Skipjack Kathryn by Mahuna - FINISHED - 1:32 - Based on HAER Drawings

[Mahuna]

10 hours ago, usedtosail said:

The model looks fantastic so far. Very nice framing and planking.

Thanks Tom!

 

7 hours ago, popeye the sailor said:

every time I come in lately,  I get stuck in the kit forum........I've finally gotten the chance to see what going on in here today.   I missed a lot Frank......catching up was fun though    man,  you made a lot of progress.....the inner nad outer hull is looking great!   outer planking superbly done.......really very nice!  

Thanks Popeye - glad you got 'unstuck' enough to catch up. Still a long way to go!

[Omega1234]

Have a safe and enjoyable trip, Frank!

 

Cheers

 

Patrick

[GuntherMT]

Unless you are headed to Death Valley, I'm pretty sure anyplace you go will be cooler!

 

Have a good and safe trip Frank!

[HIPEXEC]

Where are you going, Frank? I'll be leaving again Sunday for a few weeks. You're right, Brian, anyplace is cooler than here.

[Mahuna]

Rich - on the way home (currently in Albuquerque) and will be home tomorrow PM. We were in Colorado and Nebraska visiting family. Much cooler there!

[HIPEXEC]

We are leaving Sunday for Sweden, Denmark, Estonia, Germany and Russia on another cruise. Back around the 19th. Nothing will be as good as Ireland. 

[Mahuna]

Part 27 – Guards and Waterway

 

Having returned from our road trip to Colorado and Nebraska, it’s back to work on Kathryn.

 

The first task is to install the outer stem.  As shown in an earlier post, this timber has pegs inserted that allow it to be positioned against the inner stem, seating these pegs in holes that had been pre-drilled.  The outer stem tapers from the edge of the hull planks to the cutwater, and rough shaping was done before attaching the stem.

 

Since clamps would not hold on the slanted surfaces, temporary pins were used to hold the timber in place.  The small wood blocks prevent damage to the stem when the pins are hammered in place.

 

                        

 

The shaping of the outer stem will be worked on as the rest of the hull preparation proceeds.  Final shaping will wait until the Cutwater is installed.

 

                        

 

Kathryn, as in most other Skipjacks, has guards installed on the hull.  These guards reach from approximately the forward hatch to just aft of the cabin.  The guards are tapered – on the model the guards are 1/8” thick against the hull, and taper to 3/32” on the outer edge.  The stock for the guards was tapered by hand prior to installation, and then the guards were soaked in boiling water and clamped to the hull for drying.

 

                        

 

The guards taper in the forward and aft ends.  The following photo shows the starboard guard (bottom of the photo) already tapered, and the port guard awaiting tapering.

 

                        

 

After drying for 8 hours, followed by the fore and aft tapering, the guards were glued to the hull.

 

                        

 

Holes for functional bolts (1/32” brass rod) were pre-drilled before the guards were glued in place.  Once the guards were in place, the hull was drilled to accept the bolts, and then the bolts were glued in place using medium viscosity CA.

 

                        

 

The following photos show the aft taper of the port guard and the forward taper of the starboard guard.

 

                        

 

                        

 

The next task was to make the waterway, which is the lower part of the log rail.  A template was made from 1/32” plywood in order to facilitate measuring and shaping of these components.

 

                        

 

The forward section of the waterway, from the knightheads to the area of the mast, are tapered.  The width of the waterway at the knightheads is 7”, and this increases to 10” at the mast.  The 10” width is then continued for the rest of the waterway.  The following photo shows the forward section of the waterway after initial shaping.

 

                        

 

The waterway is flat in the area of the log rail – the outside 4 inches – and is 4 inches thick in that area.  It then tapers to deck plank thickness (1-3/4”) on the interior edge.  A compass was used to mark the outside edge for the log rail.

 

                        

 

And then was used to mark the plank thickness.

 

                        

 

The water way was shaped using a rotary tool and sanding blocks.

 

The forward section of waterway needed to be pinned in place, since clamps would not work.

 

                        

 

The rest of the waterway sections could be held in place using clamps.

 

                        

 

                        

 

 

Since the model will be painted I did not use scarf joints to join the sections.

 

The aft section of the waterway and log rail do not extend all the way to the transom – they are curved just forward of the transom.

 

                        

 

There is still a lot of cleanup (scraping and sanding) prior to painting, but the log rail and some other items need to be installed before the cleanup can be completed.

 

The following photos show the current status of the model.

 

                        

 

                        

 

                        

 

                        

 

                        

 

                       

 

Next up is completion of the log rail, which will be the subject of the next post.

 

 

[russ]

Beautiful work on the waterway.

 

Russ

[Omega1234]

Hi Frank. 

 

Beautiful work. I don't know about you, but if it was me, I'd be varnishing the hull and then seeing how well she floats in the bath tub...😉

 

Cheers. 

