×
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!
  • Students Click Here

*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

Jobs

Required Tractive Force

Required Tractive Force

Required Tractive Force

(OP)
This may be too vague a question, but here goes:

I have to get a 420 tonne (GVW Load & trailer) load up a 13% grade. How much tractive force would the tractor unit need to have?

Not much I know, but that's all the information I have for now.

RE: Required Tractive Force

Draw yourself a simple right triangle with the slope that you have to pull as the angle opposite the short side.  The truck is shown as a weight and the rest is simple trigonometry.  Once you determine the force at that angle, then you need to determine the coefficient of friction of the drivers and figure the weight you will have to have on those axles (and maybe how many axles will be required as drivers.)

rmw

RE: Required Tractive Force

(OP)
While I appreciate your taking the time to answer, you say "Once you determine the force at that angle" and "then you need to determine the coefficient of friction"
If I know how to do that, I wouldn't have asked the question.

Anyway, thanks for your time, I got my answer elsewhere...

RE: Required Tractive Force

Use better brush up on Trig 101

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!


Resources