I was going back over my notes and through some texts for review, when i noticed in From the Ground Up, it says the horizontal stabilizer provides longitudinal stability. I always thought it controlled your lateral stability, as one of my instructors even told me.
Just wanted to get some opinions.....
Horizontal stabilizer
Moderators: Right Seat Captain, lilfssister, North Shore, sky's the limit, sepia, Sulako
Horizontal stabilizer
The average pilot, despite the somewhat swaggering exterior, is very much capable of such feelings as love, affection, intimacy and caring.
These feelings just don't involve anyone else.
These feelings just don't involve anyone else.
Re: Horizontal stabilizer
The book is right. Elevator doesn't control you laterally. Things such as dihedral, swept wings, keel effect do. Elevator and c of g effect longitudinal stability. Rudder/fin directionally.
-
FlaplessDork
- Rank 7
- Posts: 605
- Joined: Sun May 25, 2008 9:50 am
- Location: British Columbia
Re: Horizontal stabilizer
Center of Gravity being forward of the center pressure cause the airplane to be a lawn dart without a horizontal stab. With the Horizontal Stab this keeps the longitudinal axis "stay put" during cruise also known as Longitudinal Stability. Your instructor is confused with the "Movement" around the lateral axis called pitch but the axis doesn't move. Ask your self what keeps the axis "stay put" and you have the design feature that keeps that axis stable.
Re: Horizontal stabilizer
I hope he didnt. It is most likely you dont remember. I hope thats what happened. The above two posters sum it up right!wingman1 wrote: I always thought it controlled your lateral stability, as one of my instructors even told me.
Just wanted to get some opinions.....
Never buy 1$ tickets
Re: Horizontal stabilizer
The stabilizer will provide longitudinal stability or pitch stability about the lateral axis, where dihedral is for lateral stability or roll stability about the longitudinal axis.
I think people get movement and stability mixed. Here is a summary:
Long Axis- runs nose through tail. Movement is roll, stability is pitch
Lateral Axis- runs wing tip to wing tip. movement is pitch, stability is roll.
Normal/vertical Axis- runs vertically down the airplane. Movement is yaw, stability is directional.
Make a mental picture of that.
T01
I think people get movement and stability mixed. Here is a summary:
Long Axis- runs nose through tail. Movement is roll, stability is pitch
Lateral Axis- runs wing tip to wing tip. movement is pitch, stability is roll.
Normal/vertical Axis- runs vertically down the airplane. Movement is yaw, stability is directional.
Make a mental picture of that.
T01
Timing is everything.
Re: Horizontal stabilizer
Remember Axies and Stability are two different things.
The movement, pitch, is about the aircrafts lateral axis / the cg together with the horizontal stabilizer provide longitudinal stability. Think of the longitudinal axis and how the plane rolls about that axis right? but isn't this axis run the length of the airplane? so the stability of this so called "axis" would be controlled by that stab.
Same thing with lateral stability, the wings provide that stability.
The movement, pitch, is about the aircrafts lateral axis / the cg together with the horizontal stabilizer provide longitudinal stability. Think of the longitudinal axis and how the plane rolls about that axis right? but isn't this axis run the length of the airplane? so the stability of this so called "axis" would be controlled by that stab.
Same thing with lateral stability, the wings provide that stability.
