Offshoreonly.com - Mercury Blackhawk drives

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I'd love to find a Blackhawk for my Sweet 16, but they are pretty rare and often too $ for what they are.

Quote:

Originally Posted by Smarty (Post 4103693)

I liked the Blackhawk when it came out, with dual prop for the single engine boats which is good engineering. What about this drive too? I know very little about it but seems provide the same function, low X dimension, dual props, not sure of the cost of this surface drive, the Weisman Hammerhead. I have always liked the engineering in the Weisman products,and the notion of creating new products, and the same can be said for the Blackhawk becasue when it came into the marketplace it was different, innovative, I like new ideas or existing ideas that have been re-engineered to work well.

https://www.youtube.com/user/weismannmarine

http://www.weismann.net/press%20page...annduoprop.htm

the blackhawk has a High X, according to Merc it need to be a minimum 2.5 inches above a standard bravo.

Quote:

Originally Posted by offshoredrillin (Post 4103761)

the blackhawk has a High X, according to Merc it need to be a minimum 2.5 inches above a standard bravo.

My nomenclature was wrong last night it was late when I was typing. Thank you for correcting me.

My brain had me wanting to say say a low center of gravity for engine placement due to the higher X-Dimension that was possible, sometimes the words in my brain come faster than my typing ability....not a low X-Dimension....that is just plain stupid on my behalf....at least it is a typo on something that is not critical in someone's life, but when I have typo on a motion or brief and don't catch it, than there is hell to pay. I need to hire you for my proofreader, you do an excellent job!

All that stuff Mercury put in that guide and they could have just said the bottom of the bullet needs to be no lower than the bottom of the hull. mercurys standard recommendation places the prop 8.25 deep the drive is 8.25 shorter than a Bravo, plus they want the X dimension 2.5 higher, The bullet has a 5" diameter so half is 2.5".

Btw an aeration tubes (like ones some run on some #6 and arneson drives) many times solve most of the issues associated with this drive. Helps plane off time, slows Idles speed, takes load off of the shifts, takes load off the drive when in the rough, when suddenly the props are monetarily submerged. When the props are surfacing the tube is just along for the ride but when tops of the blades are below the surface it allows props to pull air and across them and reduce load, and keep slip numbers more consistent. (when on plane/props surfacing they tend to have high slip numbers, but when submerged the are extremely low, this the root cause of alot of the issues.)

I had seen a few builds before where the tubes were added like that.

Quote:

Originally Posted by BlownScarabI (Post 4103596)

I would give you $1000. Would really like to have an extra set.

I appreciate the offer but I agreed to sell them to the first guy that asked. I actually have two $800.00 offers, so if the first guy does not have the cash it is not a problem. The first guy is local, so I do not have to ship the props. I believe that when he looks at them he will buy the props. I will let you know if the props become available.

Can a guy get 31p props for the Blackhawk?

Some boats benefit from two different pitches. Run two different pitch props.

Quote:

Originally Posted by SVL-WARLOCK (Post 4104272)

Some boats benefit from two different pitches. Run two different pitch props.

Can you give an example which pitch front and back and what boat?:confused: