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 Surface Drive Shaft Length 
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MMT Pro Member

Joined: Mon Feb 02, 2015 2:28 pm
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Post Surface Drive Shaft Length
Got a question for you guys running smaller size sd's. I am building my first surface drive and need to know the measurment from the back of the belt housing to the center of the prop.

I know there is probably alot of difference based on brand but the more info i can get the better.


Fri Nov 20, 2015 8:14 am
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Joined: Sun Aug 09, 2009 12:50 pm
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Location: Muscatine, Iowa
Post Re: Surface Drive Shaft Length
My son really likes his 40" shaft on his MB 7000, further prop is back of boat it will get better bite in less aerated water. Older MBs had 48" shafts on their Hyperdrives, I had a 2005, wished MB still offered a 48".


Fri Nov 20, 2015 7:06 pm
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Post Re: Surface Drive Shaft Length
Wow 40" is a lot longer than I expected. Do you have any idea what it would be on a mb mini? Or a copperhead? Copperhead would be similar to what I'm building.


Fri Nov 20, 2015 7:32 pm
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Location: Muscatine, Iowa
Post Re: Surface Drive Shaft Length


Fri Nov 20, 2015 7:47 pm
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Post Re: Surface Drive Shaft Length
Its a 16 hp duromax I bought on ebay. I built a longtail using it then just recently sold the frame so I could build a sd. I figure I will use this motor for now and eventually buy a 22/23hp honda or vangaurd.


Sat Nov 21, 2015 6:58 am
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Location: Hardin County, Tx
Post Re: Surface Drive Shaft Length
The GoDevils come with a 36" drive, works well in many types of conditions.

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Fri Nov 27, 2015 9:48 am
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Post Re: Surface Drive Shaft Length


Sat Nov 28, 2015 7:04 am
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Location: Hardin County, Tx
Post Re: Surface Drive Shaft Length
I'm not sure exactly how that's measured since the belt housing doesn't just stop where the belt and pullies are, there's a CV joint at the bottom also. This allows the engine and belt to run on a flat plane and the angle of the drive occur at the bottom.

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Sat Nov 28, 2015 11:16 am
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Joined: Sun Dec 21, 2014 4:07 pm
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Location: Batson, Texas
Post Re: Surface Drive Shaft Length
I researched it a while back and was told outdrives were measured from center of the pulley to center of prop. I built a 30" for my build and looked pretty proportionate


Thu Dec 03, 2015 6:11 pm
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Post Re: Surface Drive Shaft Length


Fri Dec 04, 2015 6:01 am
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Location: Batson, Texas
Post Re: Surface Drive Shaft Length
Kinda. I ended up not finishing it because other projects starting piling up around the house. And I started trying to do some side jobs. Here's the link.

viewtopic.php?t=59919

Plus I sold my long tail rig and missed a couple hunts because my buddy's merc didn't crank at the ramp so my wife said we need another boat.


Fri Dec 04, 2015 6:36 am
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Joined: Sun Dec 21, 2014 4:07 pm
Posts: 96
Location: Batson, Texas
Post Re: Surface Drive Shaft Length
Kinda. I ended up not finishing it because other projects starting piling up around the house. And I started trying to do some side jobs. Here's the link.

viewtopic.php?t=59919

Plus I sold my long tail rig and missed a couple hunts because my buddy's merc didn't crank at the ramp so my wife said we need another boat.


Fri Dec 04, 2015 6:36 am
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