twin outboard spacing 34 x 12.5ft Silverton

Discussion in 'Powerboats' started by naturewaterboy, Jun 9, 2007.

  1. naturewaterboy
    Joined: Sep 2006
    Posts: 211
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    Location: key largo, florida, usa

    naturewaterboy Steel Drum Tuner

    I've talked to quite a few people all with different opinions about the effects of engine spacing. There are pros to narrow spacing (faster) and pros to wide spacing (more control at low speed).

    I believe that on a hi speed boat, a twin engine boat should have the engines close together. The boat will plane and the props will stay submerged with very little hull in the water.

    I'm putting outboards on a 34 ft. sportfisher (built with inboards) with a 12.5 ft beam - kind of a fat boat. I'm putting two 225hp Mercury Optimax on a Stainless Marine 30" setback bracket. The boat will have a displacement of about 12-13,000 lbs. when done. I'm not expecting to get a lot of speed out of it, but I certainly want the best efficiency, as I don't have an oil well in my backyard last time I checked.:D My bracket (I bought a used one) is a 4 engine design, so I can space the engines anywhere from the minimum spacing (about 26" I think) to 72". I'm hoping that if I put them at 72" this won't penalize efficiency. Any opinions on this?
     
  2. naturewaterboy
    Joined: Sep 2006
    Posts: 211
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: key largo, florida, usa

    naturewaterboy Steel Drum Tuner

    Stainless marine said I should space them at 72" as it would give better control and I wouldn't notice any performance difference from closer spacing.
     
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