|
Forums59
Topics1,057,131
Posts14,280,187
Members144,604
| |
Most Online39,925
Dec 30th, 2023
|
|
 Jack Plate Adjustment
#13600030
06/18/20 09:43 PM
|
Joined: Jul 2011
Posts: 377
buggsboy
OP
Angler
|
|
OP
Angler
Joined: Jul 2011
Posts: 377 |
It’s been a long time since I tinkered with this, but I would like to adjust my jack plate for a better hole shot. Should I raise it or lower it for a better hole shot? Thanks
PB. 10 lb 12 oz
|
|
|
Re: Jack Plate Adjustment
[Re: buggsboy]
#13600058
06/18/20 10:03 PM
|
Joined: Jul 2010
Posts: 1,432
boatman025
Extreme Angler
|
|
Extreme Angler
Joined: Jul 2010
Posts: 1,432 |
Call Steve at Hydro Dynamics 903-762-9907
Hughes Marine
3855 Osage Lane
Wylie ,Texas
|
|
|
Re: Jack Plate Adjustment
[Re: buggsboy]
#13600503
06/19/20 04:34 AM
|
Joined: Feb 2015
Posts: 4,740
Flippin-Out
TFF Team Angler
|
|
TFF Team Angler
Joined: Feb 2015
Posts: 4,740 |
It’s been a long time since I tinkered with this, but I would like to adjust my jack plate for a better hole shot. Should I raise it or lower it for a better hole shot? Thanks Do you not realize that question can't be addressed without first knowing WHERE the prop-shaft is now, with respect to the hull? Also, RPM running, and max operating RPM for your engine as set up now. The jackplate setback matter. Which prop (model and size) also matters, as some run better deep, some run better less deep. It could be that you have a less than ideal prop to begin with, and no jackplate adjustment is going to be able to correct that.
Last edited by Flippin-Out; 06/19/20 04:37 AM.
|
|
|
Re: Jack Plate Adjustment
[Re: buggsboy]
#13600591
06/19/20 12:03 PM
|
Joined: Mar 2010
Posts: 28,875
T Bird
TFF Guru
|
|
TFF Guru
Joined: Mar 2010
Posts: 28,875 |
A good starting point is to set prop shaft 3.5" below pad of hull. Use 1/4" adjustments on jack plate until you achieve best hole shot. ![[Linked Image]](https://texasfishingforum.com/forums/pics/userpics/2020/06/full-47849-56084-unnamed_1.jpg)
Okie by birth, Texan by choice. ![[Linked Image]](https://texasfishingforum.com/forums/pics/userpics/2021/01/full-47849-80883-111.jpg) USAF "Thunderbirds" Alumni 1985-1989
|
|
|
Re: Jack Plate Adjustment
[Re: buggsboy]
#13600665
06/19/20 12:54 PM
|
Joined: Jan 2005
Posts: 21,766
Pat Goff
TFF Guru
|
|
TFF Guru
Joined: Jan 2005
Posts: 21,766 |
Holeshot adjustment is either A or B..
A: You get moving and the prop cavitates and blows out. Your motor is too high and lower until the cavitation stops.
B: The motor lugs along until it finally gets enough rpms to break over and go. Your motor is too low.
Now, you're going down the wrong trail for the wrong reasons.
Your prop has vent holes (should have) that allow exhaust gas to escape and break the prop blades free enough to spool up and go.
Most of us who setup boats, with your regular fishing load, we find the optimum height for performance, set the plate there, then adjust the vents to assist with holeshot.
Here's the BIG IF...IF your prop is not running at the top end of your motors RPM range, you've got the wrong prop and no amount of adjustment will help. Get that right first, and everything else will work better from there.
