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原帖由 maple 于 2010-2-28 17:45 发表 
I just don't care the difference between an engine and a motor. They are nothing to do about the topic what we argued about, but you tried hard to drag me into this. Truly, they are completely diffe ...
I am not sure what are you talking about, if the difference of engines and motors is neglected, how can we identify which one is more dangerous? As you can see, this is our topic. And as for the mentioned difference, What I have been talking about really matters.
An engine or a heatengine, as you know, has to work in a specific rotation rate in order to maintain the cycle, or Carnot cycle. This is the primary principle of a heatengine, and no matter how new an engine is, it can not violate the Carnot cycle.
The key here is that a heatengine can reach its max output only by runing in one fixed rpm-torque combination, any interruptions can easily kill it, thus it is an unstable system. This is why we introduced govenor and turn pipe to control the rpm.
In contrary, a motor is not restricted by the Carnot cycle, it can burst into its limit at any rpm, and sometimes unexpected. It is why I think an EP heli is more dangerous. For the GP ones, once the rpm got zero, there is no more danger, however, an EP is always a concern once it is plugged, you have to recheck and recheck again if the throttle is in the right position, and see if the Tho. Hold works properly.
Finally, providing the blades hit someone, the difference of GP and EP is that GP will cause immediate damage and then either the engine is killed, or the clutch looses. For the EP, it will not only cause immediate damage but also bring about continuous injury till the pilot stops it.
[ 本帖最后由 Edward 于 2010-2-28 20:54 编辑 ] |
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发表于 2010-2-28 17:45
