Contact US

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

Disc loading during autorotation

Disc loading during autorotation

Disc loading during autorotation

We are designing a large gyroplane and wish to be able to calculate the possible disc loading for large diameter rotors.

Where might we find tabulated data, or formulas for calculating disc loading during autorotation varying the diameter of the rotor?

Please contact Stan or Bryan by email at flymac@teleport.com

RE: Disc loading during autorotation

You will find the governing equations (ie Accurate to within 80%) for disk loading, and the affect of autorotation on disk loading in
Helicopter Performance Stability, and control.
by Prouty

RE: Disc loading during autorotation

Thrust / Disc area is your disc loading.

if you have say 25,000 lbs of static thrust, and disc area is 2261.978 sq/ft then your disc loading is:

11.052 lbs/Ft^2

RE: Disc loading during autorotation

My appologies, I know what your looking for, ill have a post shortly for it.

RE: Disc loading during autorotation

Ok, here is some information that may help you.

For approximations, your probably going to get sick and tired of hearing those terms....Approximate values....I can only say get used to it. Engineering is not absolute with anything other than close estimation to anything closer than 2% to 5%.

T/A ::: Disc loading. the :::<-- means "is relative to" normally you will see this in engineering books as an = sign but with one extra line underneath it, so it looks like an equals sign with three lines instead of two.

so for disc loading of w = T/A

T = 2Apvh^2
A disc area
p air density
vh = hover velocity squared.

vh = sqrt(w/2p)

now dont panic, this is for a hovering rotor, for calculating say for descent rates, us this equation.

vd = 1/2Vd + sqrt(1/4Vd^2 + (T/2Ap))

Now climb velocities and descent velocities are just interchanged by changing the signs. easy right?

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


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