Volvo Penta Trim Questions

FluffyChicken

Petty Officer 2nd Class
Joined
Mar 29, 2007
Messages
167
Hello,

5.0GXI with an SX-M outdrive in case it matters. To be completely honest, even with my other boats in the past, I never really paid too much attention to my trim. Nose all the way down, get on plane as fast as possible and then I only bump the nose up a bit after getting on plane just mainly because this VP drive has a bit of a "wum wum wum" once I get up to speed and trimming up a tad gets rid of it. I do want to start playing more with the trim and working on top speed and better fuel economy for the occasional long trips. I read the manual and a lot of these trim gauges are different. Are the double dashed lines (red arrow) in the middle representing the maximum I can trim while under power or are they representing what should be a moderate trim level for cruising? I honestly think my boat in particular would porpoise into oblivion if I ever ran it at the double dashes at a cruising speed. Ive personally never taken it above the green arrow in the photo while cruising the lake, and only take it up to the double dash when I get near the shallow spot in our channel and my rpms are closer to 1000 at that point. Also assuming I should never obviously have the engine on near the purple arrow. It's odd, my old boat had two different trim switches, one on the stick to use while driving and the other against the sidewall for getting it all the way up when trailering. This Regal only has one on the stick and its full control.
Thanks
 

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jimmbo

Supreme Mariner
Joined
May 24, 2004
Messages
13,446
I rarely look at the Trim Gauge, when trimming. I use my ears and the Seat of my Pants. I trim up until the Boat begins to Porpoise for any given Speed, then trim a Tad in. At higher speeds, 50+, I keep an eye on the Water Pressure Gauge, and my Ears tuned for the Sound of the Prop losing Bite, again trimming in a Tad
 

FluffyChicken

Petty Officer 2nd Class
Joined
Mar 29, 2007
Messages
167
I rarely look at the Trim Gauge, when trimming. I use my ears and the Seat of my Pants. I trim up until the Boat begins to Porpoise for any given Speed, then trim a Tad in. At higher speeds, 50+, I keep an eye on the Water Pressure Gauge, and my Ears tuned for the Sound of the Prop losing Bite, again trimming in a Tad
Unfortunately no water pressure gauge on my boat but I definitely understand. Appreciate it.
 
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