Weight Estimate

8/11/2019 Weight Estimate

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Activity 4: Weight Estimate

To determine the estimated weight of each parts and components

=.. . ... /

−.[].

= .[]...

−.

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=.+.

...

−.

. .

= . . .−.−.. +

= ..

.

= ...

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=

=. . +

...

= . .. −.

= .

=. + .

=. .

− = . ....

=.

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1-4



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=0.036127.17 .380 . 7.8 1.01.

74.90 2.0.58. .

cos. −. [5.73,530.82 ].

=269.03

ℎ = 0.016[5.73,530.82 ]. (74.90 ).

(30.93 . .cos. −. .

..0.54−.

ℎ =35.00

=0.0731+1[5.73,530.82 ]. (74.90 )

.

(21.09 . .cos.−. ...0.7.

= 49.36 lb

= 0.052221.83 .[5.73,530.82 ].

14.09−.26.58 4.25 −. (74.90

).

=229.81

= 0.095[3 1.53,530.82].27.3612 .

=224.16 lb

= 0.125[3 1.53,530.82].27.612 .

= 60.31

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= 4142

= 828

= 2.4925 . 11 + 21.25

25 .2.2.

= 27.18

ℎ = 0.05326.58 .31.49 ft.[5.73,530.82 10 −].

ℎ = 51.43

ℎ = 0.0013,530.82

ℎ

= 3.53

= 12.5727.18 + 187.57 .

=194.37

= 2.117122.26 .

=187.57 lb

− = 0.2653,530.82 .4.187.57 .0.3.

− =105.23

ℎ = 0.05823,530.82 65ℎ = 140.49

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PARTCOMPUTED

weights

FUDGE

FACTOR

CORRECTED

WEIGHT

ESTIMATION

Structures group

269.03 lb 0.85 228.68 lb

35.00 lb 0.83 29.05 lb

49.36 lb 0.83 40.97 lb

229.81 lb 0.9 206.83 lb

224.16 lb 0.95 212.95 lb

60.31 lb 0.95 57.29 lb

Powerplant group

2,031.76 lb - 2,031.76 lb

27.18 lb - 27.18 lb

quipment group

51.43 lb - 51.43 lb

3.53 lb - 3.53 lb

194.37 lb - 194.37 lb

187.57 lb - 187.57 lb

140.49 lb - 140.49 lb

105.23 lb - 105.23 lb

Total empty weight 2405.47 lb - 2313.57 lb

Useful load group

170 lb - 170 lb

380 lb - 380 lb

15 lb - 15 lb

510 lb - 510 lb

143 lb - 143 lb

total

1,218 lb - 1,218 lb

Total gross weight 3,531.57 lb

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The approximation of the weight of a theoretical aircraft is a critical part of the

design process. Aircraft are designed to operate within certain weight limits. Exceeding these

limits can be dangerous. Unfortunately, each year there are a number of accidents related to

weight issues.

Aircraft performance and handling characteristics are affected by the gross

weight and center of gravity limits. An overloaded or improperly weighted aircraft will require

more power and greater fuel consumption to maintain flight, and the stability and

controllability will be seriously affected. Avoiding that situation, we must determine all the

levels of weight analysis.

This activity entitled “Weight Estimate” covers the fundamentals of aircraft

weight, solving for the parts/components’ weight to achieve the desired performance of the

conceptual aircraft. Aircraft gross weight has a big factor when it comes to the aspects of safety,

it is the summation of the aircraft empty weight and aircraft useful loads.

Aircraft empty weight comprises the weight of the wing, tail (horizontal and

vertical), fuselage, main landing gear, nose landing gear, installed engine, fuel system, flight

controls, hydraulic system, electrical system, avionics system, furnishing, air conditioning &

anti-icing system. Aircraft useful loads consist of the total baggage weight, crew and

passenger(s)’ weight, and fuel and oil loads where these should be adjusted accordingly toprovide an adequate margin of safety.

The aircraft performance characteristics that are adversely affected by

overweight are the increased takeoff speed, operational range, approach speed, increased

takeoff runway length, maneuverability, landing distance, rate of climb, controllability,

maximum altitude capability, and stall speed. Every designer must consider how these

characteristics would affect the aircraft by thoroughly understanding the ways of how to

determine the aircraft weights.

Using the Aircraft Design – A Conceptual Approach by Daniel P. Raymer,

Zurcx777’s designer had determined the estimated weight of each parts and components, also,with the help of the values from the previous activities created.

May this activity help the Zurcx777 achieve its desired performance and may

the Zurcx777 fly safely in the future.

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