Jefa produces a wide range of standard rudder blades for boats from 22 to 75 feet length. This unique product line offers the boat builder a modern rudder blade without investing in expensive molds. The rudders are made in Jefa’s modern GRP factory and are available in many sizes depending on the boat size. What makes Jefa Rudder Blades unique and distinct from all other rudder blade producers and yard made rudder blades is the production in solid aluminum molds. This unique production method allows very high pressures to be used in the gluing and foaming process and results in an extremely precise shape. Traditional fiberglass molds don’t allow any pressure from inside the blade, so one can’t be sure of a good bonding of both sides and the final shape of the rudder. Jefa has delivered rudder stocks and complete rudders for 1,000’s of boats. Rudder stocks are available machined from stainless steel, or aluminum alloy. Rudders are laminated in female molds and filled with high density foam. Complete rudders are built to OEM specification or as replacement rudders for existing boats in a purpose built production facility allowing Jefa to deliver the highest quality rudders. RUDDER BLADES GRP Cruising and Racing Rudder Blades
Racing Rudders
Cruising Rudders
CONSTRUCTION The illustration on the right shows the way Jefa Rudder Blades are built. The blades are made of one layer of 300g chopped E-glass and 3 layers of 600g. The metal (Aluminum or Stainless Steel) rudder stock is MIG welded to the spokes which are glued to the rudder blade at each side. On top of that there is extra lamination at one side of 2 layers of 600g glass. This extra laminate is very important as any movement between the rudder stock and rudder blade is fatal for the lifetime of the rudder. All rudder blades comply to the ISO 12215-8 norm CE regulations. Please look further on the page for more detailed information on sizes, production methods and specials. All Jefa rudders are delivered in a gel coat finish and should be treated with non-water penetrable epoxy coating and anti-fouled. This will prevent water entering the gel coat and underlying GRP structure.
Glue polyester adhesive 1 layer 300g chopped E-glass 3 layers 600g chopped E-glass
Overlap
Glue
Rudderstock laminated to one side 2 layers 600g E-glass PU foam core 90 kg/m 3
Due to the high pressure foam filling system, the foam is guaranteed present in all areas of the blade so no air pockets can be present. Also visible is the large overlap at the front and the huge glue contact area at the aft side of the rudder blade.
Overlap
Spokes MIG point welded A5 to rudderstock
A unique feature of Jefa Rudders is the overlapping parts of the blades. This feature substantially strengthens the blade integrity, making it nearly impossible to split. Traditionally the rudder halves are glued heads on together, allowing only a very small contact area which causes the blade to split easily
Rudderstock glued to blade with polyester adhesive
Blade shells laminated 1 layer 600 E-glass Glue polyester adhesive
TO ORDER VISIT WWW.PYIINC.COM OR CALL 425-355-3669
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| JEFA RUDDER BLADES
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