Joe,

The timing number in the Hacker manual and web site says 25 degrees.

Bill,

The concept of the brake is to “not” stop the prop, rather to maintain a controlled rotation to create a large plate the diameter of the prop. With no brake, the prop will just windmill on downlines and continue to speed up. If the brake is set too high, the prop will do the opposite and come to a complete stop, again not creating the plate affect we want to slow the plane in downlines.

The brake will not engage if the ESC detects any input above the low throttle setting. In other words, to engage the brake the throttle has to be at zero with no idle trim. If you arm the ESC and then bump up the trim to an idle the brake will not set.

One test for brake strength is on landing. I don’t want to see the prop stopped on approach…just a bit of rotation on touchdown.

It’s a fine line. On my Q80, bumping up the brake by just 5% will stop the prop on downlines and it falls like a rock.