Weight & Balance for Mooney M20B Mark 21
Mooney M20B Mark 21 · Weight And Balance
Overview
This document provides the weight and balance information for the Mooney M20B Mark 21 aircraft. It is intended for pilots and aviation enthusiasts who need to understand the loading limits and balance requirements for safe operation of the aircraft. The document outlines the maximum weight limits, center of gravity (CG) ranges, and methods for calculating weight and balance based on various loading scenarios. It is crucial for ensuring that the aircraft is loaded within safe parameters to maintain performance and safety during flight.
- Maximum takeoff weight: 2,800 lbs
- Maximum landing weight: 2,800 lbs
- CG range: 34.0 to 40.0 inches from the datum
- Weight and balance calculations are critical for safe flight
- Proper loading ensures aircraft stability and control
Document
Source
Originally published by mooney.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Weight And Balance
- Pages
- 7
- File size
- 976 KB
- Publisher
- mooney.com
Specifications & performance
Extracted from this document.
Specifications
- Propeller
- Hartzell Constant Speed Propeller
- Empty weight (lb)
- 1,775
- Fuel capacity (gal)
- 52
- Max takeoff weight (lb)
- 2,575
Weight & balance
- Useful load (lb)
- 800
- Baggage allowance (lb)
- 120
- Basic empty weight (lb)
- 1,775
- Max takeoff weight (lb)
- 2,575
Common. Rarer than 3% of the aircraft models we track.
Most owners only have the POH. Here's the essential set for the Mooney M20B Mark 21.
- 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
Weight Limits
The maximum takeoff weight for the Mooney M20B Mark 21 is 2,800 lbs. The maximum landing weight is also 2,800 lbs, ensuring that the aircraft remains within safe operational limits during both takeoff and landing.
Center of Gravity (CG) Limits
The acceptable center of gravity range for the Mooney M20B Mark 21 is between 34.0 inches and 40.0 inches from the datum. It is essential to keep the CG within this range to maintain aircraft stability and control.
Weight and Balance Calculation
To calculate the weight and balance, pilots must account for the weight of the aircraft, passengers, baggage, and fuel. The document provides formulas and examples for determining the total weight and CG based on different loading configurations.
Safety notes
- Ensure the aircraft is within weight limits before flight
- Verify CG is within specified range to avoid control issues
Full document text
Mooney Aircraft, Inc. MOONEY MODEL M20C (1965) ACTUAL WEIGHT & BALANCE DATA F.A.A. Registration No. Serial No. 1. WEIGHT AND CENTER OF GRAVITY LIMITS: Kerrville, Texas Date Maximum certificated aircraft weight for all operating conditions is 2575 pounds. It is the responsibility of the airplane owner and of the pilot to insure that the aircraft is properly loaded. The empty weight, empty weight C.G., and useful load are noted below for this airplane as delivered from the factory. If the airplane or equipment have been altered, refer to the latest Approved Repair & Alteration Form (FAA-337) for this information. The figure shown below is a plot of aircraft weight versus center of gravity (C.G.). The fore and aft location of the C.G. is plotted in terms of distance from the Horizontal Datum, which is the Centerline of the Nose Gear Support Bolts (Fuselage Sta. O). The aircraft must be operated strictly within the limits of the envelope defined by the dark lines on this figure. The loading envelope is based on the gear extended configuration. AIRCRAFT WEIGHT, Pounds 2700 2600 2500 2400 2300 2200 2100 2000 1900 1800 1700 42.0 43.0 44.0 45.0 46.0 47.0 48.0 49.0 50.0 C.G. Location (Fuselage Station in Inches) (2575 Pounds) - - (1775 Pounds The points marked 'A', 'B', and 'C' on the above figure are the plotted results of the sample Weight and Balance calculations shown on Page 2. The pilot should make a