Pat Goff Seadrift TX ![[Linked Image]](https://i.ibb.co/X48Kbbq/scooter-shallow.jpg)
|
|
|
Re: Jack Plate Adjustment
[Re: buggsboy]
#13601253
06/19/20 08:16 PM
|
Joined: Aug 2015
Posts: 494
rebait
Angler
|
|
Angler
Joined: Aug 2015
Posts: 494 |
I vote for Pat's KISS method. I've seen these discussions go on for hours, days , weeks and months on these boards. The folks that don't overthink have the most time for fishing and boating.
|
|
|
Re: Jack Plate Adjustment
[Re: Pat Goff]
#13601369
06/19/20 10:27 PM
|
Joined: Sep 2003
Posts: 5,875
Bruce's
TFF Celebrity
|
|
TFF Celebrity
Joined: Sep 2003
Posts: 5,875 |
Holeshot adjustment is either A or B..
A: You get moving and the prop cavitates and blows out. Your motor is too high and lower until the cavitation stops.
B: The motor lugs along until it finally gets enough rpms to break over and go. Your motor is too low.
Now, you're going down the wrong trail for the wrong reasons.
Your prop has vent holes (should have) that allow exhaust gas to escape and break the prop blades free enough to spool up and go.
Most of us who setup boats, with your regular fishing load, we find the optimum height for performance, set the plate there, then adjust the vents to assist with holeshot.
Here's the BIG IF...IF your prop is not running at the top end of your motors RPM range, you've got the wrong prop and no amount of adjustment will help. Get that right first, and everything else will work better from there.
 Here's the BIG IF...IF your prop is not running at the top end of your motors RPM range, you've got the wrong prop and no amount of adjustment will help. Get that right first, and everything else will work better from there.
Fishing Texas lakes one at a time
|
|
|
Re: Jack Plate Adjustment
[Re: Pat Goff]
#13602955
06/21/20 04:35 PM
|
Joined: Nov 2014
Posts: 27,310
SteezMacQueen
TFF Guru
|
|
TFF Guru
Joined: Nov 2014
Posts: 27,310 |
Holeshot adjustment is either A or B..
A: You get moving and the prop cavitates and blows out. Your motor is too high and lower until the cavitation stops.
B: The motor lugs along until it finally gets enough rpms to break over and go. Your motor is too low.
Now, you're going down the wrong trail for the wrong reasons.
Your prop has vent holes (should have) that allow exhaust gas to escape and break the prop blades free enough to spool up and go.
Most of us who setup boats, with your regular fishing load, we find the optimum height for performance, set the plate there, then adjust the vents to assist with holeshot.
Here's the BIG IF...IF your prop is not running at the top end of your motors RPM range, you've got the wrong prop and no amount of adjustment will help. Get that right first, and everything else will work better from there.
What if the prop is a Yamaha Reliance prop without venting plugs? I ask, because that is the prop on my Yamaha F150 4-S. It used to jump out of the hole, now with extra and bigger batteries along with dual PowerPoles, it struggles a little with two guys, tourney load, and live wells full of water. The prop is a 13-3/4†19p. Rpms are close to 6500-6800 trimmed out. Top speed is 59.5 with heavy load and two grown men. 61 empty wells and just me with light fuel. Top speed is not my priority. Acceleration and handling are what I want. Should I look at propping down to a 18p? It would help holeshot, but I’m already bumping the rev limiter from time to time.
Eat. Sleep. Fish.
|
|
|
Re: Jack Plate Adjustment
[Re: SteezMacQueen]
#13602985
06/21/20 05:03 PM
|
Joined: Mar 2010
Posts: 28,875
T Bird
TFF Guru
|
|
TFF Guru
Joined: Mar 2010
Posts: 28,875 |
Holeshot adjustment is either A or B..
A: You get moving and the prop cavitates and blows out. Your motor is too high and lower until the cavitation stops.
B: The motor lugs along until it finally gets enough rpms to break over and go. Your motor is too low.
Now, you're going down the wrong trail for the wrong reasons.
Your prop has vent holes (should have) that allow exhaust gas to escape and break the prop blades free enough to spool up and go.
Most of us who setup boats, with your regular fishing load, we find the optimum height for performance, set the plate there, then adjust the vents to assist with holeshot.
Here's the BIG IF...IF your prop is not running at the top end of your motors RPM range, you've got the wrong prop and no amount of adjustment will help. Get that right first, and everything else will work better from there.
