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Donzi Blackhawk
12-09-2003, 02:13 PM
I currently have one set of custom Blackhawk props for sale. They are 31 pitch with some of the cup actually cut away on the forward prop. This modification was made to Mercury Lake X specifications to help reduce the amount of bow lift the Blackhawk developes. Overall rpm and speed remained the same in my tests. I used these as spare props and are in very good condition. The photos show the modification and overall condition. The price for these props is $850.00 plus shipping. If you are interested, e-mail me at Donziengineer@yahoo.com http://www.donzi.net/photos/bniedospial211.jpg http://www.donzi.net/photos/bniedospial212.jpg

oldLenny
12-09-2003, 02:46 PM
Question, O.T.

The duo props (Volvo) don't care about the relationship (orientation) of the forward and rearward blades in relation to each other. The Blackhawk has these "locked" in a particular alignment does it not? Any why?

Greg Maier
12-09-2003, 06:08 PM
Lenny,

I talked to the guy at Hoss Props who made the prototype props for the Blackhawk (and by the way, will make custom BH props for a small fortune), and he said that the props are desgined to be timed. The front prop feeds the back prop. He said that the 31 inch props were designed to be 30 inches on the front and 32 inches on the back.