ME 330 PS10 Solutions Fall 2010

ME 330 PS10 Solutions Fall 2010 - Problem Set #10, Problem...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Problem Set #10, Problem #1 Given: A NACA 23015 airfoil with a chord length L of 1ft and width w of 4ft and installed on the rear deck lid of a Honda Civic. Find: a) At 75mph, what is the ratio of downward force produced by the spoiler to the vehicles curb weight (about 2,300lbs)? b) At what highway speed with the spoiler produce 1% of the vehicle’s curb weight? c) At what highway speed will the spoiler produce 1% of the vehicle’s curb weight if it is installed with and angle of attack of -12 o ? d) Based on the location of the spoiler (about 3” above the trunk), will the values predicted above over or under estimate the downward force? Why? Assumptions: Steady state, uniform free stream Analysis: This is a basic lift and drag problem for a common airfoil that requires use of tabulated data and the definitions of the lift and drag coefficient 2 2 3 1 2 75 4 0.1 1.23 Downward L P P L FC V Vm p h AL w f t C kg m ρ = = == = A b s 25.7 ,5.8 Downward FN l = C L data for this airfoil was taken from Figure 9.17 [Fox, Pritchard, McDonald,
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 10

ME 330 PS10 Solutions Fall 2010 - Problem Set #10, Problem...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online