Tag Archives: Bow Thruster

Back to the bow

Here is the “Before” picture to this story below: I was going over the bow stem and I noticed what looked like a seam in the iron that looked pretty raggedy, so I decided to put a new pass of weld on top to smooth it out. Well wouldn’t you know that that one little [...]
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Getting crazy with the primer

So while I have been in the forward tank so much lately installing the bow thrusters, I decided to start putting a bit of Amercoat 235 light grey primer on top of the green Dimecote inorganic zinc primer. Just to brighten the place up! Doesn’t that really make the rivets and ribs look great? [...]
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Mounting the saddles

It was a gorgeous day out in the shipyard on Sunday with a stunning sunset. I spent most of the day finishing off the guards on the starboard side bowthruster penetrations and installing the saddles. I used 5200 sealant and bronze hardware to mount the bronze saddle to the steel tunnels. I made sure [...]
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Port side bowthruster guards

Now that the flanges are finished, I thought it might be a good idea to put some sort of guard on both sides of the tunnels. I toyed with the idea of welding tabs and then bolting in these horizontal bars, but that seemed like excessive work. I decided in the end to [...]
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Welding on the flanges

So I want to beef up the area where the tunnel tubes meet the hull plating so I am installing a doubler flange on each penetration. I had cut the tubes so they extended roughly 1/2 inch past the hull plating on each side. I then took some 3/8 inch thick plate and [...]
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Blast and primer the tunnel tubes

I primed the tubes and prepped the area where the flanges will be welded on using an inorganic zinc primer called Dimetcote.
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Cutting in the saddles for the bowthruster

Boy has the weather changed quick! 40 degrees F today with overcast skies and sprinkles. Just a taste of what is to come. Today I cut in the saddles for the bow thrusters into both tunnels. First is to make a template on paper of the cut (taped up on the steel in [...]
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Double piercing – more bowthruster installation

So here is the first tunnel cut flush to the hull. And here is what it looks like inside the forward tank looking down through the manhole. Everything looks to be lined up and square with the internal frames. Now to start the next one. This one has to be a minimum of 14″ forward [...]
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Piercing the nose

So I have been saving up to put in another steel order. I have four main projects that need more steel: - the bowthruster: I need 14 inch pipe to make the tunnel - the pipe raceway: I need two 15 foot long sections of flat plate and lots of angle - the keel cooler: I need [...]
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Sizing a hydraulic motor for the windlass

This is a follow-up to the post Sizing an anchor windlass where we calculated the mass that our anchor windlass must lift given the scope, chain and anchor sizes we are working with. The end result was that we needed to pull up 10,140 lbs. The following calculations were worked out and sent to me [...]
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Sizing a bow thruster

I am considering putting in a bow thruster.  This is a small propeller in a tunnel that is mounted in the nose of the boat.  It allows you to push the bow to either side.  Since this tugboat only has a single screw, it is going to be tricky to dock, especially with a wind [...]
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