What if the prop is a Yamaha Reliance prop without venting plugs? I ask, because that is the prop on my Yamaha F150 4-S. It used to jump out of the hole, now with extra and bigger batteries along with dual PowerPoles, it struggles a little with two guys, tourney load, and live wells full of water. The prop is a 13-3/4†19p. Rpms are close to 6500-6800 trimmed out. Top speed is 59.5 with heavy load and two grown men. 61 empty wells and just me with light fuel. Top speed is not my priority. Acceleration and handling are what I want. Should I look at propping down to a 18p? It would help holeshot, but I’m already bumping the rev limiter from time to time. 19 P 4 Blade ![[Linked Image]](https://texasfishingforum.com/forums/pics/userpics/2020/06/full-47849-56339-performance4240x165.png) http://www.yamahapropselector.com/propSelector/web/inner.html
Last edited by T Bird; 06/21/20 05:04 PM.
Okie by birth, Texan by choice. USAF "Thunderbirds" Alumni 1985-1989
|
|
|
Re: Jack Plate Adjustment
[Re: buggsboy]
#13603010
06/21/20 05:39 PM
|
Joined: Feb 2015
Posts: 4,740
Flippin-Out
TFF Team Angler
|
|
TFF Team Angler
Joined: Feb 2015
Posts: 4,740 |
Steez, I wonder if you're getting the odd performance you describe due to the smaller diameter you have right now. You're already at the rev limiter, so lower pitch makes that worse, and you slow down. I think that smaller prop (diameter) isn't generating the thrust you need even though the F150 seems to be able to spin it more than adequately. Does it bog down (with respect to RPM) in the holeshot, or does it sound like the revs are high because it broke loose from the "grip" on the slipstream? Here's a prop with more diameter. (14 1/2, 3/4 inch more than your current prop) Read what Yamaha says about it: PERFORMANCE XTâ„¢ A large, long blade design increases strength and durability. Perfect for older, heavier bass boats with jack plates or high engine mounting heights. Lower pitches ideal for pontoons, F150 and up. Link for Yamaha Prop
|
|
|
Re: Jack Plate Adjustment
[Re: buggsboy]
#13603151
06/21/20 08:08 PM
|
Joined: Jan 2005
Posts: 21,766
Pat Goff
TFF Guru
|
|
TFF Guru
Joined: Jan 2005
Posts: 21,766 |
Four strokes need rpms to develop horsepower. A good prop guy can add vents that help it spoil up and go. Easy modification.
Pat Goff Seadrift TX
|
|
|
Re: Jack Plate Adjustment
[Re: buggsboy]
#13603249
06/21/20 10:12 PM
|
Joined: Jul 2011
Posts: 377
buggsboy
OP
Angler
|
|
OP
Angler
Joined: Jul 2011
Posts: 377 |
Thanks for all the information. Here is my setup:
2009 Nitro Z7 18’ 8â€
Mercy 150 EFI
YAMAHA 23M PROP ( 14 1/2†dia, high lift design, NO PLUGS)
Hydrodynamics 6†Magnum jackplate
58-60 mph gps
5500-5600 rpm
3 1/2†p to p
23 psi wp
Slow hole shot. Advice needed if possible. This is just me in boat. Empty
Iive well, 1/2 tank of gas, me at 198 lbs. Thanks
Last edited by buggsboy; 06/21/20 10:13 PM. Reason: Spelling
PB. 10 lb 12 oz
|
|
|
Re: Jack Plate Adjustment
[Re: T Bird]
#13603362
06/21/20 11:38 PM
|
Joined: Oct 2019
Posts: 546
TomRom
Pro Angler
|
|
Pro Angler
Joined: Oct 2019
Posts: 546 |
Now that is a helpful response. A good starting point is to set prop shaft 3.5" below pad of hull. Use 1/4" adjustments on jack plate until you achieve best hole shot.
|
|
|
Re: Jack Plate Adjustment
[Re: SteezMacQueen]
#13603365
06/21/20 11:43 PM
|
Joined: Oct 2019
Posts: 546
TomRom
Pro Angler
|
|
Pro Angler
Joined: Oct 2019
Posts: 546 |
Go on Bass Boat Central and ask your question on the prop forum. Better yet ask Mark Croxton. He designs props and designed props for Yamaha. He is a board sponsor on Bass Boat Central. marksprops.com Holeshot adjustment is either A or B..
