CASE STUDY

Md Imtiaz Ikram Lecturer

Department of Aeronautical Engineering MIST

Dhaka, Bangladesh

4/2/2015

Workshop on RC Aircraft Design, Fabrication and Operation

OBJECTIVES

I. Overview of this workshop.

II. To understand the different perspective of

Aircraft Design.

III. To deploy the knowledge of this workshop

properly.

IV.To familiarize with different aircraft design

requirements and different aircraft design

competition.

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

Overview of RC aircraft design

Workshop

Total Class-16

Class Length-50 minutes

Starts from 30th March to 5th April (3 pm to 7 pm)

Topics to be covered:

1. Regulations + Introduction to Aeroskills

2. Concepts of Aerodynamics for RC Aircraft

3. Basic Rules of Thumb

4. Essential Components, Concepts and Construction of RC Airplane

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

Cont

5. Different Available VTOL platforms

6. Overview of Aircraft Design Software

7. Performance and Weight Analysis of an UAV

8. Fabrication :

I. Wing

II. Fuselage

III. Propulsion and Avionics

IV.Empennage

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

FINAL GOAL!!

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

AIRCRAFT DESIGN Engineering design process.

Factors of Aircraft Design

I. Customer And Manufacturer Demand

II. Safety Protocols

III. Physical And Economic Constraints

IV. Environmental Facttors

Regulated by National Airworthiness Authorities (e.g. CAAB for Bangladesh).

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

AIRCRAFT DESIGN

Optimization of Design Between many competing factors and

constraints and accounts for existing designs

and market requirements to produce the best

aircraft.

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

DESIGN CONSTRAINTS

Design Requirements

Aircraft Regulations

Financial Factors and Market

Environmental factors

Safety

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

DESIGN ASPECTS

o Aerodynamics

o Propulsion

o Controls

o Weight Estimation

o Structure

o CAD and Engineering Drawing

o Computational Fluid Dynamics (CFD)

4/2/2015

Workshop on RC Aircraft Design, Fabrication and Operation

Design Process

Conceptual Design

Preliminary Design

Detailed Design

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

CONCEPTUAL DESIGN

The first design step

Sketching a variety of possible aircraft configurations that meet the required design

specifications.

Design optimization

Fundamental aspects such as fuselage shape, wing configuration and location, engine size

and type are all determined at this stage.

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

PRELIMINARY DESIGN

Wind tunnel testing and computational fluid dynamic calculations of the flow field around

the aircraft are done

Major structural and control analysis is also carried out in this phase

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

DETAIL DESIGN PHASE

Deals with the fabrication aspect of the aircraft to be manufactured

determines the number, design and location of ribs, spars, sections and other structural

elements

Flight simulators for aircraft are also developed at this stage.

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

The Design Wheel

Sizing and Trade Studies

Design Analysis

Design Concepts

Requirements

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

Popular RC Aircraft Design

Competition

AIAA Cessna Raytheon Design/Build/Fly Competition.

SAE Aero Design Competition.

Future Flight Design (FFD)

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

Sample Case Study (For RC

Aircraft)

Aircraft Requirements:

The aircraft may be of any configuration except rotary wing or lighter-than-air.

Must be propeller driven and electric powered with an unmodified, over the counter model

electric motor.

May use multiple motors and/or propellers. May be direct drive or with gear or belt reduction.

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

Sample Case Study (Cont) Motors and batteries will be limited to a

maximum of 40 Amp current draw by means of a 40 Amp fuse

Must use over the counter NiCad batteries. For safety, battery packs must have shrink-wrap or other protection over all electrical contact points

Maximum battery pack weight is 5.0 lb. Battery pack must power propulsion and payload systems only. Radio Rx and servos MUST be on a separate battery pack. Batteries may not be changed or charged between sorties during a flight period.

4/2/2015

Workshop on RC Aircraft Design, Fabrication and Operation

Sample Case Study

Safety Requirements:

For safety, each aircraft will use a commercially produced propeller

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

SAMPLE CASE STUDY

The regulations of model aircrafts are controlled by AMA (Academy of Model

Aeronautics)

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

SIMPLE MISSION PROFILE

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

Take off

Cli

mb

Cruise

Landing

Des

cen

d

MISSION REQUIREMENTS

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

DESIGN REPORT

Executive Summary

Management Summary

Conceptual Design

Preliminary Design

Detail Design

Manufacturing Plan and processes

Testing Plan

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

SCOPE OF RC DESIGN

WORKSHOP

Provide an unique opportunity to understand and apply the theory underlying the working of

an aircraft.

To design a small RC aircraft as well as fabricate the same.

Introduced to the major concepts of Aeronautical Engineering

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

SCOPE OF RC DESIGN

WORKSHOP (CONT)

To introduce the safety and regulatory issues of flying RC Model Aircraft.

To familiarize with the basic rules of thumb for designing RC aircraft model.

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

To invent an airplane is nothing. To build one is something. But to fly is everything.

Otto Lilienthal

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation

Thank you

4/2/2015 Workshop on RC Aircraft Design,

Fabrication and Operation