thibaultron

Here's another set on dredging, taken in 1991. Thanks for the first link Frank!
 

Kevin;
  I read the section in Chappelle's Small Craft book, on the skipjack "Messenger". The skipjacks with wells, did mount the winches on the main deck, according to Chappelle, just abaft the cabin. The crew stood in the well, and cranked it from there. So the shorter winch shown in the fisheries plate, would be correct for this type of skipjack.
 
 

Kevin;
  I read the section in Chappelle's Small Craft book, on the skipjack "Messenger". The skipjacks with wells, did mount the winches on the main deck, according to Chappelle, just abaft the cabin. The crew stood in the well, and cranked it from there. So the shorter winch shown in the fisheries plate, would be correct for this type of skipjack.
 
 

Part 12
 
Now on to the new bowsprit.
 
I glued the pattern of the top of the sprit, and disk and hand sanded one side.
 

 
Then repeated this for the other side.
 

 
I then glued patterns to the other three sides. The side view pattern is shown below.
 

 
I then shaped the top and bottom of the areas.
 
Next the part was clamped in a small vise, and I beveled the first corner, using a new Xacto blade as a scraper. I watched both sides of the bowsprit to get it even. A little touchup with sandpaper and I was ready for the other corners.
 

 
Here is the bowsprit beveled on all corners.  The transitions from the square to octagonal sections are now even, and where they a suppose to be.
 
The patterns were then sanded off, and using a piece of sandpaper held in my fingers I rounded the end of the part.
 
Below are two pictures of the bowsprit placed on the boat.
 

 

 
Here is a comparison photo of what the old bowsprit looked like when placed on the boat.
 

 
That is just the tip of my finger shown in the photo. The model is small, and this is fiddly work.
 
Next I printed out draft copies of the trailboard, and glued them to the hull. I glued them on in position, so that I could see if they fit, after all this, and so I can locate the position of the molding that goes above and below the trailboards.
 

 
As you can see I still have a little shaping of the stem below the trailboards to do. I did not notice this until I saw this photo. The area where the stem turns to go down the front of the hull is not completely even. The divot on the bottom  at the forward end is the paper of the starboard trailboard. I left the molding border on that one.
 

 
It will probably be a couple weeks before the next installment. I have other, non ship building, commitments.

I found a short video from the '50s about oyster harvesting, showing the use of the drudge.  Thought you all might be interested in it.
 

Part 11C
 
Now I’ll do this again, but with the left hand extrusion vertical, as in the original curve setup.
 
Follow me creates this new extrusion.
 

 
Again the left hand end, is not in line with the original surface.
 
Upright Extrude gives this.
 

 
Notice that without the second extrusion to mate to, the right-hand end finishes at an angle not at a right angle to the last line.

Part 11B
 
Using Follow Me, gives the results below.
 

 

 
The sections produced flow evenly along the path. The original surface is gone, if it were there, there should be a vertical joint, in the above view off to the right bottom, of the ring.
 
The Upright Extruder produces this.
 

 

 
The sections are fairly even, but titled at an angle to the path. Were the original surface was, there is a distorted section, filling in the ring, and a missing surface. The missing surface is not typical of this process, but does pop up now and then, as explained in previous posts.
 
Let’s take a closer look at how the curved extrusions are created.
 
First a tip. If SketchUp makes a curved path that is all one piece and you only need a part of it, you can break up the curve into individual lines, then work on them separately.
 
Select the curve, then right click on it.
 

 
Select the Explode Curve option from the menu. The curve is now a set of lines, that you can edit individually.
 

 
Now I’ll shorten the path, and we will look at how the two different extrude operations work.
 

 
This is the Follow Me result.
 

 
Once again the sections are even and align with the path, but there is a change in the position of the first (lower left) surface orientation. Remember that the surface we wanted to extrude was parallel to the green axis, but the first surface on the extrusion is angled away from the axis.
 

