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Dec 30th, 2023
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 Trim....speed.... best way?
#12734692
04/28/18 10:27 PM
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Joined: Feb 2015
Posts: 836
Fish2222
OP
Pro Angler
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OP
Pro Angler
Joined: Feb 2015
Posts: 836 |
Ok....ignorant alert!
When I'm cruising at 25-35 mph....all good trimmed down tight.
If I want more speed I need to know tthe magic formula to keep bow up and rpm's right.
Any pointers?
150 hp
18' Fiberglass
"I only catch the ones that bite"
BassCat Sabre
Mercury EFI 175
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Re: Trim....speed.... best way?
[Re: Fish2222]
#12734695
04/28/18 10:31 PM
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Joined: Nov 2014
Posts: 23,362
SteezMacQueen
TFF Guru
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TFF Guru
Joined: Nov 2014
Posts: 23,362 |
Floor it! Trim up for faster, trim down for slower.
Eat. Sleep. Fish.
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Re: Trim....speed.... best way?
[Re: Fish2222]
#12734700
04/28/18 10:42 PM
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Joined: Oct 2006
Posts: 13,516
Ken A.
Groovy
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Groovy
Joined: Oct 2006
Posts: 13,516 |
Ok....ignorant alert!
When I'm cruising at 25-35 mph....all good trimmed down tight.
If I want more speed I need to know tthe magic formula to keep bow up and rpm's right.
Any pointers?
150 hp
18' Fiberglass Here are some pointers. Trim down all the way to take off. After the boat gets on plane, bump the trim up a little at a time. You will feel the bow begin to rise and the speed will increase without adding throttle. Trim up until the boats begins to porpoise. Then bump it down a couple times until the porpoise stops. Now you are set to go. The trim changes the attitude of the prop in the water and lifts the hull free so there is less wetted surface that creates drag on the water. Less drag equals more speed and more efficiency. So you will also burn less fuel if you are trimmed for optimum performance. If you are running WOT and you are trimming the motor up and you begin to notice the boat starts to chine walk, bump the down button a couple times to get it to settle down. Your boat should be capable of low to mid-60's if it is set up properly and has the right prop on it. Also watch the tach on the dash. Do not exceed 6,000 rpms as this could be too high for your motor. If you exceed 6,000 rpms, you need a higher pitch prop. They are rated in "diameter and inches of pitch." An 18' boat with a 150 probably has a 21" to 23" pitch prop. A good rule of thrumb is the lower the pro pitch, the better the holeshot but it costs you speed on topend. The higher pitch props are typically slower out of the hole but faster on the topend.
Last edited by Ken A.; 04/28/18 10:46 PM.
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Re: Trim....speed.... best way?
[Re: Ken A.]
#12734788
04/29/18 12:11 AM
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Joined: Nov 2014
Posts: 23,362
SteezMacQueen
TFF Guru
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TFF Guru
Joined: Nov 2014
Posts: 23,362 |
Ok....ignorant alert!
When I'm cruising at 25-35 mph....all good trimmed down tight.
If I want more speed I need to know tthe magic formula to keep bow up and rpm's right.
Any pointers?
150 hp
18' Fiberglass Here are some pointers. Trim down all the way to take off. After the boat gets on plane, bump the trim up a little at a time. You will feel the bow begin to rise and the speed will increase without adding throttle. Trim up until the boats begins to porpoise. Then bump it down a couple times until the porpoise stops. Now you are set to go. The trim changes the attitude of the prop in the water and lifts the hull free so there is less wetted surface that creates drag on the water. Less drag equals more speed and more efficiency. So you will also burn less fuel if you are trimmed for optimum performance. If you are running WOT and you are trimming the motor up and you begin to notice the boat starts to chine walk, bump the down button a couple times to get it to settle down. Your boat should be capable of low to mid-60's if it is set up properly and has the right prop on it. Also watch the tach on the dash. Do not exceed 6,000 rpms as this could be too high for your motor. If you exceed 6,000 rpms, you need a higher pitch prop. They are rated in "diameter and inches of pitch." An 18' boat with a 150 probably has a 21" to 23" pitch prop. A good rule of thrumb is the lower the pro pitch, the better the holeshot but it costs you speed on topend. The higher pitch props are typically slower out of the hole but faster on the topend. That's what I said! .....well.....sort of.
