Here's some real-world test data for your motor: Bungymania Motors Data Base: Hyperion z3025-10
For working out what's best I use Motocalc, because it calculates the performance of the whole system (not just the motor). It costs $39, but is free to download and try out for 30 days. Here's a sample output:-
Motor: Hyperion HP-Z3025-10 (bungymania); 933rpm/V; 3A no-load; 0.05 Ohms.
Battery: Hyperion G3 CX 2500 (25C); 3 series x 2 parallel cells; 2300mAh @ 4.02V; 0.0021 Ohms/cell.
Speed Control: Hyperion Titan 80 BEC; 0.0012 Ohms; High rate.
Drive System: Aeronaut Folding 15x10; 15x10 (Pconst=1.11; Tconst=1) direct drive.
Airframe: Spyder 2.5m; 714sq.in; 70.1oz RTF; 14.1oz/sq.ft; Cd=0.036; Cl=0.42; Clopt=0.67; Clmax=1.04.
Stats: 242 W/lb in; 143 W/lb out; 19mph stall; 24mph opt @ 31% (92:00); 30mph level @ 38% (63:56); 2840ft/min @ 90°; -143ft/min @ -3.9°.
Conditions: Sea Level, 101.3kPa, 20°C
AirSpd (mph) = 0.0
Batt Amps = 90.8
Motor Amps = 90.8
Motor Volts = 11.7
Input (W) = 1059.3
Loss (W) = 433.7
MGbOut (W) = 625.6
MotGb Ef(%) = 59.1
Prop RPM = 6647
Thrust (oz) = 116.6
PSpd (mph) = 62.9
Prop Ef(%) = 0.000
Time (m:s) = 3:02
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This was done by one of the members on my setup.and yes the 2x2500 batts are in paralel.post#4.@ 8 to 10sec motor run.on on/off switch.