Has anyone tried these stainless steel propellers from Australia?
Traditionally inboards have used bronze or bronze alloys like Nibral because they are very soft and the prop will generally disintigrate if you hit something; protecting the shaft, strut transmission etc.
But the low elastic limits of these alloys also mean they will deflect/distort under load making them less efficient.
Stainless Steel is very strong with very high elastic limits which results in very little or no distortion or deflection. For every other type of boating stainless is the standard for high performance propellers.
The Solas propellers are also about 2/3 or less the price of a CNC Nibral.
In my case I have been boating on the same chain of lakes for 35 years. In all that time the rocks have not moved. Hitting something is not a concern.