 

Patrick

 

 

 

 

 

[EdT]

Wow!  A lot of pictures, Frank.  She is looking lovely.  You may have cornered the market on those spring clamps.

 

Ed

[Mahuna]

9 hours ago, russ said:

Beautiful work on the waterway.

 

Russ

 

Thanks Russ.  I'm looking forward to getting the log rail on - then we'll see Kathryn's full lines.

 

4 hours ago, Omega1234 said:

Hi Frank. 

 

Beautiful work. I don't know about you, but if it was me, I'd be varnishing the hull and then seeing how well she floats in the bath tub...😉

 

Cheers. 

 

Patrick

 

 

 

 

 

 

Thanks Patrick.  Sounds like a fun idea, but I don't think I'll risk that!

 

3 hours ago, EdT said:

Wow!  A lot of pictures, Frank.  She is looking lovely.  You may have cornered the market on those spring clamps.

 

Ed

 

Thanks Ed.  I sometimes have to remind myself to take photos of the process, but I've found that the 'current state' photos help me find some areas that need tuning.  In a couple of the above photos I see issues that I missed and will need to clean up.  As for the clamps, I guess you just can't have enough! 

[popeye the sailor]

great looking hull Frank..the waterways add to the layout for the deck  

[Mahuna]

4 hours ago, popeye the sailor said:

great looking hull Frank..the waterways add to the layout for the deck  

 

Thanks Popeye - it's looking more like a skipjack after every session.

[albert]

Great beautiful work Frank.

[Mahuna]

18 hours ago, albert said:

Great beautiful work Frank.

Thanks Albert!

[Mahuna]

Part 28 – Some Fixes

 

Looking at the photos in the last post I noticed that the waterway width is not consistent – this needed to be corrected, since it would cause problems when the deck planks are installed.  The circled areas in the following photo illustrates the issue.

 

                        

 

This was the most obvious area that was out of measurement, but wasn’t the only one.

 

A compass was set to the proper measurement for the waterway width, and was run around the entire waterway to determine where corrections were needed.  Fortunately there were no areas where the waterway width was too narrow.

 

                        

 

The problem areas were reduced by first using a diamond bit on the rotary tool to remove the excess stock.

 

                        

 

This tool is a tapered round grinder bit, and has a ‘safe end’ that allows the tool to run against the deck beams without taking any cuts in those beams.

 

                        

 

After removing most of the width, a variety of tools were then used.  From left to right in the following photo: a sanding stick made from a tongue depressor, with angles cut into the ends to allow close sanding work; a riffler file with a safe edge – allowed working against the edge of the waterway without damaging the waterway; and a hobby knife to clean up the final work.

 

                      

 

The waterway is now a lot cleaner and more consistent, as in the following photo.

 

                        

 

I also noticed that I had made an error when installing the knightheads.  The measurements I used were for a single timber for each knighthead.  Unfortunately the knightheads are made up of two timbers on each side.  This was an easy fix, since there was still enough room to add the second knighthead timber on each side, and only required cutting away the forward part of the waterway.  If this hadn’t been discovered before the subsequent steps, correction would have been much more difficult.

 

The following photos show Kathryn after these corrections were completed.

 

                        

 

                        

 

                        

 

Next up is the installation of the Log Rail.

[MEDDO]

Very nice recovery

[Mahuna]

6 hours ago, MEDDO said:

Very nice recovery

Thanks Michael.

[druxey]

Well, those were good saves, Frank! Did you sweat a bit when revising the waterway?

[Mahuna]

1 hour ago, druxey said:

Well, those were good saves, Frank! Did you sweat a bit when revising the waterway?

 

Thanks, Druxey.  No, I didn't sweat very much about fixing the waterway - it actually was pretty simple.  Maybe I'm just getting used to fixing my mistakes - I'm getting a lot of practice at it!

[popeye the sailor]

it's actually not a bad practice to leave a little extra on the part......something to work with in fitting the part.   in some cases,  it can save you from creating a gap here and there.  I think the extra knight head posed the bigger problem     good you were able to make the adjustments without any issues  

[Mahuna]

Hi Popeye.  I agree on leaving a little extra - even though in this case it was not intended it did work out well.  The knightheads weren't too difficult, since there was lots of room where they should have been.

[Mahuna]

Part 29 – Log Rail

 

Kathryn’s sides above the waterway consist of a log rail topped by head rails.  The log rail is a 5” x 5” timber, the headrails are 4” x 3” supported by iron stanchions.  This entire configuration is painted white.

 

The forward log rails are doubled from a few feet forward of the dredge rollers to the knightheads, topped by a single head rail.  The rails aft of the dredge rollers consist of the log rail topped by two head rails.  The stanchions between these two aft head rails alternate in thickness, while the stanchions in the forward rails are a consistent thickness.  This configuration can be seen in the following photos.

