Sunday, February 23, 2014

Weight and Balance Spreadsheet 2014

Attached is a new Weight and Balance spreadsheet for 2014.
This includes the replacement of the tailwheel, and a graph for 4 cases.

Download Spreadsheet here.

Friday, April 26, 2013

Weight and Balance - C-GMBP

Following are the details of the new Weight and Balance on the Eagle, C-GMBP, done in April 2013

Overview:
The plane was weighed using a high quality mechanical scale on each of the main gears, one at a time, and a bathroom scale on the tailwheel.
We were able to take several measurements in order to validate the numbers with a pilot and without a pilot.

Configuration of plane:
The plane is configured with 30 Liters of fuel, and with everything, including the ELT, removed from the turtledeck.
A second set of weights were taken with Miles in the cockpit, as well as Pat in the cockpit.  These numbers were run thru the calculations to validate the station for the pilot seat, which as it turns out is a bit off.

Raw Data:

ConfigurationLeft MainRight MainTailwheelTotal
Empty (30L) 543 lb536 lb 79 lb1158 lb
Miles & parachute (191 lbs)600 lb593 lb151 lb1344 lb
Pat & parachute (225 lbs)625 lb618 lb162 lb1405 lb

Calculating the CG of the measured plane uses the following formula:
CG = D + ((R*L)/W)
where:
D = the Datum of the main wheels (79.31")
R = Weight at Tailwheel (79) (Note: datum of TW = 235.38)
L = Distance from Mains to Tailwheel (235.38-79.31 = 156.07)
W = Weight of Plane (1158)

CG = 79.31 + ((79*156.07)/1158
CG = 89.96

Weight and Balance Calculation:
ItemWeight (lb)Station (in)=Moment
Empty (30L) 115889.96=104173.68
 Less 30L of fuel
-53
86.25=
-4571.25
True Empty Weight110590.14=99602.43

Weight and Balance Worksheet:
ItemWeight (lb)Station (in)=Moment
Empty110590.14=99602.43
Pilot (Pat)225143.37=32258.25
Passenger0111.32=0
Fuel (100 Liters )(25 Gals)16086.25=13800.00
Total
149097.76=145660.68
Fuel Burned off ( 50 Liters)(13 Gals)-8086.25=-6900.00
Total
141098.41=138760.68

ItemWeight (lb)Station (in)=Moment
Empty110590.14=99602.43
Pilot  143.37= 
Passenger 111.32= 
Fuel (100 Liters )(25 Gals)16086.25=13800.00
Total
  = 
Fuel Burned off ( 50 Liters)(13 Gals)-8086.25=-6900.00
Total
 98.41=