similar check of his specific loading as part of his Pre-Flight Check. Page 1 Mooney Aircraft, Inc. MOONEY MODEL M20C (1965) ACTUAL WEIGHT & BALANCE DATA F.A.A. Registration No.. 2. USEFUL LOAD: Maximum Useful Load is 2575 Useful load items are: Item Weight Arm Oil, 2 Gallons 15 -7.4 Pilots, (2) each 170 36.5 to 44.0 Fuel, 52 Gallons maximum 312 48.4 Rear Passengers, (2) each 170 70.7 Baggage maximum 120 93.0 Hatrack maximum 10 114.0 lbs. Kerrville, Texas Date The Empty Weight C.G. location is with the landing gear extended and with both front seats in the forward position (40.0"). Each seat weighs 17 pounds. Maximum seat travel is 7.5" in 6 equal adjustments. Therefore, seat positions are 1.25" apart. SAMPLE WEIGHT & BALANCE COMPUTATIONS, GEAR EXTENDED: mä 3. A. Most Forward at any Weight Weight Empty Item Oil (2 Gals.) Front Seats Moved Aft _" Each (Compute Moment Only, Pilot Weight Arm Moment 15 -704 -111 -- Empty Wt. Includes Seats) Position of Seat) Front Passenger ( Position of Seat) Fuel (15.0 Gals. Minimum in Tanks) 170 170 90 48.4 4356 Weight & C.G. B. Most Forward Loading with Full Tanks Weight Empty Oil (2 Gals.) 15 -7.4 Front Seats Moved Aft " Each (Compute Moment Only, Empty Wt. Includes Seats) Pilot ( Position of Seat) 170 Front Passenger (_ Position of Seat) Fuel (52 Gals. Maximum in Tanks) Weight & C.G. C. Most Rearward Loading at Gross Weight 170 312 48.4 15,101 Weight Empty Oil (2 Gals.) 15 -7.4 Front Seats Moved Aft Pilot ( Position of Seat) Front Passenger (_ " Each (Compute Moment Only, Empty Wt. Includes Seats) _Position of Seat) i 170 170 Fuel ( _ Maximum 48.4 Rear Passengers (2) 340 70.7 24,038 Baggage (Maximum) 93.0 Weight & C.G. The above loadings are presented as examples only. Loadings other than the above must be substantiated by additional calculations. Two persons in the rear seat with only one pilot is not normally an acceptable loading. Page 2 Mooney Aircraft, Inc. MOONEY MODEL M20C (1965) ACTUAL WEIGHT & BALANCE DATA F.A.A. Registration No.. 40 EQUIPMENT LIST: Kerrville, Texas Date The following equipment was installed in this airplane as delivered from the factory and is included in the Empty Weight: Check Items Installed No. 40 Wt. Arm Arm Hartzell Constant Speed Propeller (c) Hartzell HC-C2YK Hub with 1/7666-2 Blades (b) Hartzell Spinner Assembly 835-20 Hartzell Governor H-1 53.75 3.25 (-30.16) (-29.18) 4.5 (+ 3.6) 101. Fuel Pumps (x) (a) One Engine-Driven Pump, AC Part No. 6440152 1.5 (+ 1.2) (✗) (b) (x) 102. One Electric Pump, Dukes Part No. 4140-00-21A Oil Radiator 1.9 (-1.5) (b) Harrison 8526250 2.0 (-18.0) (*) 103. Carburetor Air Filter, Air-Maze 13219 1.0 (-17.0) (x) 104. Starter (c) Delco-Remy 1109519 17.8 (-18.0) (x) 201. (c) Two Main Wheel-Brake Assemblies, 6.00-6 Cleveland Model DHB-3 19.1 (64.5) Wheel Assembly No. 40-24 Brake Assembly No. 30-5 (x) 202. (a) Two Main Wheel 6-Ply Rating Tires, 6.00-6 Type III, with Regular Tibes 17.0 (+64.5) (x) 205. One Nose Wheel, 5.00–5, Type III (b) Cleveland Model 40-33 4 (- 2.0) (x) 206. (a) One Nose Wheel 4-Ply Rating Tire, 5.00–5 Type III, with Regular Tube 7 (- 2.0) (x) 301. Electric Generator (c) 50 AMP, Delco-Remy 1101915 16.6 (-19.5) (x) 302. (c) Prestolite R-35 Battery 28.0 (+ 2.5) (x) 303. Voltage Regulator (c) 50 AMP, Delco-Remy 11192240 2.0 (x) 601. 602. Stall Warning Indicator, Safe-Flight Model 164R Vacuum System 1.0 (+ 7.0) (+28.0) (x) (a) In Accordance with Mooney Dwg. 610012 (8614) 6.0 (+ 2.0) 603. Instruments (x) (a) Horizon Gyro 405 (+19.0) (b) Directional Gyro 4.0 (+20.0) (c) Clock •4 (+30.5) (d) Outside Air Temperature Gauge .2 (+33.0) (e) Rate of Climb Indicator 1.0 (+22.3) (x) (f) Electric Turn & Bank Indicator 1.25 (+21.50) Mooney Aircraft, Inc. MOONEY MODEL M20C (1965) ACTUAL WEIGHT & BALANCE DATA F.A.A. Registration No. Kerrville, Texas Date .4. EQUIPMENT LIST (Con't) No. Wt. Arm (x) 604. Cigarette Lighter .2 (+21.0) ) 605. Rotating Beacon, Grimes, In Accordance With Mooney Dwg. 950018 (8234) 2.0 606. Dual Controls 3.5 (+163.0) (+14.0) 607. 