Mercury Blackhawk drives
04-09-2014 | 06:54 AM
#82
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Joined: Feb 2004
Posts: 12,314
Likes: 1,556
From: Maryland
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
https://www.youtube.com/user/weismannmarine
http://www.weismann.net/press%20page...annduoprop.htm
Last edited by offshoredrillin; 04-09-2014 at 06:57 AM.
04-09-2014 | 09:31 AM
#83
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Joined: Oct 2000
Posts: 2,796
Likes: 396
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!
Last edited by Smarty; 04-09-2014 at 11:18 AM.
04-09-2014 | 12:35 PM
#84
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Joined: Aug 2010
Posts: 659
Likes: 3
From: Brooklyn Park, MN
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.)
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.)
04-09-2014 | 05:05 PM
#86
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Joined: Jul 2012
Posts: 23
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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.
