SFU-006 - Module 4 (Model answer)

Model Answer

Hear from a professional in this role to see how they might approach this task. The following pages are a detailed model answer for the work simulation on Preliminary Aircraft Design, geared towards a student interested in becoming an Aerospace Engineer.

Preparation Task (10 minutes)

Research Task (30 minutes)

Analysis Task (30 minutes)

Create Task (20 minutes)

Document and Present (15 minutes)

Reflection Task (10 minutes)

Expected Outcome

Preparation task (10 minutes):

Objective: By the end of this activity, learners will be able to understand project scope and constraints. Step one: Identify and outline the basic specifications for a small passenger aircraft. Consider the client brief, which includes:

• Passenger capacity: 10–20
• Range: 1,000–1,500 miles
• Cruising speed: 300–400 knots
• Payload capacity: 5,000–7,000 lbs
• Constraints: Cost-efficiency, short runway compatibility, low noise footprint, environmental sustainability

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Research task (30 minutes):

Objective: By the end of this activity, learners will be able to gain a comprehensive understanding of current market standards by analysing existing small passenger aircraft, enabling informed design decisions that balance innovation with proven performance. Step one: Gather information on existing small passenger aircrafts to inform your design. Research at least 3 similar aircrafts in operation today and create a comparison table.

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Step two: Then, evaluate design trade-offs: Which features contribute to efficiency, cost savings, or versatility?

View the design trade-offs →

Analysis task (30 minutes):

Objective: By the end of this activity, learners will be able to synthesise research insights and design constraints into a viable aircraft concept by selecting key design features and evaluating them through a SWOT analysis, ensuring each choice is justified and aligned with operational, structural, and environmental priorities.

Step one: Conduct a SWOT analysis to evaluate design options and choose the best approach for the aircraft. SWOT analysis:

STRENGTHS

WEAKNESSES

• High-wing configuration ensures excellent performance on short, rough airstrips, ideal for remote market access.
• Hybrid propulsion compatibility reduces fuel burn and aligns with sustainability goals.
• Modular cabin allows commercial flexibility (cargo vs. passengers).
• Composite materials improve fuel efficiency and reduce weight.
• Lower cost per flight hour compared to twin-engine options.

• Single-engine layout may face regulatory limitations in certain regions for passenger transport.
• Lower cruise speed than higher-end alternatives (limits appeal for fast regional routes).
• T-tail designs can be more complex to maintain compared to conventional tails.

STRENGTHS

THREATS

• Growing demand for STOL-capable and low-emission aircraft in underserved or remote areas.
• Government incentives for sustainable aviation initiatives and hybrid R&D.
• Global shift toward lightweight, low-cost air mobility, especially in developing regions.
• Ability to pioneer modular transport in mixed-use aviation markets.

• Emerging electric aircraft competitors offering zero-emission alternatives.
• Risk of rising composite material costs.
• Turboprop market saturation from established players.
• Slower cruise speed may reduce appeal for time-sensitive operators.

Read the design decision →

Create task (20 minutes):

Objective: By the end of this activity, learners will be able to produce and annotate a basic 2D CAD model of a conceptual aircraft design, demonstrating an understanding of layout, proportion, and structural component placement.

Step one: Create a 2D side and top-view sketch of your aircraft in CAD. Key features in the Model

1. Side View (Elevation)

2. Top View (Plan)

• Fuselage Length: 13.5 metres
• Engine Placement: Nose-mounted turboprop (to simplify design and maintenance)
• Wing Position: High-wing mounted 5.5 metres from nose, providing good ground clearance
• Landing Gear: Fixed tricycle gear with reinforced wide-base tyres for rough field use
• Passenger Door: Positioned behind the wing on port side
• Cargo Hatch: Underslung, near the rear, for modular flexibility
• T-tail: Horizontal stabiliser mounted 2.7m above the fuselage centreline

• Wingspan: 16.8 metres, with slight dihedral for stability
• Cabin Layout: 3 rows of 2+1 seating, space for modular cargo bay at rear
• Tailplane Span: 5.2 metres
• Control Surfaces: Basic placement for rudder, elevators and ailerons indicated
• Escape Hatch: Overwing, starboard side

Create task (20 minutes):

Objective: By the end of this activity, learners will be able to produce and annotate a basic 2D CAD model of a conceptual aircraft design, demonstrating an understanding of layout, proportion, and structural component placement.

Step one: Create a 2D side and top-view sketch of your aircraft in CAD.

Design Rationale Summary

CAD Modeling:

(included as annotation in model file) The high-wing, nose-propeller configuration ensures suitability for rural and rugged terrain, while the T-tail provides improved low-speed handling. Composite materials (not shown in sketch) would be used in the fuselage to reduce weight and emissions. The modular layout allows quick conversion between passenger and cargo use, increasing operational flexibility for underserved routes. Fixed gear was chosen for cost and simplicity in line with the low-cost brief.

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Document & present (15 minutes):

Objective: By the end of this activity, learners will be able to communicate their design clearly and professionally.

Step one: Compile research, analysis, and design work into a presentation.

View the Model Answer Presentation →

Reflection task (10 minutes):

Objective: By the end of this activity, learners will be able to critically reflect on their design process, identifying key challenges, trade-offs, and learning outcomes, and articulate how their experience could inform future aerospace projects or professional practice.

Step one: Engineer’s Log – Example Reflection on Conceptual Aircraft Design: Over the course of this simulation, one of the main challenges I encountered was balancing competing priorities in the design—particularly cost-efficiency versus performance. For example, while the Beechcraft King Air offered impressive speed and capacity, it came at the highest operational cost, making it incompatible with the brief. To resolve this, I focused on creating a hybrid of the Cessna Caravan and Pilatus PC-12—choosing a high-wing, single-engine layout for low-cost, rugged operation, while incorporating design refinements like a T-tail and composite materials to enhance performance and sustainability. A major trade-off I made was the use of a single turboprop engine, which aligns well with the goals of cost and fuel efficiency, but reduces redundancy compared to twin-engine configurations. I also opted for fixed landing gear instead of retractable gear to minimise complexity and maintenance costs, knowing this would slightly increase drag but better support operations on unpaved or short runways. To expand this concept into a full-scale engineering project, I would begin by developing a 3D CAD model with detailed structural components, followed by computational fluid dynamics (CFD) analysis for aerodynamic performance. I’d also consult regulatory frameworks on single-engine operations for passenger transport and engage in modular interior prototyping to optimise cargo/passenger flexibility. This experience taught me a great deal about the collaborative and iterative nature of aerospace design. Every decision impacts another system or constraint, and working through this reminded me of the importance of open-mindedness, critical thinking, and multidisciplinary awareness in engineering teams. It has definitely deepened my appreciation for how technical, commercial, and environmental considerations must coexist in real-world aircraft design.

8/9

Reflection task (10 minutes):

Objective: By the end of this activity, learners will be able to critically reflect on their design process, identifying key challenges, trade-offs, and learning outcomes, and articulate how their experience could inform future aerospace projects or professional practice.

Step two: Optional Extension: The Role of AI in Aerospace Design: As the aerospace industry continues to evolve, AI tools such as ChatGPT and design optimisation software are becoming increasingly valuable in both conceptual and applied engineering roles. In future aerospace projects, I can see several areas where these tools would streamline workflows and enhance decision-making. For example, AI-powered material selection tools can quickly evaluate trade-offs between strength, weight, cost, and environmental impact, helping engineers identify the most suitable materials for specific parts of the aircraft, far faster than manual comparison. Similarly, aerodynamic simulations enhanced by machine learning can accelerate computational fluid dynamics (CFD) modelling, providing accurate predictions and optimised shapes without the need for extensive trial-and-error testing. In client-facing roles, tools like ChatGPT can assist with generating clear, tailored reports that translate technical findings into accessible language for stakeholders. AI can also be used to help draft regulatory documentation or project proposals, saving time and ensuring consistency. In the future, I believe that engineers who can effectively collaborate with AI, knowing when and how to apply these tools, will be better positioned to deliver innovative, efficient, and client-focused solutions.

8/9

Expected Outcome

By completing this activity, you have gained practical experience in the early stages of aircraft design. You have successfully:

• Identified and applied key principles in aircraft design.
• Conducted thorough research and analysis to inform your design decisions.
• Created a preliminary 3D model of a small passenger aircraft.
• Compiled and presented your work in a professional manner.
• Reflected on the design process, gaining insights that will help you improve your skills and approach to aerospace engineering projects in the future.

This simulation has not only reinforced your understanding of aircraft design but has also equipped you with hands-on experience in balancing design constraints, using CAD tools, and presenting technical information clearly and effectively.

Design Decision: Based on the analysis, the optimal approach is to design a hybrid-ready, high-wing, single turboprop aircraft with a T-tail and modular cabin. This configuration maximises cost-efficiency, adaptability, and performance in remote and low-infrastructure areas. While it may sacrifice some speed and regulatory flexibility (due to the single-engine setup), its operational savings, environmental credentials, and cargo/passenger flexibility make it best suited to the target market.

Design Trade-Offs and Evaluation All three aircraft serve similar market segments but offer different design philosophies, each with strengths and compromises: Cessna Caravan: A simple, rugged, and cost-effective aircraft. The high-wing configuration improves ground clearance, making it ideal for short, unpaved runways. Its low cost per flight hour and fuel efficiency make it well-suited for low-volume, remote operations. However, it is slower and less pressurised, limiting comfort and speed. Pilatus PC-12: Offers a balance between performance and efficiency. It has higher speed and range, and a modern T-tail design that improves handling and stability at lower speeds. Slightly more expensive to operate, but more versatile for corporate and mixed cargo/passenger operations. Beechcraft King Air 350i: Best for speed, capacity, and twin-engine redundancy, making it suitable for higher-end operations or where regulations require multi-engine aircraft. However, it comes with the highest cost per hour and fuel consumption, making it less ideal for cost-sensitive or remote regions.