Eat. Sleep. Fish.
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Re: Trim....speed.... best way?
[Re: SteezMacQueen]
#12735098
04/29/18 04:40 AM
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Joined: Aug 2016
Posts: 1,476
T-racer @ Mallard Marine
Extreme Angler
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Extreme Angler
Joined: Aug 2016
Posts: 1,476 |
Ok....ignorant alert!
When I'm cruising at 25-35 mph....all good trimmed down tight.
If I want more speed I need to know tthe magic formula to keep bow up and rpm's right.
Any pointers?
150 hp
18' Fiberglass Here are some pointers. Trim down all the way to take off. After the boat gets on plane, bump the trim up a little at a time. You will feel the bow begin to rise and the speed will increase without adding throttle. Trim up until the boats begins to porpoise. Then bump it down a couple times until the porpoise stops. Now you are set to go. The trim changes the attitude of the prop in the water and lifts the hull free so there is less wetted surface that creates drag on the water. Less drag equals more speed and more efficiency. So you will also burn less fuel if you are trimmed for optimum performance. If you are running WOT and you are trimming the motor up and you begin to notice the boat starts to chine walk, bump the down button a couple times to get it to settle down. Your boat should be capable of low to mid-60's if it is set up properly and has the right prop on it. Also watch the tach on the dash. Do not exceed 6,000 rpms as this could be too high for your motor. If you exceed 6,000 rpms, you need a higher pitch prop. They are rated in "diameter and inches of pitch." An 18' boat with a 150 probably has a 21" to 23" pitch prop. A good rule of thrumb is the lower the pro pitch, the better the holeshot but it costs you speed on topend. The higher pitch props are typically slower out of the hole but faster on the topend. That's what I said! .....well.....sort of. LOL right idea
Mallard Marine Nacogdoches, Tx
936-225-3244 - Authorized Sales/Service
Mercury Outboards - Allison Boats
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Re: Trim....speed.... best way?
[Re: Fish2222]
#12735378
04/29/18 03:24 PM
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Joined: Nov 2008
Posts: 6,182
coachallentca
TFF Celebrity
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TFF Celebrity
Joined: Nov 2008
Posts: 6,182 |
watch your water pressure when trimming. If you go to high your water pressure will drop to low and that would not be good.
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Re: Trim....speed.... best way?
[Re: Fish2222]
#12735385
04/29/18 03:31 PM
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Joined: Jun 2008
Posts: 3,334
Hog Jaw
TFF Team Angler
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TFF Team Angler
Joined: Jun 2008
Posts: 3,334 |
I watch the nose of the boat , listen to motor , feel of the steer wheel .
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Re: Trim....speed.... best way?
[Re: T-racer @ Mallard Marine]
#12735969
04/30/18 02:09 AM
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Joined: Oct 2006
Posts: 13,516
Ken A.
Groovy
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Groovy
Joined: Oct 2006
Posts: 13,516 |
Ok....ignorant alert!
When I'm cruising at 25-35 mph....all good trimmed down tight.
If I want more speed I need to know tthe magic formula to keep bow up and rpm's right.
Any pointers?
