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Trim too sensitive?


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Posted

It's probably me and maybe that's exactly how trim works in real F-15E... but I'm unable to trim the aircraft pitch properly - for level flight or selected descent rate at given speed - any single pitch trim change feels like it's too much.

I've compared it with F-86 (if it's any comparison) where one could go down with trimmed aircraft to the runway almost without having to touch the stick... not with F-15E.

I assume I could set then appropriate speed for given pitch setting, that would help me to preserve altitude or vertical speed but wouldn't that implicate I have only certains speeds I can pitch for?

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Posted

I dont think so. I use buttons for this on joystick HAT and can recive "near" stable flight. Maybe not "hands off" with trimming (for this you have autopilot), but looks realistic, nothing strange for me.

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Posted

Trim is supposed to weaken the forces on the stick. For perfect hands free flying use AP.

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Posted
2 hours ago, elewarr said:

It's probably me and maybe that's exactly how trim works in real F-15E... but I'm unable to trim the aircraft pitch properly - for level flight or selected descent rate at given speed - any single pitch trim change feels like it's too much.

I've compared it with F-86 (if it's any comparison) where one could go down with trimmed aircraft to the runway almost without having to touch the stick... not with F-15E.

I assume I could set then appropriate speed for given pitch setting, that would help me to preserve altitude or vertical speed but wouldn't that implicate I have only certains speeds I can pitch for?

Hands on Stick and Throttle at all times. The trim speed is fine.

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Posted

Thank you, I will try to train more. It's just, F-15E feels a little bit different than other aircrafts in this matter and I wasn't sure.

Posted (edited)

FYI in most cases the F-15E autotrims to maintain the current G force, not airspeed, e.g. if you're trimmed for 1.5 g you'll stay at 1.5 g, not at a stable airspeed.  The trim switch will change the set g-force.  Kind of like the Hornet and Viper, although I assume there are nuanced differences.

The only times you practically mess with the trim in normal flight is on takeoff when weird things happen to the nose after liftoff, and when the gear comes down for landing.  At that point, trim acts like how you'd expect conventionally, and you can trim for AOA or airspeed.

I'd also add that on go-arounds, after trimming to AOA 20, when the gear comes up the plane seems trimmed for a 2g climb.  That's not cool, and I'm not sure if that's expected behavior, so expect to spam the trim down button on a go-around...

Edited by jaylw314
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Posted
1 hour ago, jaylw314 said:

FYI in most cases the F-15E autotrims to maintain the current G force, not airspeed, e.g. if you're trimmed for 1.5 g you'll stay at 1.5 g, not at a stable airspeed.  The trim switch will change the set g-force.  Kind of like the Hornet and Viper, although I assume there are nuanced differences.

The only times you practically mess with the trim in normal flight is on takeoff when weird things happen to the nose after liftoff, and when the gear comes down for landing.  At that point, trim acts like how you'd expect conventionally, and you can trim for AOA or airspeed.

I'd also add that on go-arounds, after trimming to AOA 20, when the gear comes up the plane seems trimmed for a 2g climb.  That's not cool, and I'm not sure if that's expected behavior, so expect to spam the trim down button on a go-around...

 

Takeoff trim has to be nulled out manually as does any other trim you manually input.  The only alternative is the TO trim button which 0s out roll and yaw trim and max deflects to pitch up as far as the PTC will allow.  

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Posted
4 minutes ago, Rainmaker said:

Takeoff trim has to be nulled out manually as does any other trim you manually input.  The only alternative is the TO trim button which 0s out roll and yaw trim and max deflects to pitch up as far as the PTC will allow.  

Oooof.  That sounds like unpleasant aircraft design during a moment when pilot workload is high, but good to know 😬

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