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 Boat porpoises at wot
#12471674
10/19/17 10:37 PM
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Joined: Jul 2017
Posts: 175
Monkeypuncher
OP
Outdoorsman
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OP
Outdoorsman
Joined: Jul 2017
Posts: 175 |
I have an excel 2172 with a Yamaha 150lb. Boat porpoises above 4100 rpms, if I put 100lbs of weight in the bow, it runs fine. I am looking for a permanent solution. Raise or lower engine? Change prop? Any help is appreciated.
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Re: Boat porpoises at wot
[Re: Monkeypuncher]
#12471676
10/19/17 10:40 PM
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Joined: Sep 2003
Posts: 5,519
Bruce's
TFF Celebrity
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TFF Celebrity
Joined: Sep 2003
Posts: 5,519 |
what the prop set at. You need to try and set it at 3.5 below pad.
Bruce's Sprinkler Repair
817-798-7246
52 years experience
State Licensed Irrigation
LI0017483
Fishing Texas lakes one at a time
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Re: Boat porpoises at wot
[Re: Monkeypuncher]
#12471683
10/19/17 10:48 PM
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Joined: Jul 2017
Posts: 175
Monkeypuncher
OP
Outdoorsman
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OP
Outdoorsman
Joined: Jul 2017
Posts: 175 |
The dealer set it at the bottom of the pad, I'll try lowering it. Manual jackplate.
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Re: Boat porpoises at wot
[Re: Monkeypuncher]
#12471706
10/19/17 11:08 PM
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Joined: Sep 2003
Posts: 5,519
Bruce's
TFF Celebrity
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TFF Celebrity
Joined: Sep 2003
Posts: 5,519 |
Bruce's Sprinkler Repair
817-798-7246
52 years experience
State Licensed Irrigation
LI0017483
Fishing Texas lakes one at a time
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Re: Boat porpoises at wot
[Re: Monkeypuncher]
#12471730
10/19/17 11:30 PM
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Joined: Jan 2005
Posts: 16,929
Pat Goff
TFF Guru
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TFF Guru
Joined: Jan 2005
Posts: 16,929 |
Porpoising on a bass hull usually is caused by the prop losing its grip at the current trim angle.
You didnt say what prop youre running so that would help.
If its a decent wheel than usually lowering a bit will cure the bounces.
After that it starts getting a little more detailed.
Pat Goff Seadrift TX ![[Linked Image]](https://i.ibb.co/X48Kbbq/scooter-shallow.jpg)
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