betmanofbmw 在 2005-7-1 08:22 发表:
从MS官方网站的说法，尾舵机速度低于0。11S/60的话，磨损速度会非常快，文中没有给出更详细的解释，呵呵，很多模友以为我没事找事，我也懒得说免得讨人嫌，不过既然你碰到这个问题，就告诉你，信不信在你了。
Th ...
感谢betmanofbmw大大提供的信息。值得各位模友关注，我想模友应该理智面对这样的技术评测。下面是全部的原文，各位有兴趣可以看看
Article 044.002 - posted 5/29/05
Issue: How to know when a tail servo is about to fail?
Care must be taken when experimenting with a new tail rotor servo that has specifications that it might be suitable for the use on the rudder of a helicopter. It may rated as fast and is ball bearing, but that does not really tell us anything. If operated on a rate mode gyro (not heading hold) then this servo may perform quite well, but our discussions here are for tail servos specifically used with the MS044 Heading Lock gyro. Typically micro tail rotor servos will follow two paths when used with heading lock gyros, they will either burn up in less than 5 flights which is a clear indicator that the servo is not compatible or they will work reliably for some time period before showing signs of imminent servo failure.
The tell tail signs that your tail servo is near failure will be noticed as gain adjustments are needed on the gyro or the tail starts kicking out (holding ok, then a sudden rotation or complete piroette before the gyro catches again) and you have checked that nothing else has changed (the pushrod is still tight, the servo is still firmly mounted on the helicopter, the helicopter's tail control system is tight, the tail gears are not slipping on the tail drive shaft) it is time to change the servo as you are on the brink of complete servo failure. To know for sure that a servo is failing, hover the helicopter for a full minute, land and check the case temperature of the servo. Commonly the servo will get quite hot before it fails outright. This pending failure can also be measured in an increase in current draw from the servo, but this is much harder to identify in flight without some type of amperage meter installed, so we rely on a decrease in performance of the servo as a baseline criteria to replace it.
In summary, the servos that we use on our micro helicopters are really not suited for use with heading lock gyros and we have not influenced the radio and servo manufacturers enough to produce a high quality servo. Likely, the predominant reason is the low volume of consumers who would pay $80-$100 for a digital micro servo is not attractive to the servo manufacturers. As consumers, we know that the first servo company that produces a reliable digital micro servo is sitting on a gold mine with the huge volumes in micro helicopter sales. |
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发表于 2005-7-1 02:08
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