Equal Throw Method II (Collective Linkage)
Applications
2007 Jul 3
Table of Contents:
Understanding the Equal Throw Method:
*** Remove the ball link from the pitch control arm when performing the Equal Throw Method ***
Typical Mechanical Layout
Figure A is a Typical Diagram of the collective mechanical layout.
In order to set the collective linkage rod, we must understand the "Equal Throw Method".
The term "Equal Throw" can be define has having an equal amount of throw from each side of center.
Study the diagrams in Figure B through E. This will aid you in understanding the Equal Throw setup and a setup that is Not an Equal Throw.
Understanding the Equal Throw Method will simplify the collective linkage rod adjustment.
Example 1: Equal Throw
Increase the radio's End Points to align the servo ball to center of ball link. Maintain an End Point value between 90% to 110%.
The diagram in Figure B shows the ball on the pitch control arm is at EQUAL distance from the CENTER of the linkage rod's ball link when the collective stick is at it's low and high stick position.
Note one side of the servo ball near the top of the ball link when the stick is at low stick position.
The opposite side of the servo ball will be near the bottom of the ball link when the stick is at high stick position.
Hence the term "Equal Throw".
In Figure B, we would increase the radio's end point adjustments to get the linkage rod's ball link to align with the center of the pitch control arm's ball.
Move the servo ball in or out on the servo control arm to maintain an End Point value between 90% to 110%.
Example 2: NOT Equal Throw
Shorten the linkage rod length to balance the mechanical error. Redo the Equal Throw Method and adjust the radio's end point value.
Maintain an End Point value between 90% to 110%.
Now let's examine a scenario where the balls are NOT at equal throws.
In Figure C, you can see that the pitch control arm's ball is NOT equally centered on both sides of the linkage rod ball link's center.
Note that at low and high stick position, the ball is located at the bottom of the ball link.
If we were to adjust the radio's end point values so that the ball is aligned on the center of the linkage rod's ball link at full low and high stick position, we will have a setup that has different end point values.
Balance the mechanical error by shortening the linkage rod.
Recheck for Equal Throw and adjust the radio's end point value.
Example 3: NOT Equal Throw
Lengthen the linkage rod length to balance the mechanical error. Redo the Equal Throw Method and sd just the radio's end point value.
Maintain an End Point value between 90% to 110%.
Figure D shows another variation of a Not equal throw that will yield a radio end point value that are Not equal.
This mechanical error is just the opposite of Example 2.
To balance the error, lengthen the linkage rod and recheck for Equal Throw.
Adjust the radio's end point value to align the ball to the center of the ball link.
Example 4: Equal Throw Final Adjustment
Linkage adjusted for Equal Throw yielding an end point value between 90% to 110%.
The end points have been adjusted EQUALLY, and you will note that the pitch control arm's ball is aligned at the center point of the linkage rod's ball link at full low and high stick position.
The servo ball is mounted on the servo arm to yield an End Point value between 90% to 110%.
This technique can be applied to any mechanical system.
Understanding the Equal Throw Method will provide a symmetrical mechanical setup.
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