Wärtsilä Built-Up Propellers (BUP)

The Wärtsilä Built-Up Propeller (BUP) is an attractive alternative for a monobloc propeller. The easily (de)mountable blades and the possibility of under water (de)mounting enable the propeller blades to be replaced or repaired without interruption to the normal operating service. The BUPs are supplied in stainless steel or bronze. Connection towards the propeller shaft is with a flange and fit bolts. Most BUPs are delivered with 4- and 5-blades propellers, but 6-bladed propellers can also be delivered on request. There are no propeller diameter or weight limits. The flush and compact hub design in combination with efficiency optimised propeller blades makes the BUP fit for applications where low fuel consumption is important.