PEKA - Knipprath
PEKA provided a range of after market multi-blade rotor heads that were very advanced and also did a Hughes 500 body made from Carbon fibre
This era enthused over multi-blade heads and yet 20 years later it was still as difficult and/or 'not popular'; that is until the electronic modules such as the 'V-bar' came on the scene.
PEKA Multi-blade head review - Direct from PEKA themselves. They make it sound so easy.........................
Four blade head experience - 1988 Build and flying a PEKA Hughes 500 / Heim mechanics / 4 blade head.