one engine / twin drive setup???
is there ever been such a beast or has a branch from the crazy tree broken off and hit me in the head?
Just wondering if theres ever been a setup to hook up a twin drive setup to a single engin? I know that some of the drag boats use a gear system bt i was thinking about having forward and reverse capabilities and being able to still controll shifting of each drive sepperatly. Let me know :) |
Yes...Imco was working on one a while ago. I'm not sure what stage it's in right now, but a few magazines had pictures and an article on it a year or so ago. Seemed like a great concept, I suspect you'd beed big power though to spin the main transfer case as well as the two drives. Seemed like a good option for the 28' range boats.
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They tested a boat in Powerboat a few months ago with the IMCO setup.
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My uncle has one in his Dorado. It has a single volvo diesel and splits the power to twin volvo duo props. Might be good for a fishing boat, I don't see the application in the high performance world. What happens when one drive breaks and you put 100% of the power through the other drive? That's assuming the first one didn't lock up...
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Nordic has one of their 21' Blaze ski race boats equipped with the imco splitter system i believe. This is the boat in the ad that you see on the 2 page ad that you will see behind the front cover of many boat mags. I read a review of one about a year ago, but i cant for the life of me remember where. Their website www.nordicpowerboats.com has some pics of the boat, but none where you can really see the drives.
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Originally posted by Cord ..What happens when one drive breaks and you put 100% of the power through the other drive? That's assuming the first one didn't lock up... While we're at it, my vote would be for a single 1350 Lycoming and a pair of ASD6's in my 38 Formula. |
Not being too much of a smart ass, but if you had a single engine-single drive boat you would still be in the same situation - that is if you had a single engine-dual drive setup with a drive failure.
I like the idea of what IMCO is doing, eliminating the propellor torque, and balancing the torque is a good idea. The second drive also shares horsepower load, for example a singledrive setup may have a blower motor with 800 propshaft hp, with the dual drive each drive is now sharing the 800 hp (in theory 400 prop shaft hp per drive). I have never seen this application in person, as hopefully someone can give us an update on their experinence with this setup in a pleasure boat scenario. |
A few months ago someone posted a few photo's of Randy Davis' ski race boat with this set up: Paul Pfaff turbo motor, IMCO splitter and two IMCO/Bravo drives. If I remember correctly, the boat pulled the winning skiers at both the Nationals and Worlds Ski Races. Its a sure way of getting 1,000+ hp to the water without tearing up your drives every run. Its a perfect set up for hi hp/torque applications where two drives are preferred for speed, handling, docking and longevity...
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Does anybody know how much power loss there is with this unit? How many throttles would there be? If there are two for forward & reverse, which would control the rpms? I tried to find it on Imco's pathetic web site, but there is no mention of it. What a great concept though, you save money on the extra engine, but have the prop hook-up and reliability of two drives.
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There are a LOT of drag boats running single engine, twin props. they are the fastest drag boats on the planet and have no torque steer.
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