How much trim should I use?

1

Hi there! I was wondering if anyone knows of any websites that have rate of climb/ decent in them. Simbrief unfortunately with the takeoff/ landing performances does not show this information. I have personally been using 0 trim on takeoff and landing but have come to the conclusion that my terrible takeoffs are somewhat to do with the trim. I’ve seen people use 10% but I knew it kinda depended on what aircraft, weight, speed etc. So if anyone has any websites, apps or charts for this info, it will certainly help alot. Thank you for reading! :D

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2

For takeoff, i use 20% trim for takeoff when using flaps 5, 10 on boeing or 1 on airbus. For landing, just use it like a real plane does, just as much so that you dont have to push or pull the yoke. Why is everyone asking the same question?

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3

Have you checked this thread for your takeoff profiles? Rate of climb is a different thing, mate, and you can use this website.

4

What are the main problems you’re having with takeoffs?

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5

I can only talk about for A380s and you will need to constantly trim the aircraft after departure to your cruising altitude. It also range from around 20-30 for takeoff depending on the weight, flaps config and vR speed.

6

This true for all airliners in IF.

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7

Right but adjustments on A380 is a tad more intense as it’s a very slippery aircraft and trim can actually affect your VS during climb and Same goes for descent.

8

You also need to monitor your climb and descent on the a380 compared to any other aircraft.

9

777s on the other hand doesn’t require constant trim inputs.

10

You have to be very careful with landing trim on smaller aircraft, because you can easily go too much nose-up and then have issues especially if you want to maintain a descent rate that’s 800fpm like I do. I tend to autopilot down to 200ft and then manual from there with 4 percent trim flaps 30 for the 737.

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11

It’s usually when I first lift of, I pitch up, realise its a lil’ too high of aoa, pitch down a little bit but then the aircraft just goes back down and slams into the runway.

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12

Ok thank you, the website and thread has everything I need.

13

If you’re flying the Spitfire 100% up trim 😈

14

Thanks for your description.

Just to be clear, I typically don’t use trim.

Having said that, trim is very important irl to remove the impossible-to-sustain “fighting” against the changing pitch forces for variations in load balance, speed, and configuration (changes in thrust, flaps and gear).

In IF this translates to changing the comfort range of angles for controlling with your device.

In a very real sense trim is a “comfort assist” control.

What this means is that you can control an aircraft completely without using trim (though when turning off AP, you want to be in trim to prevent runaway pitch), as long as you are comfortable with the pitch tilt range of your device.

To prevent over-pitching at takeoff (which can result in having to aggressively compensate with too much down pitch):

  1. make sure you are at an appropriate rotation speed (speed reduces the aggressiveness of the necessary pitch to attain lift-off)

  2. practice finding the pitch up pressure sweet spot by practicing “takeoff” in solo mode many times until you can get a feel for “how much and where”.

  3. first do the above many times with zero trim, so you get a feel for “how much is enough” so you develop a sense of control independent of trim (you can always add it later according to personal preference).

After leaving the runway, you will still need to adjust pitch as you accelerate, while the speed increase also changes the state of trim (which you can offset with trim if necessary).

TL;DR: Be near the correct rotation speed, and practice takeoffs many times on solo (first with zero trim).

15

how much on a Crj-200 for Trim

16

Hi, people presumably vary in their recommendations.

But I just went back to re-verify with the Crj-200 in solo mode: both takeoff and landing with no trim can be done smoothly with enough practice repetitions, assuming you also observe adequate speed control.

By all means use trim according to need, but the above exercise can possibly help with assessing how much trim might work best. Plus, it helps to improve one’s accuracy.