Incorrect Pitch Moment for flaps being deployed

[Goblin]

Yeah, it's in the release notes today :)

[streakeagle]

I will wait for the real release. I don't do open betas, not even 2.x to preview Nevada. I don't have the time or patience to intentionally work my way through more bugs that what is in the "final" release of any given 1.5x version. Other than that, I can't wait to see how the flight model behaves now.

[streakeagle]

I finally got to try the latest patch this morning.

With flaps and gear down, if you don't use the preflight trim, the aircraft does not jump off the runway anymore and if you try to neutralize the stick after liftoff, the aircraft will nose down. While greater experts than me can argue about the exact forces involved, I am seeing the behavior I would expect and setting the trim now serves a purpose.

 

I am calling this "fixed" :)

[spiddx]

Fixed? Nothing in your post indicates that the pitch moment due to flap retraction/extension has changed.

 

Well it has changed. Now upon flap extension the nose drops rather significantly instead of rising as it did before.

[streakeagle]

Flaps and gear down... need up trim or you have to pull back to hold pitch = nose down moment.

 

Not having the handy dandy chart that was later produced, a procedure that requires you to apply a generous amount of nose up trim prior to take-off indicates the need for trim. But as originally released, the aircraft naturally pitched up without any trim. It would just rotate and leap from the runway. This was specifically the problem I felt needed to be addressed.

 

Now, you have to either apply the trim specified by the preflight procedure, or manually hold the stick back by a similar amount, in compliance with the documented tendencies of the aircraft.

 

Put the gear and flaps up, and now such severe trim or stick pull is no longer required. The trim depends only on the center of pressure vs the center of gravity for the particular mach number/aircraft load.

 

You can now argue about how close it is or isn't to the exact real values that are partially defined in the chart posted in this thread and the verbal pilot anecdotes, but it is at least in the right direction and based on what I saw, even in the ball park of the correct magnitude.

 

Without better documentation than presently available, how can Belsimtek make it any more accurate? So, until I see some aspect that conflicts with published data, it sure seems fixed as well as it is ever going to be to me.

[gospadin]

FYI, the fix for pitch moment with flaps is in 2.0.4 patch notes