The elastic strap is a bit of a mystery for most owners, basically it's
used to compensate for the weight of the elevators so you get a more
neutral feel in flight and when parked the elevators don't hang down
like some other aircraft.
The bungee is used doubled over and is passed through the horn and then
back along the elevator tube, we mount ours with cable ties as you can
slide (with effort) them up and down the tube for fine tuning. If they
are attached with hose clamps you have to take the fastback fabric off
to get in to adjust the bungee.
If the bungee is too tight the plane will want to keep climbing as it
pulls the control sticks back, to loose and you will need trim to fly
level, just right and it's perfectly balanced for extended hands off
flying.
When adjusting the cord move it about 50 mm at a time until close and
then 25 mm for final adjustment. The cord will need replacing every 18
to 24 months.
Thanks Michael Coates - X-Air Australia
