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Weight and Balance

Weight and Balance. OBJECTIVES. Determine the “flying” weight & balance Determine your ‘pilot moment arm’ and the aircraft empty weight (optional). (Requires a second weighing) Ballast the aircraft to desired CG. REQUIRED EQUIPMENT. Suitable scales (For main and tail wheel)

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Weight and Balance

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  1. Weight and Balance

  2. OBJECTIVES • Determine the “flying” weight & balance • Determine your ‘pilot moment arm’ and the aircraft empty weight (optional). (Requires a second weighing) Ballast the aircraft to desired CG.

  3. REQUIRED EQUIPMENT • Suitable scales (For main and tail wheel) • Level, Plumb Bob, and Tape Measure • Suitable blocking to support ‘tail’ scales with the aircraft ‘leveled’. • Enclosed Area • Two People (minimum)

  4. REQUIRED INFORMATION(From W&B or Manual) • Datum Plane Location - Usually the wing leading edge at the wing root. • ‘Leveling’ criteria – Usually a level placed on the fuselage ahead of the fin with a defined taper (ratio) between the fuselage and level. • Distance (usually “A”) from datum to the main wheel. • Distance from datum to the tail wheel or skid. (usually “A” plus “B”)

  5. SAILPLANE PREPARATION • Position the level, with appropriate blocking / offset taped in place. • Chock the main wheel on the scales. • Install the batteries, drinking water, and whatever else gets added for flight such as the pilot and parachute. • Raise tail and position scales, with appropriate support, in correct attitude, per level bubble. Note: Tail lighter with pilot in cockpit.

  6. TAKING THE DATA • Checks- Canopy closed, wings balanced (no wing stands), level removed, no other points of contact. • Record scales readings (main and tail • Record tare (wheel chock etc.)

  7. CALCULATIONS(Aircraft, flying config.) Item Weight Station Moment M. Wheel 841 lbs 7.00 inches 5887 in.-lbs T. Wheel 28.5 178.31 5081.8 A/C, Flying 869.5 12.62* 10968.8 * Station = moment / weight =1096.8 / 869.5 = 12.62

  8. CALCULCATIONS(BALLAST WEIGHT) ITEM WEIGHT STA. MOMENT Aircraft 869.5 12.62 10968.8 Ballast 25 175.0 4375.0 A/C & bal 894.5 16.85 15073.8

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