Difference between revisions of "UH-4 Commuter/Weight and Balance"

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(WEIGHT AND CG LIMITS)
(WEIGHT AND CG CALCULATION)
 
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{| class=wikitable
 
{| class=wikitable
|Empty Weight: ||1570 lbs
+
|Empty Weight: ||900 lbs
 
|-
 
|-
|Empty Aircraft CG: ||111.6 in
+
|Empty Aircraft CG: ||78.4 in
 
|-
 
|-
|Empty Moment: ||175212 lb-in
+
|Empty Moment: ||70560 lb-in
 
|}
 
|}
  
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The following arm data can be used to calculate moment at each of these stations.
 
The following arm data can be used to calculate moment at each of these stations.
 
{| class=wikitable
 
{| class=wikitable
|Pilot ||79.6 in (2.04m)
+
|Pilot ||52.3 in (1.34 m)
 
|-
 
|-
|Fuel ||124.4 in (3.19m)
+
|Fuel ||94.4 in (2.42 m)
|-
 
|Baggage||163.8 in (4.2m)
 
  
 
|}
 
|}
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Total weight is calculated by adding total weight of empty aircraft, fuel, passengers and baggage. Fuel weight can be calculated assuming 6 pounds per gallon of fuel. The CG is obtained by dividing total moment by total weight. Moment at each station is obtained by multiplying the arm of that station by the weight at that station. Total moment is obtained by adding moment for each station and the moment for the empty aircraft.
 
Total weight is calculated by adding total weight of empty aircraft, fuel, passengers and baggage. Fuel weight can be calculated assuming 6 pounds per gallon of fuel. The CG is obtained by dividing total moment by total weight. Moment at each station is obtained by multiplying the arm of that station by the weight at that station. Total moment is obtained by adding moment for each station and the moment for the empty aircraft.
  
As an example, consider a 180 lb pilot, a 160 lb passenger and 25 gallons of fuel. Weight of the fuel will be 25*6=150 lb.
+
As an example, consider a 180 lb pilot, a 160 lb passenger and 20 gallons of fuel. Weight of the fuel will be 20*6=120 lb.
 +
 
  
  
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!Moment
 
!Moment
 
|-
 
|-
|Aircraft ||1824 ||111.6 ||203,558.4
+
|Aircraft ||900 ||78.4 ||70,560
 
|-
 
|-
|Pilot         ||180 ||79.6 ||14,328
+
|Pilot         ||180 ||52.3 ||9,414
 
|-
 
|-
|Co-Pilot ||160 ||79.6 ||12,736
+
|Co-Pilot ||160 ||52.3 ||8,368
 
|-
 
|-
|Fuel         ||150   ||124.4 ||18,660
+
|Fuel         ||120   ||94.7 ||14,160
 
|-
 
|-
|Total         ||2170 ||x ||249,282
+
|Total         ||1390 ||x ||102,502
 
|}
 
|}
  
The final CG is calculated by dividing the total moment 249,282 by the total weight 2170 yielding 114.8 inches. Cross checking the total weight and CG with the weight/CG limits indicates the aircraft is within limits. The "CG" is also calculated and displayed on the main menu for convenience.
+
The final CG is calculated by dividing the total moment 102502 by the total weight 1390 yielding 73.7 inches. Cross checking the total weight and CG with the weight/CG limits indicates the aircraft is within limits. The "CG" is also calculated and displayed on the main menu for convenience.

Latest revision as of 01:14, 2 August 2021

SECTION 5. WEIGHT AND BALANCE

1 WEIGHT AND CG LIMITS

The weight and CG limits for this aircraft are:

Max Gross Weight: 1600 lb
Max Forward CG: 70 inches
Max Aft CG: 77 inches

2 EMPTY WEIGHT AND CG

The empty weight and CG of this aircraft are:

Empty Weight: 900 lbs
Empty Aircraft CG: 78.4 in
Empty Moment: 70560 lb-in

3 CG ARM DATA

The following arm data can be used to calculate moment at each of these stations.

Pilot 52.3 in (1.34 m)
Fuel 94.4 in (2.42 m)

4 WEIGHT AND CG CALCULATION

Total weight is calculated by adding total weight of empty aircraft, fuel, passengers and baggage. Fuel weight can be calculated assuming 6 pounds per gallon of fuel. The CG is obtained by dividing total moment by total weight. Moment at each station is obtained by multiplying the arm of that station by the weight at that station. Total moment is obtained by adding moment for each station and the moment for the empty aircraft.

As an example, consider a 180 lb pilot, a 160 lb passenger and 20 gallons of fuel. Weight of the fuel will be 20*6=120 lb.


Item Weight Arm Moment
Aircraft 900 78.4 70,560
Pilot 180 52.3 9,414
Co-Pilot 160 52.3 8,368
Fuel 120 94.7 14,160
Total 1390 x 102,502

The final CG is calculated by dividing the total moment 102502 by the total weight 1390 yielding 73.7 inches. Cross checking the total weight and CG with the weight/CG limits indicates the aircraft is within limits. The "CG" is also calculated and displayed on the main menu for convenience.