# Homework Help: Question on longitudinal static stability of an aircraft

1. Aug 30, 2007

### bourne

wat will be the longitudinal static stability of an aircraft with a larger wing to a smaller wing?

2. Aug 30, 2007

### Staff: Mentor

Thread moved to Homework Help. Please take care to post homework/coursework questions in the Homework Help forums, and not in the general technical forums.

And you must show some of your work in order for us to provide tutorial help. What can you tell us about longitudinal stability? What effects would different shape and size wings have?

3. Aug 30, 2007

### Astronuc

Staff Emeritus
Is one expecting a qualitative or quantitative answer.

The larger wing has greater lift for given forward velocity. Then think about the response to perturbations in fluid properties.

Also, the moment of inertia increases with size. What effect does this have on pitch (longitudinal stability) or yaw (directional stability)?

FYI - http://dscb.larc.nasa.gov/Introduction/Controls/index.htm

See also - MIT, Aeronautics and Astronautics, 16.333 Aircraft Stability and Control, Fall 2004 -
http://ocw.mit.edu/OcwWeb/Aeronautics-and-Astronautics/16-333Fall-2004/CourseHome/index.htm [Broken]

Moment of inertia calculations:
http://blue.utb.edu/tjayp/Courses/PHYS2425F2000/Moment.html
https://www.physicsforums.com/archive/index.php/t-57119.html
http://hypertextbook.com/physics/mechanics/rotational-inertia/ [Broken]
http://em-ntserver.unl.edu/negahban/em223/note19/ex2/ex2.htm [Broken]

Last edited by a moderator: May 3, 2017
4. Aug 31, 2007

### bourne

yup. m sorry. i'll surely do tat next time onwards.