ProgressiveRC 10XP FMA Cellpro - Manual (Page 32)

Estimating performance factors
If you don’t have a way to directly measure your propulsion system’s electrical parameters, the Cellpro
10XP Charger enables you to estimate them using before- and after-flight measurements.
Collect data
Charge pack.
v
When charging is finished, record Fuel % and total pack voltage (i.e. sum of cell voltages).
v
Fly plane (or test on the ground). Record flight time in minutes.
v
Connect pack to charger. Record Fuel % and total pack voltage.
Calculate performance factors
Evaluate results
Average current during flight gives you a rough idea whether system components—ESC, motor,
connectors and wiring—are operating within their current ratings. Keep in mind that peak current
during flight may greatly exceed the average current you calculated.
Watts per pound is an approximate indicator of aircraft performance (other factors influencing
performance include lift, drag and motor type). Here are some guidelines:
25 to 30 watts per pound: level flight.
40 to 50 watts per pound: take off from smooth surface, climb.
50 to 75 watts per pound: take off from grass, sport aerobatics.
75 to 125 watts per pound: pattern aerobatics.
Over 125 watts per pound: 3D.
32