Flexhook version 3

Flexhook mounted in a fuselage.

In this version the Hall Effect device has been moved forward onto the L-bracket and the lever carrying the magnet has been lengthened to match. Unlatch force is set at 7 kg. You can now see how the OLA lever magnet moves vertically past a Hall Effect sensor. There are several reasons for these changes:

• the movement amplification is bigger (the bigger the better) since the magnet is further away from the pivot point. The movement is now 3 to 5 mm, which makes for easier unlatch force adjustment.
• Allard hates moving electronics due to cable soldering joint failure. So this modification now allows for a static Hall element. In the old design the Hall was inside the orange swinging hook part.
• More wall thickness to fix a screw in for fixing the OLA Hall.

The L-bracket is secured to the wing mount using one single steel M3 screw so the complete hook can be removed in seconds. The hook moves only 2 mm between its Straight and Circle tow positions. A leaf spring, taken from an old Tomy timer, is mounted in the orange main part of the hook to push it back when the line is slack.