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Permatrims: My 2 cents
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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
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PostPosted: Wed Dec 29, 2021 1:03 pm    Post subject: Reply with quote

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
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PostPosted: Wed Dec 29, 2021 1:57 pm    Post subject: Reply with quote

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.

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Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
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ssobol



Joined: 27 Oct 2012
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City/Region: SW Michigan
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C-Dory Year: 2008
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PostPosted: Wed Dec 29, 2021 2:57 pm    Post subject: Reply with quote

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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