WEIGHT AND BALANCE
Robinson R44 Cadet · Weight And Balance
Overview
This document provides essential weight and balance information for the Robinson R44 Cadet helicopter. It outlines the importance of adhering to specified weight and balance limits to ensure safe operation. The document includes instructions for calculating the helicopter's loaded weight and center of gravity (CG), as well as a record form for maintaining continuous weight and balance history. It emphasizes the need for recalculating weight and balance after any modifications or equipment changes, and it provides detailed loading instructions to assist pilots in achieving safe loading configurations. The information is crucial for pilots and operators to ensure compliance with FAA regulations and safe flight operations.
- The helicopter must be operated within specified weight and balance limits to ensure safe control.
- Ballast can be added to adjust the center of gravity, but recalculations are necessary after any changes.
- The basic empty weight of the helicopter is 1460 lb, and the maximum takeoff gross weight is 2106.5 lb.
- Fuel burn affects the center of gravity; always check loading with both empty and full fuel conditions.
- A detailed weight and balance record must be maintained for any changes in equipment or modifications.
Document
Source
Originally published by robinsonstrapistorprod.blob.core.windows.net. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Weight And Balance
- Year
- 2016
- Pages
- 10
- File size
- 4.6 MB
- Publisher
- robinsonstrapistorprod.blob.core.windows.net
Specifications & performance
Extracted from this document.
Specifications
- Empty weight (lb)
- 1,460
- Max takeoff weight (lb)
- 2,106.5
Weight & balance
- Useful load (lb)
- 646.5
- Basic empty weight (lb)
- 1,460
- Max takeoff weight (lb)
- 2,106.5
Common. Rarer than 10% of the aircraft models we track.
Most owners only have the POH. Here's the essential set for the Robinson R44 Cadet.
- Pilot's Operating Handbook / AFM
- Checklist
- Maintenance Manual
- Parts Catalog (IPC)
- Systems & Wiring
- Service Bulletins
- Type Certificate (TCDS)
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In this document
General
This section explains the importance of operating the helicopter within specified weight and balance limits to ensure safe control. It mentions that the center of gravity can be adjusted with removable ballast and that recalculating weight and balance is necessary after any changes. It also notes that while the weight and balance data is not subject to FAA approval, the loading instructions are approved.
Weight and Balance Record
This section provides a form for maintaining a continuous record of the helicopter's weight and balance. It instructs operators to log any changes in equipment or modifications that affect weight and balance, and to determine the new center of gravity after each change.
Loading Instructions
This section includes a table for calculating the loaded helicopter weight and CG position based on various items and their weights and arm positions. It provides specific weights for pilots, passengers, baggage, and fuel, along with their respective longitudinal and lateral arms.
Sample Loading Calculation
A sample calculation is provided to demonstrate how to determine the loaded helicopter weight and center of gravity. It includes a detailed breakdown of weights, locations, and moments for various items, culminating in the total weight and CG for takeoff.
Safety notes
- Loading outside the specified limits can result in insufficient control travel for safe operation.
- Fuel burn causes the center of gravity to move forward during flight; always determine safe loading with empty fuel as well as with takeoff fuel.
Full document text
SECTION 6 WEIGHT AND BALANCE CONTENTS Page General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 Weight and Balance Record . . . . . . . . . . . . . . . . . . . . . . 6-2 Loading Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4 ISSUED: 29 APR 2016 6-i ROBINSON R44 CADET SECTION 6 WEIGHT AND BALANCE INTENTIONALLY BLANK ISSUED: 29 APR 2016 6-1 ROBINSON R44 CADET SECTION 6 WEIGHT AND BALANCE SECTION 6 WEIGHT AND BALANCE GENERAL The helicopter must be flown only within weight and balance limits specified in Section 2. Loadings outside these limits can result in insufficient control travel for safe operation. The center of gravity may be adjusted by adding removable ballast (any appropriate item of mass) to any baggage compartment. Recalculate weight and balance after adding ballast, and verify ballast meets baggage compartment limits given in Section 2. Loaded helicopter weight and balance can be determined using the method given under LOADING INSTRUCTIONS. In accordance with FAA procedures, the detail weight and balance data of this section are not subject to FAA approval. The loading instructions of this section, however, have been approved by the FAA as satisfying all requirements for instructions on loading of the rotorcraft within approved limits of weight and center of gravity and on maintaining the loading within such limits. CAUTION Fuel burn causes CG to move forward during flight. Always determine safe loading with empty fuel as well as with takeoff fuel. Payload may be limited by forward CG as fuel is burned. WEIGHT