It is important to configure the Aero Vang so you have correct line length to provide sufficient range. It is easy for the vang line and blocks to run out of range when the breeze picks up and you need to crank on the vang.
Conversely, it is easy to trim too much off the lines so that attaching the vang is difficult or impossible. Not an easy fix.
This post documents some measurements that seem to work well for vang setup for 5, 7 and 9 rigs.
The image above is taken in the max eased position. I have my vang stopper knot next to the cleat so the vang will ease no more than this picture depicts.
Notice that the vang secondard block abuts the primary block and the tertiary block abuts the secondary. This is how you want the cascade to appear in the max ease position. From here, you will have maximum range in strong breeze when pulling on the vang.
There are two key measurements:
From the mast to the bottom edge of the primary vang block: 110mm.
From the boom to the bottom edge of the secondary vang block: 720mm.
Dont Trim Too Early
Don't be too hasty to trim the tails of the primary and secondary lines. It may look neat, but if you make it too short, it is a difficult fix and requires replacing the vang primary and/or secondary line from the boom.
The various Aero rigs require slightly different vang line lengths. The 5 rig has the highest boom and thus requires a slightly longer vang primary line length. The 9 rig has the lowest boom and it requires the shortest primary length. The measurements above are configured to work for the 5 rig. If you don't have a 5 rig, you can probably tighten the lines a little.
Remember that the lines will stretch a little as the bed in for the first few times you sail your Aero. Thereafter, they should be stable.