16.100 Homework Assignment # 9
Due: Monday November 21, 9am
Reading Assignment
Anderson, 3
rd
edition: Chapter 19 (everything)
Problem 1
In this problem, you will develop an estimate for the friction drag on the trapezoidal wing of an F16C at
approach conditions.
We will assume the approach speed is 200 mph and take the air conditions as sea
level, standard day.
We will also consider a wind tunnel test of a 1/10 scale model of the F16C at 100
mph (assume the tunnel air conditions are also sealevel, standard day). The trapezoidal wing is the wing
extended to the centerline (i.e. the fuselage and the strake are not included).
The planform and
dimensions of the trapezoidal wing for the fullscale F16C are shown below:
c
r
b
c
t
where
31 ft,
16.2 ft, and
3.2 ft.
In the following estimates, we will modify the usual
approach for estimating skin friction drag based on a single mean value of
c
to include a laminar and a
turbulent boundary layer section each with its own value of
c
.
We will assume that the boundary layer
transitions at a Reynolds number based on x of 10
=
b
=
r
c
=
t
c
f
f
6
.
a) For the actual F16C at approach, estimate the skin friction drag coefficient accounting for both the
laminar and turbulent boundary layer effects.
Include a drawing that indicates the specific region on
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Fall '03
 willcox
 Dynamics, Aerodynamics, NACA, skin friction drag, turbulent boundary layer

Click to edit the document details