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TROUBLE SHOOTING /
Helicopters /
直升機本體
Q: What would you do if there comes out a lot of
noise from the helicopter during flying?
A: a.Please check the gear mesh between the
main gear and the motor pinion. If there is too
much gear mesh, it would generate a lot of
gear noise during flying.
b.If the tail drive belt is too loose, it will bring
about some noise and may cause the failure
of tail control.
c.Check the linkages and control system of
main rotor and tail rotor to make sure every
linkage is working correctly and not colliding
with something else.
d.Check if the motor is running out of balance.
Motor, Battery and Speed Controller
Q: How to choose the motor and the pinion?
A: It depends on the battery and the motor. The
following is the formula of how to calculate the
wanted head speed.
Motor RPM = Motor KV x Volt(3.7V) x Series x
constant (0.8)
Head Speed = Motor RPM / Gear Ratio
Gear Ratio = 150T / Motor Pinion
Example:
We choose TT OBL 29/37-10H optional
brushless motor.
If using a 3S(11.1V) Li-Po battery, the motor rpm
should be
3700KV x 3.7V x 3S x 0.8=32856 rpm
And we expect to have the head speed of
2800~3000 rpm
32856 / Gear Ratio=2900
Gear Ratio=11.33
The pinion would be 150T/11.33=13.24
So we choose 13T as the motor pinion.
Q: 空中飛行時，機體發生過大噪音該如何排除問題？
A: a. 檢查主齒輪與馬達驅動齒間隙是否過大，過大的間
隙將於飛行時產生噪音。
b. 尾傳動皮帶是否過鬆？過鬆的皮帶會產生噪音與降
低尾舵效率。
c. 檢查主旋翼與尾旋翼所有控制連桿是否正常運作。
d. 檢查馬達動平衡是否正常。
/ 馬達、電池與速控器
Q: 該如何選擇適合的馬達與馬達驅動齒
A: 選擇馬達時應同時注意與速控器的搭配性，您可依
照下列公式計算出主旋翼轉速、馬達轉速與搭配的
齒輪比
馬達轉速＝馬達kv值×電壓（3.7v）×串聯電池數
主旋翼固定座轉速＝馬達轉數/齒輪比
齒輪比＝150T/ 馬達齒
實例一：
使用雷虎科技無刷馬達TT OBL 29/37-10H
搭配3S(11.1V)鋰聚電池
馬達轉速=3700KVX3.7VX3SX0.8=32856rpm
欲將主旋翼轉速控制在2800-3000rpm左右
主旋翼轉速=32856/齒輪比=2900
因此齒輪比需為11.33
150T/11.33=13.24
所以馬達齒使用13T
-41-
×常數（0.8）
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