 
The first and last faces have been set at right angles to the ends of the path, rather than starting with the original surface, a new one has been generated. The intermediate surfaces, have been set so as to split the angle between the lines, at the joints. The cross section of the extrusion is circular, however.
 
The result of the Upright Extruder  is shown below.
 

 
The intermediate surfaces are at a different angle than for the Follow Me. The first surface, however is in line with the original surface. The last surface is also not at a right angle to the last line.
 
This is a view of just the surfaces, like we saw for the Follow Me version, for comparison.
 

 
The cross section of the extrusion, is also not quite circular.
 
Next We’ll try to connect to extrusions that have the end surfaces aligned like the Follow Me uses (right angle to the end of the line.
 

 
The Follow Me extrusion.
 

 
Even Sections were created.
 
Now the Upright Extrude.
 

 
Interestingly, the Upright Extrude correctly connected the right hand end, even though it was not in the same plain, than just extruding the surfaces without the end extrusions to connect to. This will not be true if the angle is too different.

Part 11A
 
Part 12 will discuss the winch drawing, promise. I’m already writing it up.
 
I think a more detailed explanation of how the Follow Me and Upright Extruder work is needed. I will use some example extrusions to show the differences.
 
First the Up Right extruder cannot do an extrusions for a path with a sharp angle in it.
 
The first examples are the results of trying to extrude a face, with a 90 degree bend in it.
 

 
For the Follow Me
 

 
And for the Upright Extruder
 

 
Because the Upright Extruder was trying to keep the faces parallel to the original, it was unable to turn the 90 degree corner.
 
If I angle the vertical line just a little, the Upright Extruder, can create an extrusion, but it is distorted.
 

 

 

 
Angling the line a bit more results in a fuller vertical shape, but still oval in cross section.
 

 

 
While the Follow Me gives us a circular vertical cross section.
 

 
The follow Me can also do the extrusion of an acute angle.
 

 

 
Now we’ll take a look at what happens when you extrude along a circular path.
 

 
The surface is not in line with the path, it was drawn along the green (Z) axis, to demonstrate the differences.
 

 

 
The picture below shows the extrusion path, in blue.
 

 

Part 11B
 
Using Follow Me, gives the results below.
 

 

 
The sections produced flow evenly along the path. The original surface is gone, if it were there, there should be a vertical joint, in the above view off to the right bottom, of the ring.
 
The Upright Extruder produces this.
 

 

 
The sections are fairly even, but titled at an angle to the path. Were the original surface was, there is a distorted section, filling in the ring, and a missing surface. The missing surface is not typical of this process, but does pop up now and then, as explained in previous posts.
 
Let’s take a closer look at how the curved extrusions are created.
 
First a tip. If SketchUp makes a curved path that is all one piece and you only need a part of it, you can break up the curve into individual lines, then work on them separately.
 
Select the curve, then right click on it.
 

 
Select the Explode Curve option from the menu. The curve is now a set of lines, that you can edit individually.
 

 
Now I’ll shorten the path, and we will look at how the two different extrude operations work.
 

 
This is the Follow Me result.
 

 
Once again the sections are even and align with the path, but there is a change in the position of the first (lower left) surface orientation. Remember that the surface we wanted to extrude was parallel to the green axis, but the first surface on the extrusion is angled away from the axis.
 

 
The first and last faces have been set at right angles to the ends of the path, rather than starting with the original surface, a new one has been generated. The intermediate surfaces, have been set so as to split the angle between the lines, at the joints. The cross section of the extrusion is circular, however.
 
The result of the Upright Extruder  is shown below.
 

 
The intermediate surfaces are at a different angle than for the Follow Me. The first surface, however is in line with the original surface. The last surface is also not at a right angle to the last line.
 
This is a view of just the surfaces, like we saw for the Follow Me version, for comparison.
 

 
The cross section of the extrusion, is also not quite circular.
 
Next We’ll try to connect to extrusions that have the end surfaces aligned like the Follow Me uses (right angle to the end of the line.
 

