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Compliments to Cannonball! First in Palma Vela - Mini Maxi..... 
Mast Jack

Mast jack cylinders are used to pre-tension the rig. Cariboni-Caritec designs and produces stainless steel mast jack cylinders to be integrated in the mast base.
They can be placed in standard position (rod inside the boom and the tube placed on a permanent base) or upside down as usual thanks to the lateral pressure fitting.

Cariboni-Caritec’s mast-jack cylinders are usually made on 17-4 PH stainless steel and design to work at 700 bar (10.000 PSI): Caritec compact manual panel is available to drive the cylinder.

Aluminum lightweight mast jack cylinders are available for race sailing yachts.
Custom model available on demand.

 
modelworking load
kg - lb
stroke
mm - in
outside ¿
mm - in
rod ¿
mm - in
bore
mm - in
working pressure
bar - psi
notespdfpdfigs
CL 060 S 004020000 - 787.4040 - 1.5785 - 3.3556 - 2.2060 - 2.36700 - 10153Aluminium.
Weight: 4kg
CL 080 S 012535000 - 1377.95125 - 4.92100 - 3.9460 - 2.3680 - 3.15700 - 1015317-4 PH steel
CL 100 S 009055000 - 2165.3590 - 3.54130 - 5.1280 - 3.15100 - 3.94700 - 1015317-4 PH steel

NO DATASHEET AVAILABLE