Jump to content

Recommended Posts

Not too many visitors here these days, but I'll give it a go :-) ...

Is there a way to use the LVL CHG option in XP11? If I engage it to descend from cruise altitude, the aircraft more or less falls from the sky - it is descending at 6000ft/min (or more: that's as high as the gauge shows) within five seconds. Even if I reduce the SPD value first, the descent rate is basically 'plummet'; and of course, overspeed quickly follows. I always have to resort to engaging and setting V/S to descend. 

Thanks.

 

Edited by martinlest
Link to comment
Share on other sites

  • 2 months later...

Hi Jan, 

I don't have XP12 since my computer can't handle it but I have always enjoyed flying your -300 in XP11. I recently got employed by a -300 operator so I now have the pleasure of flying the real thing! Beautiful plane to fly, I'm sure you have fond memories. 

To be fair to the original poster, I too had the same issue with LVL CHG in XP11. It would aggressively trim nose down to 6000fpm+ when commanded from cruise altitude -  Exactly how they are describing it. I doubt it is user error since I have the same issue.
I've noticed in the real bird LVL CHG can be a little sluggish at times but nothing to this extent. 

Might be worth looking into? Maybe it's a plugin conflict or something?

Just thought I would give my two cents. 

Cheers

  • Like 1
Link to comment
Share on other sites

2 hours ago, Aaron737 said:

Hi Jan, 

I don't have XP12 since my computer can't handle it but I have always enjoyed flying your -300 in XP11. I recently got employed by a -300 operator so I now have the pleasure of flying the real thing! Beautiful plane to fly, I'm sure you have fond memories. 

To be fair to the original poster, I too had the same issue with LVL CHG in XP11. It would aggressively trim nose down to 6000fpm+ when commanded from cruise altitude -  Exactly how they are describing it. I doubt it is user error since I have the same issue.
I've noticed in the real bird LVL CHG can be a little sluggish at times but nothing to this extent. 

Might be worth looking into? Maybe it's a plugin conflict or something?

Just thought I would give my two cents. 

Cheers

Can you provide a video of this since you've decided to join the topic? We haven't seen or had this widely reported before.

Link to comment
Share on other sites

What I believe happens is that people engage the LVL change while in MACH mode. This will make the speed control chase the set Mach number, and since the indicated speed rises rapidly for the same mach number in a descent (as temperature gets warmer and the speed of sound increases as a consequence), the plane will pitch down rapidly to achieve the necessary acceleration. If you disregard the automatic reversion to indicated speed (by setting the MACH mode again after it reverts to SPEED in the descent, for example), you can actually overspeed the aircraft easily, as at some point the set Mach number will exceed the VMO of the aircraft.

Descent speeds in excess of 5000 feet per minute in LVL CHG while in Mach mode is something I have observed regularly in the real aircraft, especially when paired with a decrease in headwind in the descent.

PS: Many pilots did not use FL CHG for the initial part of the descent for this very reason, rather using V/S to initiate a shallow(er) descent until the speed reference could be switched over to IAS and the FL CHG would work more stable.

Edited by Litjan
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...