texasfishingforum.com logo
Main Menu
Advertisement
Affiliates
Advertisement
Newest Members
Barefootlender, Boop, falcon 10, Philipinlv, Maximus6!
119069 Registered Users
Top Posters(All Time)
hopalong 120,027
TexDawg 119,127
Bigbob_FTW 94,427
John175ā˜® 85,861
Pilothawk 83,240
Bob Davis 80,359
Mark Perry 71,844
JDavis7873® 67,416
Forum Statistics
Forums59
Topics1,036,031
Posts13,904,402
Members144,069
Most Online39,925
Dec 30th, 2023
Print Thread
Porpoising #14409635 07/01/22 02:26 PM
Joined: Feb 2011
Posts: 27,370
Der Vorsteher Offline OP
TFF Guru
OP Offline
TFF Guru
Joined: Feb 2011
Posts: 27,370
I have a Crestliner XF189 (Aluminum Boat). Obviously I am not super concerned speed but i would like to get a little more out of it. I know I probably have a little too much weight in the back with the batteries and talons. I can get 45mph out of it but it porpoises when I do. I added a fin but I don't see a difference. I thought I would try one just to see but it hasn't helped. I may and try for lithiums one day to help lessen the weight but that will be down the road. Would lowering the motor help with this? I don't know much about this. My previous two boats were bought used and already set up for maximum performance. Just wondering.


Team Wolfs
Re: Porpoising [Re: Der Vorsteher] #14409656 07/01/22 02:46 PM
Joined: Apr 2017
Posts: 11,690
tmd11111 Online Content
TFF Guru
Online Content
TFF Guru
Joined: Apr 2017
Posts: 11,690
Play with motor hight first, don't be suprised if raising the motor help. The added weight of the talons makes the transom sit deeper when running. Next option is a 4 blade prop to help with stern lift but generally will loose a few mph on top with one.

Re: Porpoising [Re: Der Vorsteher] #14409686 07/01/22 03:27 PM
Joined: Jan 2005
Posts: 16,104
P
Pat Goff Online Content
TFF Guru
Online Content
TFF Guru
P
Joined: Jan 2005
Posts: 16,104
The usual cause of porpoising is the prop losing it's "bite" to the water, and it lets go. Raising the motor will typically make it worse, not better.

A few things to consider:
It's a iron boat, it's not designed to run like a fiberglass hull, it won't/can't lift because it's not designed to. So it's happy just running flatter to the water.

Aluminum hulls create a lot more disturbance in the water, your prop wants to run in clean, bubble free water, air is not your friend.

So, how do you stop the bounce?
As suggested a four blade prop is my first option, that will usually bring you into the happy zone. Powertech makes some outstanding four blades for exactly what you want.

Also as suggested, if that doesn't calm the beast, drop your motor until you find a happier place.

If THAT doesn't fix it, then you're dealing with a stubborn child and the attitude adjustment that will always cure it is some electric trim tabs.
[Linked Image]


Pat Goff
Seadrift TX
[Linked Image]
Re: Porpoising [Re: Der Vorsteher] #14409785 07/01/22 05:57 PM
Joined: Feb 2011
Posts: 27,370
Der Vorsteher Offline OP
TFF Guru
OP Offline
TFF Guru
Joined: Feb 2011
Posts: 27,370
I can get 45 but the porpoising starts at 40. Trimmed just right I am getting 38-39 without porpoising. It has a 3 blade power tech prop. Its dropped down to the next to last notch.


Team Wolfs
Re: Porpoising [Re: Der Vorsteher] #14410208 07/02/22 04:18 AM
Joined: Jan 2005
Posts: 16,104
P
Pat Goff Online Content
TFF Guru
Online Content
TFF Guru
P
Joined: Jan 2005
Posts: 16,104
Rule #1 on boat setup, take it too far and bring it back. If you don't know what too low or too high is, you'll never know what just right is.


Pat Goff
Seadrift TX
[Linked Image]
Re: Porpoising [Re: Der Vorsteher] #14410298 07/02/22 12:32 PM
Joined: Mar 2006
Posts: 2,728
B
basscaster46 Online Content
Extreme Angler
Online Content
Extreme Angler
B
Joined: Mar 2006
Posts: 2,728
Trim tabs will work best


I got all day Iā€™m retired
Previous Thread
Index
Next Thread

© 1998-2022 OUTDOOR SITES NETWORK all rights reserved USA and Worldwide
Powered by UBB.threads™ PHP Forum Software 7.7.3