Rans Inc.
Section 3
Model S-7LS COURIER
Weight and Balance Information
Original Issue
March 3, 2005
3- 7
Weight and Balance
The following will enable you to determine the weight and balance of your AC and to operate it
within the prescribed center of gravity limitations.
The S-7LS is a simple AC and so are the weight and balance calculations.
The AC is limited to two occupants. For solo flight the pilot has to occupy the front seat.
For baggage storage a baggage compartment behind the rear seat is available. The
compartment is rated for 50 lb. The baggage compartment should be closed securely in flight.
To figure the weight and balance use the Sample Loading Problem and Center of Gravity
Envelope as follows:
Enter the following data in the column “Your Airplane” on the Sample Loading
•
Basic Empty Weight and moment from your AC weight and balance records.
•
Weight of Front Seat Occupant and arm pending on seat position. Refer to
Figure 3-3.
•
Weight of Rear Seat Occupant and arm pending on seat position. Refer to
Figure 3-3.
•
Usable Fuel (at 6 lb./ gall).
•
Weight of Baggage.
Calculate the moments and total moment of your loading problem.
Calculate the total Take off Weight, total Moment and Center of gravity.
Check that the Center of Gravity calculated for take off falls inside of the Center of
Gravity Envelope.
(CG = Total Moment / Total Weight).
Repeat for Landing.
Note:
You can also read the moments from the Loading Graph in Figure 3-6, calculate the total
moment and check if it falls in the Center of Gravity Moment Envelope in Figure 3-7.
Item
Arm
Center of Gravity of Front Seat Occupant
37.4
*
(35.15 to 37.4)
Center of Gravity of Rear Seat Occupant
65.4
*
(63.15 to 65.4)
Center of Gravity of Baggage in Baggage
compartment
92.5
**
*
Pilot and Passenger center of gravity on adjustable seats positioned for
an average occupant (seat in rear most position).
** Measured to the center of the baggage area.
Figure 3-3. Loading Arrangements
