1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: The question about pitching moment:

  1. Jan 7, 2010 #1
    1. The problem statement, all variables and given/known data
    The centre of pressure for a prototype vehicle under development is found to be 0.1m aft (in the horizontal plane) and 0.2m above (in the vertical plane) from the centre of gravity. The vehicle has a front cross section of 2.1m2 with current predictions of lift and drag coefficients of 0.15 and 0.4 respectively. Air density is 1.2kg/m3. For a cruising speed of 50mph:

    Q1.Calculate the aerodynamic pitching moment (you may assume 1mph = 0.447m/s).

    Q2.Does the vehicle pitch nose up or down?

    Q3.Calculate the aerodynamic pitching moment coefficient assuming a wheelbase of 2.3m.

    2. Relevant equations

    Lift = 0.5 x ρ x v² x S x Cl
    Drag = 0.5 x ρ x v² x S x Cd

    Pitching moment = 0.5 x 0.5 x ρ x v² x S x Cp x l
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted