Unit 04: Anatomy Of Aircraft - Configuration at Fachhochschule Aachen | Flashcards & Summaries

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TESTE DEIN WISSEN

Pros/Cons Low Wing config.

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TESTE DEIN WISSEN

+ LDG Gear stowage

+ efficient internal fuselage layout (good for transportation)

- Fuselage must be placed farther off the ground (prop clearance) 

- ground clearance difficulties

-> main wings needs a dihedral angle to avoid striking the ground on a bad landing

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TESTE DEIN WISSEN

Percentage of conventional A/C Config. nowadays?

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TESTE DEIN WISSEN

Probably 70%

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TESTE DEIN WISSEN

Describe the three surface config

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TESTE DEIN WISSEN

Derived from canard design, aiming better stability & control (today: better perfomance)

- tendency to better L-D Ratio

- additional lifting surfaces

- hard to analyze (sophisticated methods)

- increased control complexity

- increased weight 

- increased drag

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TESTE DEIN WISSEN

what is the feature of the conventional config.

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TESTE DEIN WISSEN

Very good compromise between aerodynamic performance, weight, stability, and cost. (not the optimum of each these fields)

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TESTE DEIN WISSEN

Rough description of selecting an A/C design

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TESTE DEIN WISSEN

Look at many alternatives to make sure, that the best possible design is developed.

Detailed analysis & honest trade studies to meet customers needs with each config to select the best approach


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TESTE DEIN WISSEN

What is the canard config?

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TESTE DEIN WISSEN

Stabilizer in front of the main wing

- tendency to better L-D ratio

- can be very safe (avoid main wing stall)

- But hard to analyze without sophisticated (anspruchsvolle) aerodynamic methods

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TESTE DEIN WISSEN

What is the mission of the empennage?

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TESTE DEIN WISSEN

providing adequate stability & control


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TESTE DEIN WISSEN

Describe the flying wing config. (Nurflügler)

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TESTE DEIN WISSEN

Intention: Every surface should generate lift

- no weight & drag for empennage

- higher L-D Ratio

- Problems with flight mechanical stability (inherently stable)

- roll motion unpleasant (not for freighter)

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TESTE DEIN WISSEN

Count 3 vertical wing locations

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TESTE DEIN WISSEN

High wing

Mid wing

Low wing

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TESTE DEIN WISSEN

Pros/Cons High Wing config

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TESTE DEIN WISSEN

+ placing the fuselage close to the ground (Ground clearance)

+ lower danger of rocks & debris

+ reduced LDG Gear weight

- fuselage weight increased (must extra strengthened to support LDG Gear)

- blocks pilots visibility in a turn

- blocks upward visibility

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TESTE DEIN WISSEN

Pros/Cons Mid Wing config

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TESTE DEIN WISSEN

+ lowest drag

+ no need for fairings to attain acceptable interference drag with circular fuselage

- Bending moment must be carried across the fuselage (-> difficult, if carrying pax or freight there)

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TESTE DEIN WISSEN

Why you shouldn't deviate from conv. config.?

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TESTE DEIN WISSEN

Data base and experience are very large for the conventional one.
-> very high risk of unsuccessful design for unconv. A/C

Lösung ausblenden
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Q:

Pros/Cons Low Wing config.

A:

+ LDG Gear stowage

+ efficient internal fuselage layout (good for transportation)

- Fuselage must be placed farther off the ground (prop clearance) 

- ground clearance difficulties

-> main wings needs a dihedral angle to avoid striking the ground on a bad landing

Q:

Percentage of conventional A/C Config. nowadays?

A:

Probably 70%

Q:

Describe the three surface config

A:

Derived from canard design, aiming better stability & control (today: better perfomance)

- tendency to better L-D Ratio

- additional lifting surfaces

- hard to analyze (sophisticated methods)

- increased control complexity

- increased weight 

- increased drag

Q:

what is the feature of the conventional config.

A:

Very good compromise between aerodynamic performance, weight, stability, and cost. (not the optimum of each these fields)

Q:

Rough description of selecting an A/C design

A:

Look at many alternatives to make sure, that the best possible design is developed.

Detailed analysis & honest trade studies to meet customers needs with each config to select the best approach


Mehr Karteikarten anzeigen
Q:

What is the canard config?

A:

Stabilizer in front of the main wing

- tendency to better L-D ratio

- can be very safe (avoid main wing stall)

- But hard to analyze without sophisticated (anspruchsvolle) aerodynamic methods

Q:

What is the mission of the empennage?

A:

providing adequate stability & control


Q:

Describe the flying wing config. (Nurflügler)

A:

Intention: Every surface should generate lift

- no weight & drag for empennage

- higher L-D Ratio

- Problems with flight mechanical stability (inherently stable)

- roll motion unpleasant (not for freighter)

Q:

Count 3 vertical wing locations

A:

High wing

Mid wing

Low wing

Q:

Pros/Cons High Wing config

A:

+ placing the fuselage close to the ground (Ground clearance)

+ lower danger of rocks & debris

+ reduced LDG Gear weight

- fuselage weight increased (must extra strengthened to support LDG Gear)

- blocks pilots visibility in a turn

- blocks upward visibility

Q:

Pros/Cons Mid Wing config

A:

+ lowest drag

+ no need for fairings to attain acceptable interference drag with circular fuselage

- Bending moment must be carried across the fuselage (-> difficult, if carrying pax or freight there)

Q:

Why you shouldn't deviate from conv. config.?

A:

Data base and experience are very large for the conventional one.
-> very high risk of unsuccessful design for unconv. A/C

Unit 04: Anatomy of Aircraft - Configuration

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