S2R-H80 Single & Dual Cockpit
AIRPLANE FLIGHT MANUAL
AFM H8001 SINGLE & DUAL COCKPIT Revision A
Page | 69
FAA APPROVAL DATE: 8/05/2014
EXAMPLE 1:
Let’s work an example weight and balance calculation for a single cockpit version or dual cockpit
with the rear seat empty.
Aircraft empty taken from the original weight and balance form is 4750 lbs with an arm of
25.02 inches and a total moment of 118,845.
Assume on a flight we will have:
200 lb. Pilot at an arm of 89.0 equals a total moment of 17,800.
400 gals of water in the hopper is a weight of 3320 lbs at an arm of 29.9 is a total
moment of 99,268.
150 gals of fuel that weighs 1005 lbs at an arm of 38.5 equal a total moment of
38,692.5.
Hopper rinse is full of water so the weight of water is 200 lbs., its arm is -30.0
inches with a total moment of -6000.0.
Smoker will be full of oil so it has a total weight of 26 lbs. at an arm -9.1 for a
total moment of -236.6
Weights
ARM
Moments
(units)
(units)
(units)
AIRCRAFT
4,750.00
25.02
118,845
PILOT
200
89
17,800
HOPPER
3,320.00
29.9
99,268
FUEL
1005
38.5
38,693
HOPPER RINSE
200
-30
-6,000
SMOKER
26
-9.1
-237
9,501.00
28.25
268,369
Divide the total Moment (268,368.9) by the total weight (9501.0) gives you an arm of (
28.25”).
Since the arm and the CG are the same thing, you have an aircraft that is well under the Gross
Weight limit and well within the CG limit, so
this flight can easily be made within the aircraft’s
limitations.
