Page 65 - Vetus

WATER LUBRICATED STERN GEAR

Water lubricated stern gear for wooden, steel or polyester (G.R.P.) vessels
VETUS is able to deliver stern gear assemblies directly from stock. Machining, threading and keyway cutting have all been
taken care of, so easy installation is guaranteed.

Specifications
• All VETUS propeller shafts are made of stainless steel type Duplex 1-4462, corrosion-free and with excellent running
properties in rubber bearings
• Dual shaft seal (eliminating the need for a stuffing box)
• A propeller nut with integrated zinc anode is supplied as standard
• Water lubricated
Inner bearing
(see page 72)
Mounting flange
(see page 73)

Propeller shaft
(see page 72)

Stern tube
(see page 74)

The VETUS flexible inner bearing
has dual sealing lips, as double security
against water leakage

Why Duplex 1-4462 instead of AISI 316 Example
All VETUS propeller shafts are made of stainless steel type Imagine, you have a shaft with a maximum shaft speed of
“Duplex 1- 4462”. In comparison with stainless steel 1400 r.p.m. and a diameter of 1 / 16” (30 mm). The diagram
3
materials like AISI 316 and Aquamet 17 or 22, the corrosion shows (blue line) that the maximum distance between
resistance of “Duplex 1-4462” is much greater. In addition 2 bearings amounts to 5 ft 3” (1600 mm).
the tensile strength of “Duplex 1-4462” is about 30% If you have a shaft of e.g. 4 ft 11 / 16” (1500 mm). length,
1
greater than AISI 316 and its hardness is approximately then one rubber bearing will be sufficient. Should you have
40% higher. It is precisely this high degree of hardness, a shaft of 6 ft 6 / 64” (2000 mm). length, in this case
47
which gives “Duplex 1-4462” its excellent running properties 2 rubber bearings have to be used. For shafts with a length
in rubber bearings. of 10 ft 6” (3200 mm) or longer, 3 bearings are needed.
Depending on shaft length, diameter and speed of rotation
(rpm), 1, 2 or 3 cutless bearings must be installed.

DUPLEX 1-4462 AISI 316 DUPLEX 1-4462
300 400 3500
kW hp
350
250 3000
Ø60 Ø50 300
200 Ø50 2500
Ø45 Ø45 250
150 Ø40 200 2000
Ø40
Ø35 150 Ø60
100 Ø35 1500 Ø50
Ø30 100 Ø45
Ø40
50 Ø30 1000 Ø35
50 Ø30
Ø25 Ø25 Ø25

500 1000 1500 2000 2500 3000 500 1000 1500 2000 2500 3000 3500
R.P.M. R.P.M.
Creators of Boat Systems 65