Computer Testing Supplement for IA.indb - Aviation Supplies ...

COMPUTED
WEIGHING POINT
(C MAIN WHEEL)
L
EXHIBIT 12
Empty weight and empty center of gravity—tail-wheel type aircraft.
D, MEASURED
TO FIND: EMPTY WEIGHT AND EMPTY WEIGHT CENTER OF GRAVITY
Datum is the leading edge of the wing (from aircraft specification)
(D) Actual measured horizontal distance from the main wheel
weighing point C L main wheel) to the Datum
(L) Actual measured horizontal distance from the rear wheel
weighing point (C
L
rear wheel) to the main wheel weighing
point 222"
SOLVING: EMPTY WEIGHT
Weighing
Point
DATUM (LEADING EDGE OF
WING ROOT SECTION)
C.G.
Scale
Reading #
LEFT SCALE 565 LBS.
RIGHT SCALE 564 LBS.
L, MEASURED
Tare #
SOLVING: EMPTY WEIGHT CENTER OF GRAVITY
Reference for formula, Figure 13.4
Net
Weight #
Right 564 0 564
Left 565 0 565
Rear 567 7 40
Empty Weight (W) 1169
TARE 27 LBS.
WEIGHING POINT
(C TAIL WHEEL)
L
This case is shown properly entered on a sample weight and
balance report form, Figure 13.17
SCALE READING
67 LBS.
Formula: C.G. = D + R x L = 3" + 40 x 222 = 3" + 7.6" = 10.6"
W
1169
FIGURE 13.5.—Empty weight and empty weight center of gravity—tail-wheel type aircraft.
3"
3-25