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daninPA
Joined: 16 Aug 2020
Posts: 140
City/Region: MOUNT JOY
State or Province: PA
C-Dory Year: 1994
C-Dory Model: 22 Cruiser
Vessel Name: NAVIRE
Photos: daninPA
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 Posted: Wed Dec 29, 2021 1:03 pm Post subject: |
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| pcg wrote: | | thataway wrote: | | As a person who feels both trim tabs and Permatrims are ideal, I would disagree that the permatrim does not help bring the bow up. My experience is that it does. |
I have experience with neither, but I thought the purpose of Permatrim was to lift the stern, i.e. bring the bow down.??? |
Permatrim (essentially an extension of the motor's anti-ventilation plate) reinforces the OB engine's angle (up or down).
https://www.permatrims.com/ |
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thataway
Joined: 02 Nov 2003
Posts: 19824
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
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| Posted: Wed Dec 29, 2021 1:57 pm Post subject: |
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| pcg wrote: | | thataway wrote: | | As a person who feels both trim tabs and Permatrims are ideal, I would disagree that the permatrim does not help bring the bow up. My experience is that it does. |
I have experience with neither, but I thought the purpose of Permatrim was to lift the stern, i.e. bring the bow down.??? |
That is true, but as you bring the motor up to neutral or above, it helps to direct the prop wash up. It is only acting on the upper part of the prop wash however.
_________________
Bob Austin
Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
KA6PKB
Home port: Pensacola FL |
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ssobol
Joined: 27 Oct 2012
Posts: 2891
City/Region: SW Michigan
State or Province: MI
C-Dory Year: 2008
C-Dory Model: 22 Cruiser
Vessel Name: SoBELLE
Photos: SoBelle
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| Posted: Wed Dec 29, 2021 2:57 pm Post subject: |
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| pcg wrote: | | thataway wrote: | | As a person who feels both trim tabs and Permatrims are ideal, I would disagree that the permatrim does not help bring the bow up. My experience is that it does. |
I have experience with neither, but I thought the purpose of Permatrim was to lift the stern, i.e. bring the bow down.??? |
The way trim tabs are installed they can only push the bow down because they are blanked by the hull in the bow up direction. The permatrim rides in more of a free stream and can give a bow up moment. However, if you install it per the directions (and your engine is at the correct height relative to the hull), the bow up moment will be less than the bow down moment.
I'm sure that different installations give more or less bow up control with the permatrim and won't be the same for all boats. Permatrims are not designed for bow up control, but in some cases it can happen. |
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