TWIN COMANCHE C/R
EMPTY WEIGHT C.G. AS WEIGHED
Empty Weight C.G. Forward Main Wheel Centerline:
A. (N) 694 x 87 = 251 Inches
(T) 2409
Empty Weight C.G. Aft of Wing Leading Edge at Wing Station 97.0:
B. 29.7 -(A) 25.1 =
4.6
inches
Empty Weight C.G. Aft Datum:
C. 79.0+(B) 4*6 =
83.6
inches
EMPTY WEIGHT AND C.G. WITH UNUSABLE FUEL
.
jtem Weight
Moment
Empty Weight as Weighed
2409
83.6
201392
Unusable Fuel (6.0 Gal. Inboard Tanks)
36
90 3240
TOTAL
24% z7 204632
BASIC WEIGHT AND C.G.
(With unusable fuel and oil - for use with Visual Plotter, and Weight vs. C.G. Chart.)
The following calculation is performed here for simplicity to aid the pilot in his calculations. This
weight and C.G. will be referred to as “Basic Weight and C.G.“:
Item Weight Arm Moment
Empty Weight as Weighed
2409 83.6
201392
Oil (4.0 Gal.)
30 51.0 1530
Unusable Fuel (6.0 Gal. Inboard Tanks)
36 90.0 3240
TOTAL 24%
83.3 206162
Basic Weight and C.G. is
2475 lbs. at 83.3 inches aft datum.
NOTES
( 1) The Empty and Basic Weights include 6 gallon of unusable
fuel (6.0 lbs. per gal. = 36 lbs. total). This fuel should not be
considered part of the disposable load which the pilot wishes
to add to the airplane. However, any fuel beyond this
amount which remains in the tanks from previous flights
must be considered part of the disposable load.
(2)
Each engine has an oil capacity of 2 gallons (at 7.5 lbs. per
gal. = 30 Ibs. total).
REPORT: 1605 PART II PAGE 2
MODEL: PA-39
ISSUED: Novexnber 2.8,1969
REISSUED: June 1,197O
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