Type Details

OTTFUR CW 300 AND CW 400

QUICK RELEASE UNITS

GENERAL INFORMATION

Full British Gliding Association approval for use in all installation compatible gliders on the UK Register was received in November 1998. Type approval has also been confirmed after trials by the Netherlands RLD.
CW300 and CW400 units are now fully operational in many types in the U.K and one CW300 C of G hook is now approaching 9000 launches in a K21 without fault.
The Ottfur CW300  and CW400 Series of glider Quick Release Units are direct developments of the original Patented Ottfur OM100 Series and as such utilise the same geometry and sub-assembly design as the original but have been re-cased to suit the modern gliders installation and launch requirements and are installation compatible with the Tost G73,  E75 units and Tost Launch Rings.

CW 300 SERIES

These are Centre of Gravity units designed to meet the requirements of JAR 22.  The unit has a five position drive system with the option of five different operating levers.  Connection to the glider operating cable is by two adjustable link plates.  The combination of the five position drive, five operating levers and adjustable link plates offers a wide range of installation options.  £219.00

CW 400 SERIES

These are nose mounted aero tow units designed to meet the requirements of JAR 22.  The unit has two lever options namely a fixed length fork ended lever or a three position drive system, similar to that fitted to the CW300 and which accepts any one of the five operating levers referred to above.  Connection to the glider operating cable is also by the two adjustable link plates.  £179.00

DESIGN CONCEPT

Extensive research into the problems experienced by users of existing types of quick release unit resulted in the selection of only high quality approved materials for the manufacture of the Ottfur CW Series, together with specialised heat treatment for specific sub-assemblies, professionally manufactured springs and the use of only approved hardware for its assembly.

Additionally the design concept included the following prime objectives:-

-maximising commonality of spares across the two types of unit.

-the provision of an appropriate maintenance capability to the 'in the field' user.

-to achieve a cost effective long service life with the overhaul life being determined by 'On Condition' inspection with a minimum of 5000 cycles for the CW300 before overhaul may be necessary and a minimum of 6500 cycles for the CW400.

DIMENSIONS

The decision to use only approved materials and hardware sourced in the UK together with the necessity to maintain commonality with the original OM Series Drawings, dictated the use of Imperial units for the design and manufacture of sub-assemblies of CW300  and CW400.

However the links plates and levers connecting the unit to the glider operating system are drilled to accept 5mm standard 8.8 bolts or 5mm Clevis Pins and mounting hole bushing is manufactured from seamless steel bushing stock with an internal diameter of 6mm (clearance fit).

OTTFUR RELEASE EXCHANGE SERVICE

OTTFUR OM SERIES