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Towing Components

Cortland supply purpose built towing solutions for the uncompromising demands of the seismic industry. From standard fibres to high performance products with features and benefits perfectly for specific applications – Cortland tow ropes and complementary equipment are integral to the seismic array.

Super Wide Tow Ropes
Super Wide Tow Ropes

Probably the most critical rope within the seismic array, super wide tow ropes need to cope with high levels of tension-tension and cyclic bend fatigue. Two major elements to consider when choosing a super wide tow rope: 
Rope Construction  
This has to be a balance between efficient fiber use, flexibility, spliceability and total structural rope integrity. These factors are especially critical as ropes get larger to cope with the new types of paravanes coming onto the market. Cortland’s patented 12x12 rope construction offers an excellent balance of these factors. 
Cortland offers a variety of rope constructions and designs, either with or without jacketed and faired sections, created to suit specific configurations.  
Rope Material  
Cortland engineers its products with both high performance and standard fibers to offer customers the proper solutions. High performance fibers are generally limited to three major types, HMPE, liquid crystal polymer (LCP) and Aramids. HMPE has excellent fatigue and robustness properties; however it suffers from low heat tolerance. LCP provides good fatigue properties with excellent creep resistance. Aramids have excellent heat and creep resistance properties but do not perform as well in abrasion resistance, tension-tension and bend fatigue. 
Cortland has utilised the advantages of both HMPE and LCP to develop BOB® (Bend Optimised Braid) rope. This rope leads the way in deep water lifting applications where serious fatigue is induced by AHC (active heave compensation) units.

Deflector Straps
Deflector Straps

As seismic spreads are increasing, so are the required forces to achieve the separation. Position accuracy and long-term deployment exposure mean deflector straps need to be purpose designed and built. Cortland offers a full line of deflector straps specifically designed for seismic front-end requirements. Using our extensive experience, we carefully select a strap's fibre blend to maintain strength and resist both fatigue and creep. Cortland straps are available with fairing systems and also systems for improved cut resistance. These reduce strumming and oscillation during operation, and can include specified hardware as well as full traceability and material certification. 

  • Integrated PVC fairing 
  • Low friction material in eye pads to protect against wear and ensure movement on spools 
  • Blend of HMPE and Aramid load bearing 
  • Length tolerance : +/- 5mm 
  • Overbraided jacket to remove “slamming” and reduce abrasion 


  • Improved cut resistance 5-10x by additional synthetic armouring
  • Integrated backup strap 
  • Set of straps with stiffness optimized design for reduced fatigue exposure on deflector 
  • Fully proof load tested and certified, with "as built" length verification
Dilt Float (or Depth Ropes)
Dilt Float (or Depth Ropes)

Front End Ropes  
Whether it's separation ropes, spur lines, dilt float ropes, deflector lifting ropes or 3-eye splices, Cortland ropes are ready for deployment upon delivery. Braided or foiled fairings are also available and we can even create specialty ropes that achieve a combination of stretch and low elongation. 

Dilt Float Depth Ropes  
As the selection of streamer depths increases, it requires accurate and reliable depth tow ropes for the front end. By using dilt float straps from the Cortland family of products, the handling is very light reliable and efficient; and streamer noise is reduced by the faired systems.