat to lift the nose..

S

stlcheckmate

Member
Well after installing the 6 inch hydraulic jackplate, and a new lower unit with a nose cone and low water pick up, we went out to test some props, well my laser II sucked, so went back put the boat on the trailer, and changed to a 24 pitch offshore chopper. Well I still cant get the front of the boat to lift out to set the boat back on the pad (what little pad my boat has). And that was trimmed all the way up, HUGH rooster tail..looked cool though.. So I dont know what to do, its a 20 foot enchanter with a 150 xr4. Oh ya with the motor up about 2 inches and with the chopper it still only ran 57 mph.

Thanks
Chris
 
stlcheckmate said:
Well after installing the 6 inch hydraulic jackplate, and a new lower unit with a nose cone and low water pick up, we went out to test some props, well my laser II sucked, so went back put the boat on the trailer, and changed to a 24 pitch offshore chopper. Well I still cant get the front of the boat to lift out to set the boat back on the pad (what little pad my boat has). And that was trimmed all the way up, HUGH rooster tail..looked cool though.. So I dont know what to do, its a 20 foot enchanter with a 150 xr4. Oh ya with the motor up about 2 inches and with the chopper it still only ran 57 mph.

Thanks
Chris
Click to expand...

My boat got no bow lift with a Laser II prop on it. I tried a Merc 3 blade large
eared chopper with solid small hub, AND IT SUCKED... Was horrible to plane
off, spun really high RPMs with out going any where.... 60ish. Bow lift was
huge though once you got moving. The turning point classic 4 blade, runs great. Jumps on plane good bow lift, and runs mid 70's


*** I should be getting a commision from turning point... L.o.L
 
well I could hardly even get any bow lift with the chopper even when moving, it was a big eared 24 pitch chopper with the solid hub, how big is your boat what motor? Your running just a turning point? What pitch?
 
i can't imagine needing a nosecone on a 150 on an enchanter

i would think that it is most of your problemb

you only need a nose cone over 80 mph

good luck daren
 
come on, how else could I get a low water pickup on it? And I am not asking about the nose cone, thats not going to cause me not to have lift in the bow..
 
stlcheckmate said:
well I could hardly even get any bow lift with the chopper even when moving, it was a big eared 24 pitch chopper with the solid hub, how big is your boat what motor? Your running just a turning point? What pitch?
Click to expand...

186 pulse, 200 Merc,25"TP,6100 RPM
 
First off: an XR4 trying to push a big Enchanter is definitely NOT a good idea with a nose cone. You're dragging a longer length device through the water now versus the standard lower unit. PLUS, you actually need that lower unit buried 4-5" below the pad to help lift the bow! So two strikes against bow lift by raising engine height and installing the nose cone LU. You REALLY need a 80+ mph boat before you add a nose cone. Otherwise, you're losing speed. Third thing, 6" of jack plate on that long of a hull isn't going to help with only 150 hp. You need to double that setback to notice any real gains with less than 225 horse.

Next, you need the right prop buried. I've had Laser II 24" and 26" and 23" props that really floated the bow of my 17' and 18 1/2' boats. For longer boats, I found the Tempest to float the bow the best. I haven't tried some of the newer props, so I can't attest to the others. Whenever you raise your prop half out of the water, you WILL lose bow lift.

So take that nose coned LU back off, set that propshaft approx. 4" below the pad, and then start prop testing and playing with engine heights. And if you're trying to go 70+ mph, then you'll have to get at least 200 horse out of that motor first..............
 
its turning im guessing about 6200. I only have a 6 grand tach and its past 6 on the tach..well first off the boat is faster now that I have put the jackplate on, and its got more lift out off it now then it did before. and it got faster the more I jacked the motor up.
 
The guys are right about that nose cone. I know you don't want to hear that but you've got some setup issues. If your gear case is 1.87 then you've got 24% slip. Should be more like 10%. That is why you have no bow lift. It's like spinning the wheels of your car on ice.
With 150 HP on that boat I would go to a smaller prop with more grip like a 21" Trophy. Experiment with height until you start getting lift.
Secondly, I would try to find someone willing to trade for a standard gearcase. The nose cone is meant to run level with no positive trim. Mates need trim to lift the bow and a standard gearcase is far more trim friendly.
6" setback is not bad but 8" or 10" would be better. On the bright side 57 MPH is very respectable for any 150 motor/boat combo.
 
did you gain about 5 mph with the addition of the plate? if so you are right on. you may be at the max with your setup.

try setting the prop hsaft 3" below the pad. run that laserII again. you may be too high for the through hub prop right now. i know if i run mine above 2" it blows out.

i am guessing an 8" plate and no cone would be the best for that 150. you should be able to run that merc 2" below the pad and still have good water psi without a LWP.

good luck:bigthumb:
 
I dont think I could go down to a 21 pitch prop, espically since im turing that 24 chopper and 24 laser past 6200 rpm..and 57 mph is gpsed...when I had the laser 2 on there and the motor all the way down, burried in the water the boat only ran 43 mph, then we changed to that 24 pitch big eared chopper that the Seabolts worked on (if you dont know who team Seabolt is check around) I ran 57 and that not even with the jackplate all the way up, that was only up about 1-2 inches..so its still about 3 inches below the pad..I know 57 is respectable for this size boat with a 150 on it, but I would like to get into the 60s, but I might see 60s with just me in the boat. That was 57 with me (260 lbs) and another guy, (probably 220 lbs) half a tank of gas, a tool box and other things in the boat..
 
i agree with alot everbody has said
1st the noise cone wasnt needed but its there now so live with it not worth going back on.
2nd i think the outdrive is 2 high you cant get enough leverage to lift the bow and if you get more boat out of the water that means less drag and less work you moter has to do
 
slip%

you want to enter in rpm, mph, prop size, and l/u gear ratio. the calculator will give you the slip %.

typical slip% on a boat like yours and mine, should be around 11%. you are at 24% that is unheard of. are you sure the tac is correct?

the calculator mark posted works great. this one may be easier for you to understand. http://www.rbbi.com/folders/prop/propcalc.htm

what rpm did you turn when you had it all the way down with the laserII?
 
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