Trimming questions

[airdvr1227]

My trim on my rig has little or no effect while I'm on plane. Changing the trim setting might bring the bow up 5-7 degrees before performance begins to fall off. Other than getting the leg out of the way for trailering or in the shallows what is the real purpose? Why would I want to trim up?

 

[Boss Hawg]

Re: Trimming questions

My trim on my rig has little or no effect while I'm on plane. Changing the trim setting might bring the bow up 5-7 degrees before performance begins to fall off. Other than getting the leg out of the way for trailering or in the shallows what is the real purpose? Why would I want to trim up?

Your trim is for "fine tuning" while on plane - up or down depends on water conditions & speed
Your tilt is for the trailer thing

 

[airdvr1227]

Re: Trimming questions

Your trim is for "fine tuning" while on plane - up or down depends on water conditions & speed

I get that, but at least on my rig it doesn't seem to make all that much difference. I want the bow lowered to improve efficiency but raising the trim has so little affect I wonder why bother...just keep it trimmed all the way down.

 

[Mischief Managed]

Re: Trimming questions

You should see a substantial increase in speed as you trim up. Mine gains 5-6 MPH easily. Increase it in small increments at WOT until the speed peaks. Note the trim setting on the gauge. That's about as high as you'd ever want to trim up on plane. At lower speeds, you may see better results with slighly less trim.

 

[RickJ6956]

Re: Trimming questions

I want the bow lowered to improve efficiency...

Actually you want the bow to be slightly lifted on plane for improved efficiency.

Trimming the bow up will lift more of the entire boat out of the water, reducing drag. Less gas is used. If the engine had to plow the bow through the water, more drag would be introduced at the cost of more fuel consumption.

Generally, the best cruising speed vs efficiency is attained when you back off the throttle after it planes until it starts to fall off plane. Tap the throttle back up until it holds plane. Note the RPMs on the tach. Probably around 3,000.

Hit the bow up switch on the trim. You should see an increase in RPMs. Pull the throttle back until the tach reads the same RPMs. You have just saved more money in gasoline.

 

[airdvr1227]

Re: Trimming questions

That's what I was looking for...thanks. It seemed illogical that I would want the bow to come up but now it makes sense.