 
The Follow Me extrusion.
 

 
Even Sections were created.
 
Now the Upright Extrude.
 

 
Interestingly, the Upright Extrude correctly connected the right hand end, even though it was not in the same plain, than just extruding the surfaces without the end extrusions to connect to. This will not be true if the angle is too different.

Part 11C
 
Now I’ll do this again, but with the left hand extrusion vertical, as in the original curve setup.
 
Follow me creates this new extrusion.
 

 
Again the left hand end, is not in line with the original surface.
 
Upright Extrude gives this.
 

 
Notice that without the second extrusion to mate to, the right-hand end finishes at an angle not at a right angle to the last line.

Part 11C
 
Now I’ll do this again, but with the left hand extrusion vertical, as in the original curve setup.
 
Follow me creates this new extrusion.
 

 
Again the left hand end, is not in line with the original surface.
 
Upright Extrude gives this.
 

 
Notice that without the second extrusion to mate to, the right-hand end finishes at an angle not at a right angle to the last line.

Part 11B
 
Using Follow Me, gives the results below.
 

 

 
The sections produced flow evenly along the path. The original surface is gone, if it were there, there should be a vertical joint, in the above view off to the right bottom, of the ring.
 
The Upright Extruder produces this.
 

 

 
The sections are fairly even, but titled at an angle to the path. Were the original surface was, there is a distorted section, filling in the ring, and a missing surface. The missing surface is not typical of this process, but does pop up now and then, as explained in previous posts.
 
Let’s take a closer look at how the curved extrusions are created.
 
First a tip. If SketchUp makes a curved path that is all one piece and you only need a part of it, you can break up the curve into individual lines, then work on them separately.
 
Select the curve, then right click on it.
 

 
Select the Explode Curve option from the menu. The curve is now a set of lines, that you can edit individually.
 

 
Now I’ll shorten the path, and we will look at how the two different extrude operations work.
 

 
This is the Follow Me result.
 

 
Once again the sections are even and align with the path, but there is a change in the position of the first (lower left) surface orientation. Remember that the surface we wanted to extrude was parallel to the green axis, but the first surface on the extrusion is angled away from the axis.
 

 
The first and last faces have been set at right angles to the ends of the path, rather than starting with the original surface, a new one has been generated. The intermediate surfaces, have been set so as to split the angle between the lines, at the joints. The cross section of the extrusion is circular, however.
 
The result of the Upright Extruder  is shown below.
 

 
The intermediate surfaces are at a different angle than for the Follow Me. The first surface, however is in line with the original surface. The last surface is also not at a right angle to the last line.
 
This is a view of just the surfaces, like we saw for the Follow Me version, for comparison.
 

 
The cross section of the extrusion, is also not quite circular.
 
Next We’ll try to connect to extrusions that have the end surfaces aligned like the Follow Me uses (right angle to the end of the line.
 

 
The Follow Me extrusion.
 

 
Even Sections were created.
 
Now the Upright Extrude.
 

 
Interestingly, the Upright Extrude correctly connected the right hand end, even though it was not in the same plain, than just extruding the surfaces without the end extrusions to connect to. This will not be true if the angle is too different.

Part 11A
 
Part 12 will discuss the winch drawing, promise. I’m already writing it up.
 
I think a more detailed explanation of how the Follow Me and Upright Extruder work is needed. I will use some example extrusions to show the differences.
 
First the Up Right extruder cannot do an extrusions for a path with a sharp angle in it.
 
The first examples are the results of trying to extrude a face, with a 90 degree bend in it.
 

 
For the Follow Me
 

 
And for the Upright Extruder
 

 
Because the Upright Extruder was trying to keep the faces parallel to the original, it was unable to turn the 90 degree corner.
 
If I angle the vertical line just a little, the Upright Extruder, can create an extrusion, but it is distorted.
 

 

 

 
Angling the line a bit more results in a fuller vertical shape, but still oval in cross section.
 

