Now install the air cylinder for
the speed brakes.
Locate the position in the top
rear corner of the frame.
Reinforce this area with thin
plywood from the back side,
and mount the cylinder with
sheet metal screws. Note, that
the cylinder is pointed a little bit
downwards, so you will have to
use a little balsa wood triangle
as a spacer.
In general, the sloppier this
mount is, the better it will work.
Don’t worry about clearance in
this mount, as the cylinder also
must move slightly up and
down, not only in and out.
Install the ball link to the push
rod, and adjust and confirm the
correct length.
The speed brakes should open
approx 45 deg. So you
determine the fix point where
to mount the ball of the ball link
inside the door. Reinforce this
area with another balsa block
and mount the ball with a small
sheet metal screws.
After the movement is
confirmed, harden the area
where the ball is mounted with
thin CA glue.
See the bottom photo for
further reference.
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