Re: Affect of a SS prop over alum with 25hp
Unless you compare same brand and model, you can not tell. Generally speaking, a stainless in the same size, brand, and model will turn a bit faster than aluminum because of the polish and blade thinness.
However, an example: A Ballistic stainless prop because of the aggressive rake and cup, plus generous blade area will turn slower than a stock aluminum prop and yet possible give the same or greater speed.
And, as stated above: Some well made aluminum props will deliver stainless like performance.