Nick Funnell Posted November 25, 2023 Share Posted November 25, 2023 HI CAN ANYONE GIVE ME AN IDEA OF WHAT PROP SIZE TO USE ON A GREENS MODEL TIGER MOTH ITS 78 INCH SPAN WITH A 50/55 320KV MOTOR AND 80 AMP SPEED CONTROLLER AND A 5000 6S BATTERY THANKS IN ADVANCE Quote Link to comment Share on other sites More sharing options...
Shaun Walsh Posted November 25, 2023 Share Posted November 25, 2023 (edited) 18x10 would appear to be a good start Remarks: Battery Load: 11.54 C Voltage: 21.30 V Rated Voltage: 22.20 V Energy: 111 Wh Total Capacity: 5000 mAh Used Capacity: 4250 mAh min. Flight Time: 4.4 min Mixed Flight Time: 7.9 min Weight: 858 g 30.3 oz Motor @ Optimum Efficiency Current: 38.09 A Voltage: 21.47 V Revolutions*: 6298 rpm electric Power: 817.9 W mech. Power: 730.4 W Efficiency: 89.3 % Motor @ Maximum Current: 57.69 A Voltage: 21.10 V Revolutions*: 5993 rpm electric Power: 1217.1 W mech. Power: 1074.1 W Efficiency: 88.3 % est. Temperature: 70 °C 158 °F Wattmeter readings Current: 57.69 A Voltage: 21.3 V Power: 1228.8 W Propeller Static Thrust: 5911 g 208.5 oz Revolutions*: 5993 rpm Stall Thrust: - g - oz avail.Thrust @ 0 km/h: 5911 g avail.Thrust @ 0 mph: 208.5 oz Pitch Speed: 91 km/h 57 mph Tip Speed: 516 km/h 320 mph specific Thrust: 4.86 g/W 0.17 oz/W Total Drive Drive Weight: 1473 g 52 oz Power-Weight: 256 W/kg 116 W/lb Thrust-Weight: 1.18 : 1 Current @ max: 57.69 A P(in) @ max: 1280.6 W P(out) @ max: 1074.1 W Efficiency @ max: 83.9 % Torque: 1.71 Nm 1.26 lbf.ft Climb Capacity: 2177 m 7142 ft Airplane All-up Weight: 5000 g 176.4 oz Wing Load: 42.1 g/dm² 13.8 oz/ft² Cubic Wing Load: 3.9 est. Stall Speed: 30 km/h 19 mph est. Speed (level): 80 km/h 50 mph est. Speed (vertical): 17 km/h 11 mph est. rate of climb: 8.2 m/s ( ~60...65° ) 1616 ft/min Edited November 25, 2023 by Shaun Walsh Quote Link to comment Share on other sites More sharing options...
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