Question

Consider an infinite wing with a NACA 1412 airfoil section and a chord length of 1.5 ft. The wing is at an angle of attack of 5° in an airflow velocity of 170 ft/s at standard sea-level conditions. Calculate the lift, drag, and moment about the quarter-chord per unit span. Refer to the Appendix graphs given below for the standard values. (Round the final answers to two decimal places.)

1)The lift per unit span is _______lb.

2)The drag per unit span is _______lb.

3)The moment about the quarter-chord per unit span is _______lb.

Answer #1

The airfoil data in Appendix D were obtained in the NACA
two-dimensional Low Turbulence Pressure Tunnel at the NACA Langley
Memorial Laboratory. This facility went into operation in Spring
1941. The tunnel was especially designed for airfoil testing, with
a test section 3 ft wide and 7.5 ft high. The wing models spanned
the entire test section of width 3 ft, sso that the flow over the
model was essentially two-dimensional. The chord length of the
models was 2 ft....

A finite wing with an area of 2.0 ft2, an aspect
ratio of 7.0 and a span efficiency factor of 0.96 is mounted in a
wind tunnel where the test section flow velocity is 110 ft/s at
standard sea-level conditions. When the wing is pitched to a =
-20, no lift is measured. When the wing is pitched to a
= 10.00, a lift of 20 lbs is measured. Determine the
lift curve slope for the airfoil (i.e., the infinite...

A wing-body model is tested in a wind tunnel with a
flow of 100 m/s at standard sea-level conditions.
The wing area is 1.5 m2
and the mean aerodynamic chord length is 0.45 m.
Measurements of lift force, L, and moment about the center of
gravity, M CG are made using the wind tunnel force
balance.
B1(a) When the lift is zero, the moment about the center of gravity
is measured to be, MCG = −12.4 Nm .
At another...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 4 minutes ago

asked 17 minutes ago

asked 19 minutes ago

asked 33 minutes ago

asked 44 minutes ago

asked 48 minutes ago

asked 56 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago