Презентация, доклад Jets in flight


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Lesson Objectives
 Understand the Engineering Design Process
 Comprehend the basic principlesNavy AviationLesson Goal
 Apply the principles of flight and the engineering designLesson Organization
 Part 1: Understanding and applying the basic principles ofPart 1: The Principles of Flight
 Forces acting on an aircraftFlight is achieved by shifting the balance between the opposing forces
Thrust is produced in one of two ways:
 Thrust is producedLift is the upward force created as air passes over andBernoulli’s Principle:
 Bernoulli’s Principle:
 1. Fast moving air at the topBernoulli’s Principle:
 Bernoulli’s Principle:
 2. Slow moving air along the bottomBernoulli’s Principle:
 Bernoulli’s Principle:
 3. The difference in pressure creates theLift Momentum: additional upward force is generated incoming air deflects offPart 2: Designing a Prototype
 You are an engineer tasked withStep 1: Identify the Problem
 Step 1: Identify the Problem
 CreateStep 2: Identify Criteria and Constraints
 Step 2: Identify Criteria andComplete the remaining steps of the engineering design process and demonstrate



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

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Navy Aviation

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

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

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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

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

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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

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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

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

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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)

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

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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

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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.

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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.

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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?

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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.


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