 

 
While the Follow Me gives us a circular vertical cross section.
 

 
The follow Me can also do the extrusion of an acute angle.
 

 

 
Now we’ll take a look at what happens when you extrude along a circular path.
 

 
The surface is not in line with the path, it was drawn along the green (Z) axis, to demonstrate the differences.
 

 

 
The picture below shows the extrusion path, in blue.
 

 

Part 11C
 
Now I’ll do this again, but with the left hand extrusion vertical, as in the original curve setup.
 
Follow me creates this new extrusion.
 

 
Again the left hand end, is not in line with the original surface.
 
Upright Extrude gives this.
 

 
Notice that without the second extrusion to mate to, the right-hand end finishes at an angle not at a right angle to the last line.

Try sending a PM to MSW member MrBlueJacket (BJ's owner).

I've tried emailing with no response. Dumas don't even make their kit any more. I'll give it a try though.

Why not call them and ask? US manuf. , at least seem to be cooperative in such maters.

Why not call them and ask? US manuf. , at least seem to be cooperative in such maters.

They are, in my Carrie Price build log.

Crackers, both the subjects of the tutorial, are detail parts for two of my ship models.

Crackers, both the subjects of the tutorial, are detail parts for two of my ship models.

Thank you!

Yes the next couple of weeks will be bad. A friend in Florida died last week, and we are going down to bring her dog to live with us.
 
Next Tuesday, my Sister-In-Law goes in for cancer surgery.

Part 09A
 
Mirroring An Object
 
I have a bone to pick with SketchUp. Most every other program I’ve ever used, has used some form of the word ”Mirror”, in the command to create a mirrored image of an object. Not SketchUp, they use “Flip”, which, to me, means turn over like a pancake, while keeping it the same. Their explanation of “Flip” sounds like they were trying to explain it, and the word Mirror was patented, and they had to avoid it like the plague.
 
Just be aware.
 
Making A New Nose For The Frame
 
I will show all, or at least most, of the steps to create the new nose piece. There are lots of good techniques shown. Because of this it will be a very long post, but bear with me.
 
In the end after writing this section, it has to be posted in 5 parts, A through E
 
Now, last time I told you that I was throwing away all the work I did on the welded nose of the frame, and starting over. When I drew the frames, I started with the main body flat, and angled up the nose. I tried to make the tip curve in one direction, while remaining straight in the other. Well, my geometry calculations were off. When I went to paste the two sides, together, the tips curved away from each other, rather than running alongside. In order to get them to form a mass, they overlapped so much, the nose became only a single frame thickness wide, rather than two.
 

 
Then it hit me, angle the frames and draw the curve on the flat horizontal surface! So that is what I did.
 
This time instead of two cylinders I made the extrusion one solid piece.
 
To do this I went back to the flat frames I’d started with, before angling the tips, rotated them and combined them, into the proper configuration. I used the straight frame sides, so that I could get the proper flat curve, for the nose. You will see what I mean later.
 

 

 
Then I drew in a rectangle where the upper frame leg cylinders just met, to use as the line to cut the tips from the frame.
 

 

 
Notice, above, that the larger diameter lower frame leg cylinders connect before the joint on the smaller upper ones. This will come into play later in this process.
 

 
The upper and lower rods are a single cylinder were the joint will be. I cannot erase the left side on the tip end, without erasing the portion on the right. To solve this I needed to cut the frame cylinders where they meet the rectangle surface.
 
This is what happens if I do not cut the surfaces that cross the rectangle’s surface.
 

 

 
There is a function  Edit – Intersect Faces. That can be used to do this. When you intersect the faces, all the flat surfaces that cross the rectangle, or any other type of surface you choose, are cut in two, forming two new surfaces. This acts like a saw, cutting through the part.
 
First I selected the area I wanted to work on (including the rectangle). Then I choose the command.
 

 

 
Now when I select a surface on the left hand side, it is unique, not part of a surface that spans the “cut”.