Rans S-12, Pilot Operating Handbook

Page: 10 / 35

Chapter 4 - Weight and Balance
The reference datum for weight and balance is at the center of the front wheel and with the
aircraft level, all arms and weights are measured rearward from there. Changes to standard
equipment require calculation of the weight and moment and a new ‘current’ weight and bal-
ance sheet should be printed, the old sheet being marked as “superceded.”
Installed Equipment, N6167U
Airframe White/Rans S-12XL Airaile Serial No. 04970797
Engine Rotax 912UL-2 Serial No. 4403068
Propeller Warp Drive 3 Blade Composite Serial No. T7760
Intercom PS-Engineering PM501 Serial No. XA-07690
ELT Ameri-King AK450 Serial No. 458 470
Fire Extinguisher H3R Right-Out 14oz Halon Serial No. V-162233
Weight and Balance
11 Oct, 1999
Weight Empty with full oil and antifreeze and no fuel: 610 lbs, Gross Weight 1100 lbs, Useful Load 490 lbs
Weight Arm Moment
Preflight Take-Off Weight and Balance Worksheet
Use the graphs on the following page to lookup the moments for each item. Mandatory data in [] optional in ()
Weight Arm Moment
If combined pilot and passenger weight are between 108 and 345 pounds that CG will be
acceptable regardless of fuel conditions. However, flying at the aft CG limit requires adjust-
ment of the horizontal stabilizer and hence as suggested by the test pilot, a solo pilot should
use 50 or 75 pounds of ballast when operating this aircraft. Failure to do so will impose severe
limits on the amount of nose down force available even with full forward stick. In any case,
always test the authority of the elevators by doing a short crow hop. The center of gravity
of the aircraft is the total moment divided by total weight and must fall within 69.5 and 76.5
inches (aft of the datum). The CG envelope is graphed on the following page, a point inside
the hatched region is safe with respect to loading.
PAGE 10
Rear tailwheel
14 lbs +214 in 2,996 lb*in
Left Main
298 lbs +78 in 23,244 lb*in
Right Main
298 lbs +78 in 23,244 lb*in
Empty Aircraft Totals
610 lbs +81 in 49,484 lb*in
Empty Aircraft
610 lbs +81 in 49,484 lb*in
Optional Ballast
75 lbs +20 in 1,500 lb*in
Pilot
[ ] +49 in [ ]
Passenger
[ ] +49 in [ ]
Fuel
[ ] +78 in [ ]
TAKE-OFF
[ ] ( ) [ ]
Acceptable CG Arm (Total Moment / Total Weight) is +69.5” to +76.5”