| 摘要 |
PURPOSE:To reduce the required time for testing while saving the expense, by providing a DC motor and an ammeter to reduce the frequency of air tunnel tests and the number of models thereof. CONSTITUTION:An air tunnel testing model 1, a DC motor 9, an ammeter 11 and the like are provided. Then, the DC motor 9 is used during an air tunnel test to rotate the model 1 at a fixed angular velocity of rotation. When current flowing through an armature of the motor 9 is measured with the ammeter 11, the rolling moment can be learned as it is proportional to the output torque of the motor 9. If the angular velocity of rotation of the model 1 is measured simultaneously, the roll damping can be found by a single test. This can reduce the frequency of air tunnel tests and the number of models thereby shortening the required time for testing as well as saving the expense. |
