Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Aircraft Rotation (The Design)  
User currently offlineRush744 From United Kingdom, joined Dec 2006, 11 posts, RR: 0
Posted (9 years 2 months 1 week 2 days 20 hours ago) and read 2946 times:

Hey guys i understand the basic concepts of aircraft rotation, there being enough tail force etc etc however what is the "Zero Lift Pitching Moment"? Its used in the aircraft rotation formula, In the formula it is known as M0 but does not suggest what a value could be, would it be the CofG? If not what and how could this be calculated? Diagrams have an arrow from the front of the wing  Confused

The formula for a/c rotation is:

Tmin = 1/x (yW - zLw-M0) = ½pV22S’C’L

(V22 is V Squared and V2)

Big version: Width: 557 Height: 298 File size: 12kb

T is downforce due to tail
x is the distance between location of rear undercarriage and line of action T
y is the distance between location of rear undercarriage and CG
z is the distance between location of rear undercarriage and wing lift Lw
M0 Zero lift pictching moment

I have values for T, x, y & z but am confused to what M0 is!

All help will be greatful  Smile

1 replies: All unread, jump to last
User currently offlineFredT From United Kingdom, joined Feb 2002, 2185 posts, RR: 26
Reply 1, posted (9 years 2 months 1 week 2 days 20 hours ago) and read 2939 times:

It's the pitching moment at the zero lift angle of attack, i e the angle of attack where there is no lift generated.

A moment applied to a rigid body is not applied to any specific point of the body. If you applied it through a fixed shaft (without providing a force at the attachment point of the shaft) the resut would be the same regardless of where the shaft was attached.

And yes, the resulting rotation will be about the center of mass of the rigid body.


I thought I was doing good trying to avoid those airport hotels... and look at me now.
Top Of Page
Forum Index

Reply To This Topic Aircraft Rotation (The Design)
No username? Sign up now!

Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)

Similar topics:More similar topics...
Blades Turning While Aircraft At The Gate... posted Sun Dec 4 2005 07:19:55 by Silver1SWA
Steering Aircraft On The Ground posted Tue Jun 15 2004 11:39:05 by Itsjustme
Safest Commercial Aircraft In The World posted Wed Nov 21 2001 01:44:27 by BOEING747400
What's The Most Dangerous Part Of Aircraft Testing posted Tue Mar 13 2007 04:08:09 by CoolGuy
Does The Ground Effect Apply To Large Aircraft? posted Thu Mar 8 2007 07:02:09 by CoolGuy
How Much Do All The Avonics Cost On An Aircraft? posted Mon Feb 26 2007 21:06:50 by CoolGuy
What Is This Around The Aircraft? posted Thu Feb 15 2007 02:44:25 by LoveASE
Help Needed With Part 139 Aircraft Design Groups posted Sat Feb 3 2007 22:04:55 by A342
What Is The Best Corporate Aircraft Forum? posted Sat Jan 6 2007 05:56:01 by Turbonytro
Design Your Low Cost Airlines Aircraft posted Fri Oct 20 2006 14:34:00 by Rom1

Sponsor Message:
Printer friendly format