AND BALANCE RECORD The following form should be used to maintain a continuous record of your helicopter’s weight and balance. Each time an item of equipment is removed or installed, an entry must be made and the new empty CG determined. The original factory weight and balance and an equipment list is supplied with each helicopter on a form which is inserted at the end of this section. This weight and balance provides the first entry in the Weight and Balance Record form. NOTE Calculated CG with full fuel and 150 lb (68 kg) pilot must be within CG limits. Following modi- fication, adjustment to fixed nose ballast may be required. See R44 Maintenance Manual. ISSUED: 29 APR 2016 6-2 ROBINSON R44 CADET SECTION 6 WEIGHT AND BALANCE ISSUED: 29 APR 2016 6-3 ROBINSON R44 CADET SECTION 6 WEIGHT AND BALANCE WEIGHT AND BALANCE RECORD (Continuous History of Changes in Structure or Equipment Affecting Weight and Balance) HELICOPTER MODEL R44 SERIAL NUMBER: DATE DESCRIPTION OF ARTICLE OR MODIFICATION WEIGHT CHANGE RUNNING BASIC EMPTY WEIGHT ADDED (+) REMOVED (—) WEIGHT (lb) LONGITUDINAL LATERAL (+ = RIGHT SIDE) WEIGHT (lb) LONGITUDINAL LATERAL Arm (in.) Moment (in.-lb) Arm (in.) Moment (in.-lb) Arm (in.) Moment (in.-lb) Arm (in.) Moment (in.-lb) HELICOPTER AS WEIGHED WEIGHT AND BALANCE RECORD (cont’d) REVISED: 26 JAN 2024 6-4 ROBINSON R44 CADET SECTION 6 WEIGHT AND BALANCE LOADING INSTRUCTIONS The following table may be used when calculating loaded helicopter weight and CG position. COMMON ITEM WEIGHT & CG Item Weight (lb) Longitudinal arm (in.) Lateral arm (in.) (+ = right side) Pilot (right seat) 49.5* +12.2 Passenger (left seat) 49.5* —10.4 Baggage under seats 44.0 ±11.5 Aft baggage compartments and deck 78.0 ±12.2 Main fuel** 106.0 —13.5 Aux fuel** 102.0 +13.0 Forward doors 7.5 each 49.4 ±24.0 Aft doors 7.0 each 75.4 ±23.0 Removable controls (cyclic, collective, pedals) 2.0 31.0 —13.0 Items on accessory mount bars 25.0 ±14.0 * If additional backrest cushion is used, subtract thickness of compressed cushion. ** A longitudinal arm of 104.5 in. may be used for combined main and aux fuel. ISSUED: 29 APR 2016 6-5 ROBINSON R44 CADET SECTION 6 WEIGHT AND BALANCE LOADING INSTRUCTIONS (cont’d) The following sample calculation demonstrates how to de- termine loaded helicopter weight and center of gravity. A worksheet is provided on the page following the sample calculation for a weight and balance calculation for your helicopter. Calculated weight and balance must be com- pared with the CG limits given in Section 2 to determine safe loading. Both takeoff and empty fuel conditions must be within limits. Lateral CG usually falls well within limits for conventional loadings. If an unusual lateral installation or loading occurs, lateral CG should be checked against the CG limits given in Section 2. The lateral reference datum is the aircraft centerline with items to the right positive and items to the left negative. REVISED: 26 JAN 2024 6-6 ROBINSON R44 CADET SECTION 6 WEIGHT AND BALANCE LOADING INSTRUCTIONS (cont’d) SAMPLE LOADING CALCULATION Item Weight (lb) Location Moment Long. Arm (in.) Lat. Arm (in.) += Right Side Long. (in.-lb) Lat. (in.-lb) Basic empty weight 1460 106.2 0.2 155,052 292 Remove forward right door —7.5 49.4 24.0 —371 —180 Remove forward left door 49.4 —24.0 Remove aft right door 75.4 23.0 Remove aft left door 75.4 —23.0 Remove left seat controls 31.0 —13.0 Pilot (right seat) 170 49.5 12.2 8415 2074 Passenger (left seat) 170 49.5 —10.4 8415 —1768 Baggage under right seat 44.0 11.5 Baggage under left seat 44.0 —11.5 Aft right compartment and deck 20 78.0 12.2 1560 244 Aft left compartment and deck 10 78.0 —12.2 780 —122 Items on accessory mount bars 5 25.0 14.0 125 70 Zero usable fuel weight and CG* 1827.5 95.2 0.3 173,976 610 Usable main fuel at 6 lb/gal. 177 106.0 —13.5 18,762 —2390 Usable aux fuel at 6 lb/gal. 102 102.0 13.0 10,404 1326 Takeoff Gross Weight and CG* 2106.5 96.4 —0.2 203,142 —454 * CG location (arm) for loaded helicopter is determined by dividing total moment by total weight. REVISED: 26 JAN 2024 6-7 ROBINSON R44 CADET SECTION 6 WEIGHT AND BALANCE LOADING INSTRUCTIONS (cont’d) LOADING CALCULATION WORKSHEET Item Weight (lb) Location Moment Long. Arm (in.) Lat. Arm (in.)
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+= Right Side Long. (in.-lb) Lat. (in.-lb) Basic empty weight Remove forward right door 49.4 24.0 Remove forward left door 49.4 —24.0 Remove aft right door 75.4 23.0 Remove aft left door 75.4 —23.0 Remove left seat controls 31.0 —13.0 Pilot (right seat) 49.5 12.2 Passenger (left seat) 49.5 —10.4 Baggage under right seat 44.0 11.5 Baggage under left seat 44.0 —11.5 Aft right compartment and deck 78.0 12.2 Aft left compartment and deck 78.0 —12.2 Items on accessory mount bars 25.0 Zero usable fuel weight and CG* Usable main fuel at 6 lb/gal. 106.0** —13.5 Usable aux fuel at 6 lb/gal. 102.0** 13.0 Takeoff Gross Weight and CG* * CG location (arm) for loaded helicopter is determined by dividing total moment by total weight. ** A longitudinal arm of 104.5 in. may be used for combined main and aux fuel. Do not use combined main and aux fuel if calculating lateral arm. THIS PAGE INTENTIONALLY BLANK ISSUED: 29 APR 2016 6-8 ROBINSON R44 CADET SECTION 6 WEIGHT AND BALANCE
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