24p Trophy, 225 Promax and 19.5 bassboat...zero hole shot

[Fast4wrd]

Ok...prop experts, gather round.

Heres what I have:

19' 5" Charger bassboat
225 Promax
24p Trophy

ok...on take off...nothing...nose up in the air and spin
she revs way up and makes lots of noise, but when she takes off, she gets up and goes.

so...heres the question:

is it: jackplate setting, wrong prop or how do I find out which it is? where do I start?

I am not familar with the procedure for identifying where the problem is, and when you do, correcting it.

Please give me straightforward, apprentice type, tips. I am no expert by any stretch. I understand the basics but need good solid information on how to first identify the issue and then, correcting it.

[msm]

It's likely the motor revs way up because the prop blades are injesting too much air (motor too high on the transom), or too much exhaust, or both. I'm assuming you have a manual jack plate that is set high for best top speed. Try lowering it. If that solves or significantly reduces the problem, you should probably invest in a power jack plate that easily allows you to lower the engine before attempting to plane. Once on plane you can then raise the engine to reduce drag and get best top speed. Also, depending on the type of Trophy you have (Trophy (old) or Trophy Plus (new)), it'll say on the hub, you may be able to reduce the amount of exhaust gas flowing over the blades by putting plugs in the vent holes. These plastic plugs ($.85) fit on the Trophy Plus and are called Performance Vent System (PVS) by Mercury. Prior to the Trophy Plus (non PVS), the old Trophys were available in large hub (4.75 inch diameter, the same diameter as the gear case) and small hub (4.25 inch diameter). The small hub allows for more exhaust gas to get to the blades. You may want to look for an old large hub Trophy or any prop with a full sized hub if you determine too much exhaust is getting to the blades. Good luck future guru! Be sure to report back if you need more answers.

[Fast4wrd]

Excellent response. thank you!

You are correct, it is a manual jack plate. Also, I didnt do the rigging on this, i had a (inexperienced, it seems) marina do it so I am running blind on info.

It is the Trophy Plus 24p prop. I looked but didnt see any holes ...I will look again. The way this boat is set up now, I am guessing you are right and the motor needs to be lowered, first. Then the fine tuning can come after...

[pyro]

Bury the trim, make sure it's down all the way and "tucked under"

My Trophy still gets me on plane, even with the jack set up high.

[Fast4wrd]

its more than that.

Pure and simple, something is WAY out of adjustment.

[Cp]

Not sure where in MN you are, but I would recommend taking your boat to GPI in Avon and have Randy and Torq fix your setup. These guys know their stuff!

GPI : 320-356-9068

Cp

[PFord]

First that is just the way a Trophy does on a heavierand some lighter boats, it is either going to slip like crazy or lug but when it hooks up it is like you hit the nitrous. You may want to experiment with the PVS plugs in the prop if it has them. The other thing is the motor probably is not the best suited for the boat you have. The ProMax is desighned for lighter boats, not to say it will not work but there are probably engines more suited for it. I had a 26 on my Bullet and the last time I used it I could barely get on plane so I sold it and never looked back, the overhubs just had a much better holeshot. Granted once it was running it ran great.

[Fast4wrd]

This is the Trophy Plus 24p prop, non PVS

I will say, that once this boat is up on the water and leveled off, it goes...I will get GPS set up on it soon and see what its doing, but I will shocked if its not pushing 70-75.

this motor works fine...on top...its getting there that is my concern. I dont want to over rev the motor time and time again to get up on plane and thats exactly what it takes to get there.

thanks for all the input guys...it all helps!

[PFord]

One you can do is have more cup put in the blades and then open the vent holes up or probably the best thing to do is get a Tempest 3 blade or maybe a Yamaha Pro series 3 blades. My recomendation would be to go to a 23 Tempest, it will probably be faster and have a better holeshot. With the ProMax you want to run at WOT around 6500 if you can, you never mentioned the rpms you are running so the 23P is just a guess.

[I need speed "B"]

You should use a carpenters level and a ruler to see how far the prop shaft is below your running pad. "Motor height" is a very general term, start by setting your prop shaft about 3in.
below the running pad with your motor in a vertical position
and WATCH YOUR WATER PRESSURE GAUGE. Look for a MIN.
10 PSI. at WOT, and in turns. Trophy's are great props I have a small hub 23P non (PVS) one on my 84 373 ranger with a Bob's nose cone and my prop shaft is about 2in. below my running pad. :cool: