08 nov 2017 00:22
Du får også lige data for nummeret større Dualsky motor. Den er på 650W og vejer 165g. Maks hastighed er 21 m/s og ved 65% er flyvetiden max. 31 min.
MotOpinion - Volksplane VP-1
50m above Sea Level, 101,3kPa, 14,7°C
Motor: Dualsky XM3548CA-5; 850rpm/V; 1,87A no-load; 0,032 Ohms.
Battery: FlightPower 3700 (20C); 4 cells; 3700mAh @ 3,7V; 0,0037 Ohms/cell.
Speed Control: Dualsky XC-40-MR; 0,0042 Ohms; High rate.
Drive System: Volksplane VP-1; 11x6 (Pconst=1,31; Tconst=0,95) direct drive.
Airframe: Volksplane VP-1; 45dm²; 2789g; 62g/dm²; Cd=0,054; Cl=0,42; Clopt=0,66; Clmax=1,2.
Stats: 205 W/kg in; 166 W/kg out; 9,5m/s stall; 12,7m/s opt @ 62% (33:30, 37°C); 16m/s level @ 75% (24:05, 43°C); 5,57m/s @ 25,9°; -1,34m/s @ -6°.
Possible Power System Problems:
The static full-throttle current (40,7A) exceeds the capability of the specified speed control (40A), which will most likely damage it.
Current can be decreased by using fewer cells, a smaller diameter or lower pitched propeller, a higher gear ratio, or some combination of these methods.
Power System Notes:
The full-throttle motor current at the best lift-to-drag ratio airspeed (38A) falls approximately between the motor's maximum efficiency current (28,7A) and its current at theoretical maximum output (220,9A), thus making effective use of the motor.
The voltage (14V) exceeds 12V. Be sure the speed control is rated for at least the number of cells specified above.
Aerodynamic Notes:
The static pitch speed (25,8m/s) is within the range of approximately 2,5 to 3 times the model's stall speed (9,5m/s), which is considered ideal for good performance.
With a wing loading of 62g/dm², a model of this size will have trainer-like flying characteristics. It would make an ideal trainer, for use in calm to light wind conditions.
The static thrust (2089g) to weight (2789g) ratio is 0,75:1, which will result in very short take-off runs, no difficulty taking off from grass surfaces (assuming sufficiently large wheels), and steep climb-outs.
At the best lift-to-drag ratio airspeed, the excess-thrust (1229g) to weight (2789g) ratio is 0,44:1, which will give steep climbs and excellent acceleration. This model should be able to do consecutive loops, and has sufficient in-flight thrust for almost any aerobatic maneuver.
General Notes:
This analysis is based on calculations that take motor heating effects into account.
These calculations are based on mathematical models that may not account for all limitations of the components used. Always consult the power system component manufacturers to ensure that no limits (current, rpm, etc.) are being exceeded.
Har crashet både det ene og det andet, men er efterhånden gode venner med de fleste af mine fly.
Medlem af EFK87.