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Motocalc zei:MotOpinion - Space Scooter
Sea Level, 101.3kPa, 15°C
Motor: Multiplex Permax 400 6V; 3026rpm/V; 0.7A no-load; 0.357 Ohms.
Battery: CBP1150; 7 cells; 1100mAh @ 1.2V; 0.0164 Ohms/cell.
Speed Control: Castle Creations Pixie 20P; 0.0025 Ohms; High rate.
Drive System: Space Scooter Drive; 9.5x6 (Pconst=1.31; Tconst=0.95) geared 3:1 (Eff=88%).
Airframe: Space Scooter; 17.8dm²; 578g; 32.5g/dm²; Cd=0.043; Cl=0.29; Clopt=0.49; Clmax=0.99.
Filter: 20A max (ESC).
Stats: 91 W/kg in; 44 W/kg out; 7.5m/s stall; 10.7m/s opt @ 84% (21:04, 32°C); 13.9m/s level; 0.91m/s @ 4.9°; -1.29m/s @ -6.9°.
Warning:
MotoCalc was unable to determine a throttle setting for hands-off cruise airspeed, so the best lift-to-drag ratio airspeed and throttle setting will be used instead.
Inability to determine a throttle setting for an airspeed usually means the model is not capable of reaching the required speed with the given power system, or the airfoil information has not been specified correctly.
Power System Notes:
The full-throttle motor current at the best lift-to-drag ratio airspeed (5.3A) falls between the motor's maximum efficiency current (3.7A) and its current at theoretical maximum output (10.2A), thus making effective use of the motor.
Possible Aerodynamic Problems:
The static pitch speed (11.9m/s) is much less than 2.5 times the stall speed (7.5m/s), which may result in reduced performance at typical flying speeds and a low maximum speed. This situation is usually acceptable for an electric sailplane.
Pitch speed can be increased by using a higher pitched and/or smaller diameter propeller, a lower gear ratio, a higher cell count, or some combination of these methods.
Aerodynamic Notes:
Due to some of the potential problems listed above, this model may require an experienced pilot.
The static thrust (249g) to weight (578g) ratio is 0.43:1, which will result in medium length take-off runs, and no difficulty taking off from grass surfaces (assuming sufficiently large wheels).
At the best lift-to-drag ratio airspeed, the excess-thrust (60g) to weight (578g) ratio is 0.1:1, which will give slow climbs and low acceleration. Some piloting experience would be beneficial.
General Notes:
This analysis is based on calculations that take motor heating effects into account.