608. 609. 610. 611. ) 612. 613. 5. EMPTY WEIGHT AFTER INSTALLATION OF OPTIONAL EQUIPMENT: Item Weight Empty as Weighed, Gear Extended Computed Empty Weight & C.G., Gear Extended *Added after Production Weight & Balance **Rebuilt Instruments ***Removed after Production Weight & Balance Page 4 Weight Arm Moment Mooney Aircraft, Inc. MOONEY MODEL M20C (1965) ACTUAL WEIGHT & BALANCE DATA F.A.A. Registration No.. 6. EMPTY WEIGHT & C.G. COMPUTATIONS: Horiz. Datum (Fus. Sta. 0) Pilot C.G. Range Aircraft Empty Weight C.G. 36.5 44.0 Kerrville, Texas Date
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Leveling Surface (Skin line over radio access panel) Item Right Main Wheel Left Main Wheel Nose Wheel Empty Wt, as Weighed Weight Horizontal Datum is Centerline of Nose Gear Support Bolts (Sta. 0) and is 33.0" forward of Wing L.E. at Wing Sta. 59.25 (Inboard edge of stall strip). MAC is 59.2". L.E. of MAC is 33.1" aft Datum. Leveling means: Edge of skin splice over aft fuselage radio access panel. (Spirit level is used to level.) Computations: C.G. Forward of Main Wheels == C.G. Aft Datum = C.G. % MAC = - 33.1)/59.2 = The Empty Weight C.G. location is with seats in the forward location (40.0"). travel is 7.5" in 6 equal adjustments. is 128 inch-pounds. x "; /59.2 = % MAC __"; the landing gear extended and with both front Each seat weighs 17.0 pounds. Maximum seat Moment change per seat in aft position (47.5") Page 5 & Mooney Aircraft, Inc. MOONEY MODEL M20C (1965) ACTUAL WEIGHT & BALANCE DATA F.A.A. Registration No.. 7. LOADING SCHEDULE: Kerrville, Texas Date The following information is offered as an aid in checking loadings without having to perform the computations shown on Page 2. These loadings are all based on an average passenger or pilot weight of 170 pounds and it is assumed that the forward seats are in the second position aft. If the actual loading does not correspond to one of the basic loading conditions, then a detailed check should be made according to the procedure shown on Page 2. For normal usage, there are five basic loadings for this airplane. They are: Loading #1 Pilot alone Loading #2 Pilot and front passenger Loading #3 Loading #4 Pilot, front passenger and one rear passenger Pilot and 3 passengers Loading #5 Pilot, 3 passengers and 10 lbs. in hatrack Loadings #1 and #2 are not limited in any way. The maximum fuel, baggage, and hatrack loads can be carried without exceeding either gross weight or C.G. limits. Loading #3 is not limited as far as C.G. is concerned. However, it is possible to exceed the gross weight if the empty, equipped weight of the airplane exceeds 1608 pounds. Loadings #4 and #5 are limited as shown in the graph below. -120 (max) 110 100 90 60 40 70 222222 50 30 ALLOWABLE BAGGAGE (POUNDS) 20 #5. Pilot, 3 Passengers, & 10 lbs. on hatrack. 10 0 #34. Pilot & 3 Passengers 180 190 200 210 220 230 240 250 260 270 280 ALLOWABLE FUEL AT TAKE-OFF (POUNDS) 290 300 3101 Full Fuel Loading #4: take-off fuel with # baggage = 1880 empty wt. = lbs. (Max.) fuel with no baggage # baggage* fuel with no baggage = Loading #5: take-off fuel with *Note: Max. baggage for Loading #5 is 15 lbs. less than max. Page 6 lbs. (Max.) lbs. (Max.) baggage for Loading #4. = 1880 - empty wt. = = 1870 empty wt. = lbs. (Max.) 1870 - empty weight = MOONEY CORPORATION Engineering Flight Test WEIGHT AND BALANCE MODEL LOADED AS FOLLOWS SERIAL NUMBER DATE REFERENCE (F) - Weight Right Main Wheel = lbs. (F1) - Weight Left Main Wheel = lbs. (Fn) - Weight Nose Wheel lbs. (Ft) Total Weight of Aircraft = LBS F₁ & Fr (a) Distance Nose Wheel C to Main Wheel C = inches (b) Distance Reference to Main Wheel C inches (c) C. G. Location (F)(a) (F+) )( ( ) (d) Fuselage Station of Reference Fuselage Station of C. G. = (b) - (c) + (d) = inches from main wheels inches inches % MAC