150 hp
18' Fiberglass Here are some pointers. Trim down all the way to take off. After the boat gets on plane, bump the trim up a little at a time. You will feel the bow begin to rise and the speed will increase without adding throttle. Trim up until the boats begins to porpoise. Then bump it down a couple times until the porpoise stops. Now you are set to go. The trim changes the attitude of the prop in the water and lifts the hull free so there is less wetted surface that creates drag on the water. Less drag equals more speed and more efficiency. So you will also burn less fuel if you are trimmed for optimum performance. If you are running WOT and you are trimming the motor up and you begin to notice the boat starts to chine walk, bump the down button a couple times to get it to settle down. Your boat should be capable of low to mid-60's if it is set up properly and has the right prop on it. Also watch the tach on the dash. Do not exceed 6,000 rpms as this could be too high for your motor. If you exceed 6,000 rpms, you need a higher pitch prop. They are rated in "diameter and inches of pitch." An 18' boat with a 150 probably has a 21" to 23" pitch prop. A good rule of thrumb is the lower the pro pitch, the better the holeshot but it costs you speed on topend. The higher pitch props are typically slower out of the hole but faster on the topend. That's what I said! .....well.....sort of. LOL right idea 
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Re: Trim....speed.... best way?
[Re: Fish2222]
#12736269
04/30/18 12:57 PM
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Joined: Oct 2016
Posts: 231
FlatBack4
Outdoorsman
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Outdoorsman
Joined: Oct 2016
Posts: 231 |
Well, you could follow the instructions provided by all the engineer-types above, or just full throttle out of the hole, when you're on plane, trim up until you stop seeing water spray out of the corner of your eye. If you start porpoising (front-end bouncing), trim it down until the porpoising stops.
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Re: Trim....speed.... best way?
[Re: FlatBack4]
#12736300
04/30/18 01:12 PM
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Joined: Oct 2006
Posts: 13,516
Ken A.
Groovy
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Groovy
Joined: Oct 2006
Posts: 13,516 |
Well, you could follow the instructions provided by all the engineer-types above, or just full throttle out of the hole, when you're on plane, trim up until you stop seeing water spray out of the corner of your eye. If you start porpoising (front-end bouncing), trim it down until the porpoising stops.
I'm about the furthest thing from an Engunear you ever met. After owning 28 boats since 1974, I have been there/done that a fair amount. 
Last edited by Ken A.; 04/30/18 01:13 PM.
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Re: Trim....speed.... best way?
[Re: Ken A.]
#12736350
04/30/18 01:43 PM
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Joined: Oct 2016
Posts: 231
FlatBack4
Outdoorsman
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Outdoorsman
Joined: Oct 2016
Posts: 231 |
Well, you could follow the instructions provided by all the engineer-types above, or just full throttle out of the hole, when you're on plane, trim up until you stop seeing water spray out of the corner of your eye. If you start porpoising (front-end bouncing), trim it down until the porpoising stops.
I'm about the furthest thing from an Engunear you ever met. After owning 28 boats since 1974, I have been there/done that a fair amount. Actually, I am an engineer-type. My comment above was done completely tongue-in-cheek.
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Re: Trim....speed.... best way?
[Re: Fish2222]
#12736424
04/30/18 02:27 PM
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Joined: Aug 2006
Posts: 6,959
Sinkey
Tidy Scoop
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Tidy Scoop
Joined: Aug 2006
Posts: 6,959 |
I start lifting it as soon as she's out of the hole!
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Re: Trim....speed.... best way?
[Re: FlatBack4]
#12736484
04/30/18 03:06 PM
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Joined: Oct 2006
Posts: 13,516
Ken A.
Groovy
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Groovy
Joined: Oct 2006
Posts: 13,516 |
Well, you could follow the instructions provided by all the engineer-types above, or just full throttle out of the hole, when you're on plane, trim up until you stop seeing water spray out of the corner of your eye. If you start porpoising (front-end bouncing), trim it down until the porpoising stops.
I'm about the furthest thing from an Engunear you ever met. After owning 28 boats since 1974, I have been there/done that a fair amount. Actually, I am an engineer-type. My comment above was done completely tongue-in-cheek. You didn't use the little winky face emoji! 
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