Purchase Solution

Thrust to weight ratio and Weight Problems

Not what you're looking for?

Ask Custom Question

1) If a 22450lb (total gross weight) airplane develops 8160lbf thrust from each of its two engines and has a wing area of 312ft2 and wing-span of 53.5ft. And a empty weight of 11770lbf. Determine the thrust to weight ratio and the wing loading of this aircraft?

2) Consider an ordinary, helium-filled party balloon with a volume of 2.2ft3 . The lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. Using this
fact, Archimedes Principle can be derived, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. Assuming the balloon is at sea level, standard atmospheric conditions, calculate the maximum
weight that can be lifted by the balloon.

Note: the molecular weight of air is 28.8 and that helium is 4. What if the helium is replaced by hydrogen, molecular weight of 1?

Purchase this Solution
Solution Summary

The weight and thrust to weight ratios are calculated in the solution.

Solution Preview

Problem 1

If a 22450lb (total gross weight) airplane develops 8160lbf thrust from each
of its two engines and has a wing area of 312ft2 and wing-span of 53.5ft. And a
empty weight of 11770lbf. Determine the thrust to weight ratio and the wing loading
of this aircraft?

Solution:

The thrust to weight ratio can be computed by dividing the total thrust provided by both engines to the gross weight of the airplane:
T = 2*8160 = 16320 lbf (total thrust)
G = 22450 lb (total gross weight)
--> T/G = 16320/22450 = 0.727 (it is a dimensionless feature)

The wing loading will be computed in the same way, by dividing the total gross weight of the airplane to the wing area:
S = 312 ft2 (total wing area)
--> G/S = 22450/312 = 71.96 lb/ft2

Problem 2

Consider an ordinary, helium-filled party balloon with a ...

Purchase this Solution
Free BrainMass Quizzes
Architectural History

This quiz is intended to test the basics of History of Architecture- foundation for all architectural courses.

Air Pollution Control - Environmental Science

Working principle of ESP

View More Free Quizzes
Related BrainMass Solutions

  • torques due to the weight and thrust

    135179 torques due to the weight and thrust The drawing shows a jet engine suspended beneath the wing of an airplane. The weight W of the engine is 9600 N and acts as shown in the drawing.

  • Find rocket thrust, inteval between ignition and lift-off

    Initially, the thrust is less than rocket's weight. Hence, the rocket does not lift off immediately. As the fuel burns, rocket's weight decreases and as soon as the weight becomes less than the thrust, lift off takes place.

  • Archimedes principle

    ) Liquid 2 density ρ2 g/cc Area A The block is subjected to two forces as follows : i) weight mg acting downwards ii) upward thrust F As per Archimedes' principle, the upward thrust is equal to the weight of the

  • Simple Harmonic Motion of a Floating Object

    thrust = Adρg For equilibrium, upward thrust must be equal to the weight of the object.

  • Various Physics (Mechanics) Problems

    47399 Various Physics (Mechanics) Problems (See attached file for full problem description) --- 37. A block whose weight is 45.0 N rests on a horizontal table. A horizontal force of 36.0 N is applied to the block.

  • Aeroplane Dynamics for Maximum Take-Off

    At the cruise speed, the drag force balances the thrust (while the lift balances the weight) and the plane will run at constant speed and at constant height. The expert examines maximum take-offs for aeroplane dynamics.

  • Buoyant force acting on a ballon

    It will enable you to do similar problems yourself.

  • Change in linear Momentum and thrust

    Calculate the thrust exerted by the rope as it lands on the scale. What does the scale read when 0.233 kg of rope is on the scale (corresponding to a weight of 2.29 N)?

  • Evaluating financial health

    Similarly, companies facing problems with cash management and working capital will attach more importance to liquidity ratios such as quick ratio and current ratio.

View More Related Solutions