mwarren400:
Guess I am ignorant regarding matchboxes and our computer radios in general. Just what does a matchbox do that the radio using end pont adjustments do not do? Useing a JR matchbox and dual elevators, I positioned two lazer pens on each side. locateing them to converge on a + on a wall about 8' away. Useing the matchbox, I then matched the servo travel to identical endpoints projected on the wall. The projected wall locations are about 2,000% more accurate than just measuring at the control surface due to angles and distance of the projection. With the elevators centered at nutural, the end points were adjusted to the same location on a stickup on the wall with a + mark. So, at this time, I assumed the elevator positions at any point from nutural to the end would travel the same. They did NOT, by a bunch. Why, the geometry of the servo arms, control surface horns and angles were not identical. The only way I could get the control surfaces moving in the same manner at any point through the travel was to make templates of the servo location on one side, make the other side identical from the template, relocate one of the horns on the elevator halfs from a template made from one side. Once the geometry of servo location and elevator horns , and pushrods were made the same, and mechanically centered, the elevators traveled through the servo stroke equally with the match box removed. In looking at the overall value of the matchbox and transmitter programs provided by my 10 X, the matchbox was worthless. Assumeing you use 3 or 4 servos on the same control surface, the geometric setup must be identical, otherwise the servos will be fighting each other through the stroke, negateing the value of the system. Other than a convenient connection location that could have been acomplished with a Y harness, what is the real value of the matchboxes, or have I missed something here?