Schlüter Control Systems

Original Fixed Pitch Head (1972)

detail view.

Rotor head fitted to the first production model of the Cobra.  Fixed pitch teeter head without damping, fixed 'coning' angle and no flap or lead-lag facility.

Flapping Fixed Pitch Head (1973)

Kit view  Flapping 'S' head early version  Late version fitted with square blade holders.

Known as the 'S' rotor head.  An updated version of the original fixed pitch rotor head with pivoting blade holders in the vertical direction to allow the blades to 'take up' the natural coning angle depending upon the lift being generated and also to 'flap', depending upon cyclic lift variations as the blades move 'upwind' and then 'downwind'; no lead-lag facility.  Fitted to DS-22 and Gazelle.

Expert Head (1974)

The 'expert' head was Schlüter's first production rotor head with collective pitch control achieved by the raising the flybar up and down thus superimposing a collective input onto the Hiller operation of the flybar.  Collective range was not particularly large but at least now an approach to landing could be made without the inevitable reduction of rotor speed and controllability that was inherent with the fixed pitch layout. No lead-lag of flapping facility but fitted with teeter damping.  Available either as standard or an upgrade for the earlier models i.e. Cobra, DS-22, Gazelle then later being supplied as the 'standard' head for the Gazelle.

Heli-Baby head (1975)

Fixed pitch 'teeter' head without damping and a simplified version of the original 1972 fixed pitch head with ball bearings fitted to the cyclic movement but brass bushes only for the teeter bearings.  With fixed coning angle and no lead-lag or flap facility.

Heli-Baby head (1976)

Uprated version of the Heli-Baby 1975 head incorporating lead-lag.

Super Heli-Baby head (1976)

Collective control by a rod running in a sleeve up the main mast and moving the mixer block position above the flybar linkage driver.  Linkages connected this block to both the main blades and flybar thus collective control was 'superimposed' on the flybar cyclic movement (Hiller only).  No lead-lag or flapping facility but had slight teeter movement restrained by sleeves.

Bell 222 head (1977)

fitted to Bell 222  fitted to Heli-Baby 

Upgraded Heli-Baby collective pitch head moving the 'mixer' block onto the flybar itself thus removing the need for two sets of long linkages giving a much tidier layout.  Operation remained the same with 'Hiller' cyclic control and no lead-lag or flap facility.

Heli-Boy heads (1978)

Updated version of the 1973 fixed pitch flapping head incorporating lead-lag hinges.

Updated version of the 1977 Bell 222 head incorporating mixing levers on main blade blade control arms with linkages to both the flybar and the swashplate thus superimposing direct swashplate control onto the 'Hiller - collective' control.  Generically known as a 'Bell-Hiller' collective pitch head, teeter damping but no lead-lag or flap facility.

System 80 Collective head (1979)

Updated version of the 1978 Bell 222 now having lead-lag facility with teeter damping but no flap facility.

Schlüter system 80 build instructions  -  German with pictures.

Schlüter system 80 build instructions  -  English without pictures.

Four Blade 'scale' head (1979)

Developed for the Schlüter system 80 rotor head system and weighted blades.

Top of Page        (VRHC - Vintage Radio controlled HeliCopters)