Quiz: Airspeed, Airfoils, Lift, and Drag
Question 12.5 pts
An aircraft weighs 604,723 pounds and has 76% of its weight on the main
(braking) wheels. If the coefficient of friction is 0.3, what is the braking force
on the airplane?
604723 x .76 = 459589.48
459589.48 x .3 = 137876.844 lbs
Question 22.5 pts
An airplane weighs 49,276 lbs and is flying at 6,000 ft altitude and an
airspeed of 145 fps. Find the kinetic energy in ft-lbs.
49276lbs/32.2fps(sq) = 1530 slugs
.5 x 1530 x 145(sq) =
765 x 21025 = 16,084,125 ft-lbs
Question 32.5 pts
An aircraft is in a steady climb, at an airspeed of 213 knots, and the flight
path makes a positive 42 degree angle with the horizontal. Find the Rate of
Climb, in feet per minute.
Rate of climb = airspeed sin(angle)
213 sin(42) = on phone type 42 (press sin) X 213 =142.52 Unit?
60.056847knots to fpm
Question 42.5 pts
An aircraft is in a steady climb, at an airspeed of 216 knots, and the flight
path makes a 24 degree angle with the horizontal. Find the Groundspeed to
two decimal places.
197.33 knots
Question 52.5 pts
A 63,383 lb aircraft has a ( value of 8.2; find its minimum drag.L/D)max
7729.63
Question 62.5 pts
An airplane weighs 59,870 lbs and is flying at 9,960 ft altitude and an
airspeed of 588 fps. Find the total energy.
TE=PE+KE
PE=weight x height… 59870 x 9960 = 596,305,200 ft-lbs
KE= ½mV(sq)… ½ (59870/32.2) 588(sq) = 929.658385 x 345,744 =
321423808 ft-lbs
Question 72.5 pts
An airplane is operating from an airfield that has a barometric pressure of
29.81 in. Hg and a runway temperature of 20C. Calculate the Density Ratio:
Pressure ratio= 29.81/29.92 = .9963
Temperature ratio= 20C = 527.67 Rankine / standard Rankine (518.67) =
527.67/518.67 = 1.017
Density Ratio= Pressure ratio/Density ratio = .9963/1.017 = 0.9796
Question 82.5 pts
An aircraft is traveling west at an airspeed of 203 knots and is experiencing a
crosswind of 28 knots from the north (90). Find the Groundspeed to two
decimal places.
201
Question 92.5 pts
