Nostrodamus
New member
I have a Volvo MD22 engine which was attached to a 120 saildrive leg.
The leg had to be replaced but it would appear that Volvo have changed the gear ratio’s on the leg making them difficult to find a prop that actually works. They no longer supply the 120 with the old gear ratio’s.
For the technical minded
Old leg gear ratio was 2.24:1
New leg ratio is 2.19:1
This does not seem a huge difference but in combination with the engine the specifications have caused huge problems in finding a prop that works anywhere near its optimum.
Several prop makers would not consider supplying a prop or I was told that they would perform badly.
One company did really try everything for me (Brunton’s). With their first prop the boat would not go in reverse.
They did exchange it for another prop design that has independent adjustments for pitch in forward and reverse. Now it is excellent in reverse but forward thrust is poor and I need to adjust the pitch. It is a compromise but it was the best solution at the time
Has anyone else heard of this problem or can anything else be done!
The leg had to be replaced but it would appear that Volvo have changed the gear ratio’s on the leg making them difficult to find a prop that actually works. They no longer supply the 120 with the old gear ratio’s.
For the technical minded
Old leg gear ratio was 2.24:1
New leg ratio is 2.19:1
This does not seem a huge difference but in combination with the engine the specifications have caused huge problems in finding a prop that works anywhere near its optimum.
Several prop makers would not consider supplying a prop or I was told that they would perform badly.
One company did really try everything for me (Brunton’s). With their first prop the boat would not go in reverse.
They did exchange it for another prop design that has independent adjustments for pitch in forward and reverse. Now it is excellent in reverse but forward thrust is poor and I need to adjust the pitch. It is a compromise but it was the best solution at the time
Has anyone else heard of this problem or can anything else be done!