Jets in flight презентация

Lesson Objectives Understand the Engineering Design Process Comprehend the basic principles of flight Apply the Engineering Design Process to aircraft design

Navy Aviation

Lesson Goal Apply the principles of flight and the engineering design process to design and construct a model of a Navy jet fighter.

Lesson Organization Part 1: Understanding and applying the basic principles of flight Part 2: Building a working prototype of a Navy jet fighter

Part 1: The Principles of Flight Forces acting on an aircraft in flight Thrust: the force that propels an aircraft forward Drag: air resistance that produces a force in the opposite direction of thrust Weight: gravitational force Lift: upward force acting in the opposite direction of weight

Flight is achieved by shifting the balance between the opposing forces Flight is achieved by shifting the balance between the opposing forces

Thrust is produced in one of two ways: Thrust is produced in one of two ways: Transfer of momentum when gases are ejected to the rear of the plane through jet engines Launching a plane with a catapult from the deck of an aircraft carrier

Lift is the upward force created as air passes over and beneath the wings of an aircraft Lift is the upward force created as air passes over and beneath the wings of an aircraft

Bernoulli’s Principle: Bernoulli’s Principle: 1. Fast moving air at the top edge of the wing creates a zone of low pressure

Bernoulli’s Principle: Bernoulli’s Principle: 2. Slow moving air along the bottom edge of the wing has the same pressure as the air at the front of the wing (Ambient Pressure)

Bernoulli’s Principle: Bernoulli’s Principle: 3. The difference in pressure creates the force of lift

Lift Momentum: additional upward force is generated incoming air deflects off the bottom of the wing and transfers momentum to the wing Lift Momentum: additional upward force is generated incoming air deflects off the bottom of the wing and transfers momentum to the wing

Part 2: Designing a Prototype You are an engineer tasked with building a model (prototype) of a small, lightweight aircraft that can carry a small camera (10-25 grams). The Navy plans to use this model in covert operations to collect intelligence. Naval Operations specifications require you to design a catapult to launch the prototype which must fly a minimum horizontal distance of 100 feet while remaining airborne for a minimum of 15 seconds. You may use only approved materials provided by the Navy as described in the Resources List. Maintain a record of your design process in a journal for post-Design assessment.

Step 1: Identify the Problem Step 1: Identify the Problem Create a small, lightweight model aircraft that can carry a small camera (10-25 grams) to collect intelligence information for the Navy.

Step 2: Identify Criteria and Constraints Step 2: Identify Criteria and Constraints Fly at least 100 feet horizontally Maintain flight for at least 15 seconds Construct a catapult device Others?

Complete the remaining steps of the engineering design process and demonstrate how your prototype meets the Navy’s specifications. Complete the remaining steps of the engineering design process and demonstrate how your prototype meets the Navy’s specifications.