×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

NACA symmetrical foils - How do I find the point of balance ?

NACA symmetrical foils - How do I find the point of balance ?

NACA symmetrical foils - How do I find the point of balance ?

(OP)
I'm designing a T Foil rudder to go on the bottom of an existing catamaran. I would like to include an engagement/disengagement mechanism that can be used in motion. To simplify and reduce weight in the control I'd like to position the pivot slightly ahead of the point of balance.

Is there a general rule for positioning this ? Does it move with AOA ? In use they will be set at rest at 0°.

I'm likely to use 0008 to 0012 foils.

Thanks
Dave

RE: NACA symmetrical foils - How do I find the point of balance ?

Yes there is a general rule. You can find it in the airfoil plots that VeryMadMac linked you to.
The standard reference point for the pitching moment is 0.25*chord, called the "quarter-chord".
The negative moment implies the actual "aerodynamic center" is forward of the quarter-chord point. The rest is just a balance of forces.

www.sparweb.ca

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close