 

                        

 

                        

 

The different timbers of the rails would need to be shaped to match each other  and drilled for stanchions so that the holes would align.  Using the plywood template developed in an earlier post, rough drawings of each of the components of a rail were cut on the scroll saw and were then glued together using small spots of school glue, as in the following photos.

 

                        

 

                        

 

The line for the interior edge of the rail was an accurate depiction of that edge, and was used as the reference edge for the rest of the shaping.  This edge was sanded to the reference line on the spindle sander.

 

                        

 

A compass was then used to mark the thickness of the log rail on the outer edge of this assembly.

 

                        

 

The assembly was then sanded to that outer edge line. 

 

                        

 

While all components were still glued together they were drilled to accept the stanchions.  A table with a vertical peg (used in one of the early posts when shaping the keelson) was set so that the holes would be drilled a consistent distance from the inner edge.

 

                        

 

                        

 

After drilling was completed, the cap rail was separated from the assembly be gently tapping a razor blade through the glue joints.

 

                        

 

                        

 

Since the width of the cap rail is less than the width of the log rail, the width of the cap rail was marked using a compass, and the rail was then reduced to its final width using the disk sander.

 

                        

 

The two pieces of the log rail were separated, and the upper rail was reduced in length.

 

                        

 

The fit of the three pieces was tested, using filler blocks for the spacing.

 

                        

 

The starboard side rails were then prepared.

 

                        

 

The log rail needs to sit level on the waterway so that the stanchions would be vertical.  To test this, the log rail was clamped to the hull and a brass rod was inserted in one of the holes.

 

                        

 

The rod did not sit level, so the waterway was shaped using a rotary tool until it allowed the stanchions to sit vertically.

 

The lower log rail was pinned and glued to the hull, and then the second log rail was pinned and glued, using some brass rods to assure proper alignment.

 

                        

 

After gluing the log rails the forward cap rails were temporarily installed.

 

                        

 

                        

 

Since this seemed to achieve a good result, work continued on the remainder of the log rails.  The next section ran from the end of the first section to the round section in the stern, and consisted of the log rail and two cap rails.  The complex arrangement of the stanchion holes can be seen in the following photo.

 

                        

 

The log rail was pinned and glued.

 

                        

 

The log rail and the two cap rails for the rounded stern were prepared in the same way.

 

                        

 

The log rail is now fully installed.  The cap rails will be left for a much later time.  I’m afraid that installing them too soon would make some of the remaining work (deck planking, etc) more difficult and would present a risk to the cap rails.

 

The following photos show Kathryn’s current state.

 

                        

 

                        

 

                        

 

                        

 

                        

 

                        

 

                        

 

                        

 

Sorry for the very long post, but it was a fairly complex subject for me.  Thinking about how to install the log rails has been my sole focus for the past few days, so I’m not sure what task will be next.  There are several items that are independent of each other, and I don’t think the sequence matters too much, so we’ll see what develops!

 

Thanks everyone for following this build – it has been a real education for me, and a very enjoyable experience so far.

[russ]

Very interesting construction and method. I had not seen this sort of arrangement before. Good work and execution.

 

Russ

[popeye the sailor]

very nice method.........this could also be applied to stanchion railings too.    one to file away    well done!

[usedtosail]

Yes, thank you for that great tutorial on building mutli-piece rails. Very well done.

[Mahuna]

11 hours ago, popeye the sailor said:

very nice method.........this could also be applied to stanchion railings too.    one to file away    well done!

 

Hi Popeye - thanks!  I'm sure there are lots of other approaches, but I felt most comfortable with this one.

 

10 hours ago, usedtosail said:

Yes, thank you for that great tutorial on building mutli-piece rails. Very well done.

 

Thanks Tom.  Installing the rails is still a long way off, but I'm looking forward to seeing how they come out.

[thibaultron]

I once read an article in a modeling magazine, about a highly detailed scratch built WWII Germany armor/gun. The author said that in building the vehicle, he had probably thrown away an entire other model in incorrectly made parts. So you are doing great to only have to make the corrections you have.

[Omega1234]

Hi Frank

 

I just love your work.  Precision, Care and Attention to detail... nice!

 

Cheers

 

Patrick

[Mahuna]

12 hours ago, thibaultron said:

I once read an article in a modeling magazine, about a highly detailed scratch built WWII Germany armor/gun. The author said that in building the vehicle, he had probably thrown away an entire other model in incorrectly made parts. So you are doing great to only have to make the corrections you have.

 

Hi Ron - yeah, my scrap box still has some room in it, but there are still lots of opportunities for do-overs.

 

3 hours ago, Omega1234 said:

Hi Frank

 

I just love your work.  Precision, Care and Attention to detail... nice!

 

Cheers

 

Patrick

 

Thanks Patrick - I'm enjoying this build.  Kathryn is one of the nicer skipjacks and I'm trying to do right by her.