Regardless of whether or not a linkage is "vertical", the output of a servo arm will only be linear when measured angularly. The school of thought behind the longer servo arms makes perfect sense, although, a thorough explanation would be pretty drawn out. If you look at a Sceadu EVO 50, you'll see that it employs the same idea on it's aileron linkage.
Study my illustration below and you should be able to visualize the advantages.
Naturally, a servo's output on a particular axis decreases exponentially near the extreme ends of its travel due to the fact that servo arms move in an arc. When you setup a machine so that at neutral, the servo arms form 90 degree angles with the linkages to the swash(IE Fig. 1&2), you'll see that the swash will be more active/sensitive around neutral and less so at the extremes. Now, when you setup a machine so that at neutral, the servo arms form angles LESS than 90 degrees with the linkages to the swash(IE Fig. 3&4), you'll find that overall, the swash movement will be more linear throughout it's range. The only issues with having longer arms is that your servos will be working harder and you'll loose resolution since you will need less travel.
In a DX7, the exp(exponential) function under the swash mix menu has a similar effect.
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发表于 2007-12-28 23:03
发表于 2007-12-28 23:50
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