Searey LSA – Pilot’s Operating Handbook Version 5.0, Revision 8
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Maximum Forward C.G. Limit 95 inches Aft of Datum
Maximum Aft C.G. Limit 100.0 inches Aft of Datum
Datum: 68 inches in front of wing leading edge (from root of wing
to front of fiberglass nose)
Complete each horizontal line of calculation by multiplying Weight by
Arm to find the Moment.
Total the Weight and Moment columns.
Divide the Total Moment by the Total Empty Weight to determine the
Empty Weight Center of Gravity Location, from the Datum.
Nose ballast must be calculated and fitted if flying single pilot
without passenger to remain within CG limits specified
In the example below, the Empty Weight Center of Gravity (EWCG) is
107.25 inches aft of Datum. This distance is also known as the Empty
Weight Arm.
EWCG Location = _______(Total Moment) / ___(Empty Weight) = ______ inches aft of Datum
Example EWCG Location = 102,312 (Total Moment) / 954 (Empty Weight) = 107.25 inches aft of Datum
6.1.1 DEFINITIONS
6.1.1.1 EMPTY WEIGHT
The actual weight of the individual aircraft, including the structure, power
plant, fixed equipment, any fixed ballast, unusable (in-flight) fuel,
lubricants and coolant. Original Empty Weight is determined by actually
weighing the new aircraft before it is flown.
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