DV Jammer

DV Jammer

The DV Jammer is a line holding device suitable for the extremely high loads of the high-tech

Dyneema lines as well as exceptional holding power on polyester ropes. Six models, for lines

ranging from 8 to 18 mm diameter, are available. This covers a wide range of boats up to

around 100 ft in length. DV Jammer sizes 8 and 10 have the same mounting pattern,

similarly sizes 12 – 14 and sizes 16 – 18.

DV – Double V-grip

The DV-grip is a locking system based on two opposing V shaped wedges, the result

is a 4 sides grip which provides additional benefits over traditional 2-sided grip line

stoppers: – Less line wear – Higher holding power – Smaller sizes and lower weight.

DV is a patent pending product by Antal srl, Padova, Italy.

Test results and max load

Test values were obtained on Dyneema lines with different covers: – Dyneema with

polyester cover – Dyneema with mixed Kevlar-polyester cover Results shown in the

lower graph correspond to the failure of the cover and the resulting core slippage.

Dyneema line with a Kevlar-Polyester cover provides much better test results than

the Dyneema line with a Polyester cover which performed poorly, with results even

below the simple polyester line (polyester cover and core).

Appropriate safety margins must be considered for the max loads. The suggested maximum

load limit is the limit of the line. Above values for max loads are not valid for Dyneema lines

with a polyester cover or for polyester lines with a lower breaking load value than the

recommended maximum load value. Tests with polyester lines (polyester core and cover) show

that the limits is the breaking load of the line itself, with values close to our max loads.