Is there a specified trim setting for any aircraft? For the 787 if I’m >MLW my trim is usually between 40%-50%, someone said I’m doing it wrongly. But then when I cap my trim at a certain percentage I still see the pink bar telling me that I should trim the excess pitch up forces more.
For the A380 I trim at 80% if I’m near MTOW, sometimes 100% trim isn’t enough if I’m doing an ultra long haul flight and it’s heavy.
You can keep your trim however you feel comfortable especially during takeoff and landing. I prefer a lot of trim in most aircraft because that’s what I’ve been accustomed too but others may like less trim. During cruise I do prefer to adjust until there is no more magenta visible.
I can’t say I have but with the CRJs and DC/MD aircraft I’ve found that those are aircraft I have more positive trim input when compared to other aircraft. I don’t believe I’ve ever trimmed any aircraft over 70% positive trim.
I use 30% at most for a heavy aircraft, if you’re cruising with negative trim you likely have the fpv over the pitch, which means your airspeed is too high. Trim is a setting for speed, it is basically auto-speed that changes your pitch to maintain speed. If you set a trim and add throttle it will maintain that speed whether it points you up or down to do so; granted it will have to level out by porpoising a bit. For example, takeoff trim on the C172 is trim for 80kts which is the climbout speed, so theoretically if you stabilize the aircraft it will climb out at the right speed by itself. It’s pretty interesting, I recently learned it while preparing for the FAA knowledge test. I suggest you check it out.
I was at M 0.73 on an A320 without the need for a negative trim. If I was at M 0.78 which is the cruising speed for the A320, I need to trim negative as the fpv is over the pitch, isn’t that odd?
I don’t really get how trim links with maintaining speed because when I takeoff 99.9% I’m not at the correct trim setting. To correct my trim setting when hand-flying my aircraft during climbout is something which I rarely do because it’s very difficult to hold my device stable with two hands and setting trim with my thumb, I may accidentally activate A/P or gear down. I’d love to trim on a real aircraft but sadly I’m unable to.