Go Back  PPRuNe Forums > Flight Deck Forums > Tech Log
Reload this Page >

330/340 T/O Pitch Response

Tech Log The very best in practical technical discussion on the web

330/340 T/O Pitch Response

Old 24th Sep 2000, 21:20
  #1 (permalink)  
Posts: n/a
Question 330/340 T/O Pitch Response

Was wondering if anyone has any ideas why the 340/330 nose leaps skyward at higher (i.e. 6 or 7 units) pitch settings, and not so at the other end of the band?
When you think about it in relation to GWCG position, and rudder/wheel arms, it doesn`t make sense... or does it?
Old 25th Sep 2000, 07:25
  #2 (permalink)  
Join Date: Aug 1998
Location: Ex-pat Aussie in the UK
Posts: 5,792
Received 112 Likes on 54 Posts

As the angle of attack increases on a wing, the centre of pressure moves forward. On wide chord wings this results in a pitch up.

On fighter aircraft with very wide wings in relation to the body this pitch up tendency can exceed the elevator authority.

I have seen video of fighter takeoffs where this has happened, and the only option was to eject.
Checkboard is offline  
Old 25th Sep 2000, 08:36
  #3 (permalink)  
Posts: n/a

Thanks for the answer. I was thinking more in terms of the initial rate of rotation (pitch change) as opposed to any wing reaction.
Whilst I appreciate that the horiz. stab. is ititially set at a higher AoA (albiet -ive), and therefore will give a greater response at the initial application or rotation force, I thought this would have been more than offset by the CG position.
Also wonder if the new buses 340-500, A3xx etc, will take of in ground mode (direct law), or will have some pitch damping. It is scarey enough doing three weeks long haul on the 340, then a 330 jolly to realise the variences. Surely they wouldn`t be able to MFF the new derivatives when they really don`t fly similarly at the most critical phase of flight.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.