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Jan 23rd, 2013
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Boat porpoises at wot #12471674
10/19/17 10:37 PM
10/19/17 10:37 PM
Joined: Jul 2017
Posts: 175
Cedar Creek Lake
M
Monkeypuncher Offline OP
Outdoorsman
Monkeypuncher  Offline OP
Outdoorsman
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Joined: Jul 2017
Posts: 175
Cedar Creek Lake
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.

Re: Boat porpoises at wot [Re: Monkeypuncher] #12471676
10/19/17 10:40 PM
10/19/17 10:40 PM
Joined: Sep 2003
Posts: 4,394
underwater
Bruce's Guide Service Online content
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Bruce's Guide Service  Online Content
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Joined: Sep 2003
Posts: 4,394
underwater
what the prop set at. You need to try and set it at 3.5 below pad.


Bruce's Sprinkler Repair
817-798-7246
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Re: Boat porpoises at wot [Re: Monkeypuncher] #12471683
10/19/17 10:48 PM
10/19/17 10:48 PM
Joined: Jul 2017
Posts: 175
Cedar Creek Lake
M
Monkeypuncher Offline OP
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Monkeypuncher  Offline OP
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Joined: Jul 2017
Posts: 175
Cedar Creek Lake
The dealer set it at the bottom of the pad, I'll try lowering it. Manual jackplate.

Re: Boat porpoises at wot [Re: Monkeypuncher] #12471706
10/19/17 11:08 PM
10/19/17 11:08 PM
Joined: Sep 2003
Posts: 4,394
underwater
Bruce's Guide Service Online content
TFF Team Angler
Bruce's Guide Service  Online Content
TFF Team Angler

Joined: Sep 2003
Posts: 4,394
underwater


Bruce's Sprinkler Repair
817-798-7246
50 years experience
State Licensed Irrigation
LI0017483


Fishing Texas lakes one at a time






Re: Boat porpoises at wot [Re: Monkeypuncher] #12471730
10/19/17 11:30 PM
10/19/17 11:30 PM
Joined: Jan 2005
Posts: 6,054
Seadrift TX
P
Pat Goff Offline
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Pat Goff  Offline
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Joined: Jan 2005
Posts: 6,054
Seadrift TX
Porpoising on a bass hull usually is caused by the prop losing its grip at the current trim angle.

You didn’t say what prop you’re running so that would help.

If it’s 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
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