Why clever only for #6?
03-09-2012, 03:38 PM
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You can get round ear high and low rake props for SSM drives. Rolla as mentioned makes them and a some others.The thing is, that on many high performace applications, they are not needed. Arneson and Weismann use them more often. Back in the day, it was not uncommon to see SSM#2 and SSM#3s with them - looks a bit like choppers sometimes. Not more than a few weeks ago, somebody posted a pic in a thread here with a set of #3s and round ear props. It all boils down to the application. Today you will mostly see them in yacht and big boat applications. Many manufactures, including Hering, Bblades ect. still round ears off on cleavers on different setups when needed.
Here is one on an ASD#10.
Here is one on an ASD#10.
03-09-2012, 03:51 PM
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Ha ha. That's Mike Avila's boat. Beautiful boat. Unfortunately the rules in Australia and world titles limit capacity to 572ci so he can only run it in USA. I know randy Davis of Nordic boats runs a single blown motor through a splitter box and out through twin imco drives on his ski race boat. Gives an awesome wash for the skiers.
03-09-2012, 03:59 PM
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03-09-2012, 04:12 PM
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03-09-2012, 10:50 PM
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Yea, running the chopper's part of the plan ..... It's about the speed, when your spending that kinda coin (#6's) your all in, I assume these are ventilated hulls, not really true V's where bow lift is needed for handling at speeds ..... Reducing the wetted surface, getting the azz up does lots more than ventilation, but it helps and together works in a combined effort to become a real Go Fast ...... Lol...
It's a trade off, tight turns are interesting ......
It's a trade off, tight turns are interesting ......
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03-10-2012, 03:52 AM
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Yea, running the chopper's part of the plan ..... It's about the speed, when your spending that kinda coin (#6's) your all in, I assume these are ventilated hulls, not really true V's where bow lift is needed for handling at speeds ..... Reducing the wetted surface, getting the azz up does lots more than ventilation, but it helps and together works in a combined effort to become a real Go Fast ...... Lol...
It's a trade off, tight turns are interesting ......
It's a trade off, tight turns are interesting ......
03-10-2012, 06:46 AM
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Pretty sure there is a ski race boat running a 1350/M8 combo, have seen vids of it on youtube. The number 8 drive probably runs the same prop selection as a 6, so it has been done. Boat was from down under too, maybe you could do some asking around about it.
03-10-2012, 07:08 AM
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Your best bet if you want a submerged prop is definetly a Konrad. It's sturdy as hel!, quite a bit more than a Bmax imo and cost less than half of a #6. They also run a tranny. You can also run an IMCO SCX, they will accept props up to 17" diameter of both Bravo and SSM style.
03-10-2012, 07:44 AM
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This question has always baffled me. Why are the only props available for merc #6 drives and now #8 also clever style propellors (or is someone making different styles I'm not aware of?).
My limited understanding of prop design was that clever style props offered little in the way of bow lift, and actually tended to lift the stern a touch. This is good for cats and hydro's but deep v boats require bow lift, hence the reason mercury makes a huge array of different style props for its outboard range to accommodate this.
I do understand rake can assist with bow lift and have noticed a lot of the 6 drive props incorporate this, just couldn't imagine the clever design being the answer for every application.
My limited understanding of prop design was that clever style props offered little in the way of bow lift, and actually tended to lift the stern a touch. This is good for cats and hydro's but deep v boats require bow lift, hence the reason mercury makes a huge array of different style props for its outboard range to accommodate this.
I do understand rake can assist with bow lift and have noticed a lot of the 6 drive props incorporate this, just couldn't imagine the clever design being the answer for every application.
Kurt,
Round ears are available but you usually need to request it. My Friend ( Check 300 ) has a single engine 30' Checkmate with a #6 drive running deep also with 1,500 hp.
Mercury originally made the prop for him and dialed it in until it ran right. He runs a 3 blade round ear, boat runs well over 100 mph.
I would also check with BBlade's to make something to meet your needs. If you talk with Brett he has the specs on this prop.
Jon