A: You get moving and the prop cavitates and blows out. Your motor is too high and lower until the cavitation stops.
B: The motor lugs along until it finally gets enough rpms to break over and go. Your motor is too low.
Now, you're going down the wrong trail for the wrong reasons.
Your prop has vent holes (should have) that allow exhaust gas to escape and break the prop blades free enough to spool up and go.
Most of us who setup boats, with your regular fishing load, we find the optimum height for performance, set the plate there, then adjust the vents to assist with holeshot.
Here's the BIG IF...IF your prop is not running at the top end of your motors RPM range, you've got the wrong prop and no amount of adjustment will help. Get that right first, and everything else will work better from there.
What if the prop is a Yamaha Reliance prop without venting plugs? I ask, because that is the prop on my Yamaha F150 4-S. It used to jump out of the hole, now with extra and bigger batteries along with dual PowerPoles, it struggles a little with two guys, tourney load, and live wells full of water. The prop is a 13-3/4†19p. Rpms are close to 6500-6800 trimmed out. Top speed is 59.5 with heavy load and two grown men. 61 empty wells and just me with light fuel. Top speed is not my priority. Acceleration and handling are what I want. Should I look at propping down to a 18p? It would help holeshot, but I’m already bumping the rev limiter from time to time.
Last edited by TomRom; 06/21/20 11:56 PM.
|
|
|
Re: Jack Plate Adjustment
[Re: SteezMacQueen]
#13603832
06/22/20 12:55 PM
|
Joined: Aug 2006
Posts: 7,186
steve@S2Marine
TFF Celebrity
|
|
TFF Celebrity
Joined: Aug 2006
Posts: 7,186 |
Holeshot adjustment is either A or B..
A: You get moving and the prop cavitates and blows out. Your motor is too high and lower until the cavitation stops.
B: The motor lugs along until it finally gets enough rpms to break over and go. Your motor is too low.
Now, you're going down the wrong trail for the wrong reasons.
Your prop has vent holes (should have) that allow exhaust gas to escape and break the prop blades free enough to spool up and go.
Most of us who setup boats, with your regular fishing load, we find the optimum height for performance, set the plate there, then adjust the vents to assist with holeshot.
Here's the BIG IF...IF your prop is not running at the top end of your motors RPM range, you've got the wrong prop and no amount of adjustment will help. Get that right first, and everything else will work better from there.
What if the prop is a Yamaha Reliance prop without venting plugs? I ask, because that is the prop on my Yamaha F150 4-S. It used to jump out of the hole, now with extra and bigger batteries along with dual PowerPoles, it struggles a little with two guys, tourney load, and live wells full of water. The prop is a 13-3/4†19p. Rpms are close to 6500-6800 trimmed out. Top speed is 59.5 with heavy load and two grown men. 61 empty wells and just me with light fuel. Top speed is not my priority. Acceleration and handling are what I want. Should I look at propping down to a 18p? It would help holeshot, but I’m already bumping the rev limiter from time to time. Send that Reliance to Josh here at Steve's Custom Props and have him drill PVS holes in the barrel. and buy a set of plugs.. problem solved. 
S2 Marine 714 S. Main Quitman, Tx. 75783 www.s2marine.coms2marinesales@gmail.com Blazer Boats, Excel Boats, Sun Chaser Pontoons, Thor boats, Legend Craft Boats
|
|
Moderated by banker-always fishing, chickenman, Derek ðŸ, Duck_Hunter, Fish Killer, J-2, Jacob, Jons3825, JustWingem, Nocona Brian, Toon-Troller, Uncle Zeek, Weekender1
|
