Skipjack 19 foot open launch By Michael Mott 1/8th scale Small

[Jim Lad]

I bet your workshop's as glad to see you back at work as we are! 

 

John

[TBlack]

Michael,

Windows in the new workshop! Most impressive. I'm jealous.

Tom

[Thistle17]

Hello Michael. Your disciplined and extremely well executed staging is always an inspiration to me. I think I understand your process well enough as I learned watching David's build of his recent model using similar techniques. The hull blank is in itself well thought out but after trying unsucessfully to blow up your photos, for closer inspection,  it leaves me with a couple of questions. Can you relate the following? 1. Is the hull blank a bread and butter fabrication with the extensions for the "ribs" fastened afterwards? 2. Some "ribs" fall within the relief slots and some don't; can you relate what is going on there? 3. And lastly what method did you use to create those reliefs?

 

Thanks

 

Joe

[michael mott]

 

 

Good morning Joe, I used the lines plan to create the form and because this was a form that was going to be shaped with a file and sanding the station lines are regularly spaced on the build board. the following entry that I posted earlier in post 841, hopefully illustrates an answer to your question. 

there are 16 frames and there were 21 station lines,. when some of the boat builders use 5 or 6 forms or molds to set the curves then set stringers to create the form before steaming and setting the ribs or frames. This is a relatively small boat at only 19 feet overall.

As soon as I began to shape the frames the wanted to fall along the easy line and not the twisted one formed by the station lines, Design and form and function are three related principles that interact with each other in complex ways, the plan view of the rib below because of its shape wider than thick naturally did not want to twist. so giving in to function and form I let the frame follow its natural fall line so to speak. there is some slight twisting but it is minimal.

I am assuming that the builders in 1909 used the mold and stringer method to form the lines then added the steam bent ribs after before planking. The owner told me that the frames  on Skipjack are approx on 12 inch centers the spacing is closer to the real boat than the station lines that I drew in the beginning. there was obviously no need to add a frame at station 1.

 

I hope this answers your question, and thanks for asking it.

 

 

 

I think that one of my problems has been with the placement of station lines and the conjectured placement of the frames at the bow. and thinking that these are one and the same.

 

 

I have been trying to reconcile a frame at position 1 and am beginning to think that I have this all wrong it makes more sense that the first frame would be at the place I have marked as 2 in this plan view

 

 

Thanks for the welcome back to the shipyard.

 

Michael

 

[michael mott]

22 hours ago, TBlack said:

Windows in the new workshop! Most impressive. I'm jealous.

Tom and they are on the north side so even light as well.

This evening my neck is stiff from hunching over the keel chiseling out little pockets most of the day.

 

 

 

The microwave will get a work out tomorrow, I think I will take the model into the kitchen to avoid a lot of back and forth to and from the workshop.

Plus the sink is there for the damp paper towels, I am looking forward to getting this part done.

 

Michael

 

[druxey]

Looks a little like a centipede at the moment!

[BANYAN]

Great foundation for the frames; the sore neck will be well worth it Michael.

 

cheers

 

Pat

Edited March 30, 2022 by BANYAN

[michael mott]

Thank you Pat, and for all those who added a like I really appreciate it. Well the little critter look a bit like Spiny Norman, with apologies to the Dinsdale Brothers and Monty Python.

It took most of the day to get things sorted ( but you do what you have to do) and no the round supports are not cams I only thought about that as I started screwing them to the board.

 

I did manage to snap one early this morning, and I attribute it to by placement technique.

 

 

 

It feel very good to get to this point. I will let it dry thoroughly before marking off the sheer line and also the rest of the shaping of the stem and stern.

Then the real fun begins gluing it all together.

 

Michael

Edited March 31, 2022 by michael mott
Added text.

[Bedford]

Great to see you back at it Michael, I always love having one of yours to follow!

[usedtosail]

Spiny Norman indeed! Great work there Michael.

[Jim Lad]

Reminds me more of women getting strange things done to their hair at the hairdressers 

 

John

[michael mott]

Well the garboard strake is a rather testy little plank isn't it.

 

 

The old hot air gun works quite well with the yellow cedar. A little bit more tweaking and then this one is a wrap as they say. the plank is just resting there the pins are just to stop it sliding off.

 

 

I used the strip method to mark the positions of the ten planks. and a long trip to position the bottom of the sheer strake, which is 3iches wide at the bow and stern and 5 inches midships.

 

Michael

 

[Bedford]

Looking really good Michael.

 

I've been using some yellow cedar lately, as the inlay strips on the deck of a ski boat that was started in 1964 and never finished. I've got two bends to do in pieces 6mm x 12mm and the radius is about 30mm or less. That's been interesting. I'll try with more heat gun and see how it goes.

[michael mott]

1 hour ago, Bedford said:

I've got two bends to do in pieces 6mm x 12mm and the radius is about 30mm or less.

Hi Steve can you use a couple of layers the material is quite forgiving really.

 

Michael

[FriedClams]

It’s great reading your posts again Michael - welcome back.  Nice progress on the frames.  A few years ago during a particularly heavy snowfall winter, we had a porcupine take up residence under our kitchen deck.  My wife and I named him/her - you guessed it - Spiny Norman.  What a cultural impact the Pythons have had on our generation.

 

Looking forward to your future posts.

Gary

 

[Bedford]

22 hours ago, michael mott said:

Hi Steve can you use a couple of layers the material is quite forgiving really.

 

Michael

I probably can but for aesthetics I'd rather a single piece. It's the inner trim on a red cedar dash board, it surrounds the instrument panel. 

[michael mott]

A rather frustrating day, I did get the starboard an port garboards bent to fit and also realized that I needed to shape the stem and stern before going any further when I removed the keel a few, about half of the ribs sprung up like it was spring in the garden. and then I snapped off the stern post while shaping it. I finished shaping it and glued it back on. then using the hot air gun to deal with the ribs had trouble whith them so decided to revisit it in the morning and a new day.

 

Michael

[Keith Black]

 Michael, hopefully tomorrow turns to gold. 

[michael mott]

A better day was had on Sunday, the most tiresome aspect was keeping the young cats out of the workshop as I travelled back and forth from the kitchen Microwave and the workshop. I had to carry a squirt bottle with me on every trip to stop them dashing through the door every time I opened it.

 

Before all the trouble with the stern post I had worked on both of the garboards and they are quite close just a bit more tweaking before setting them with glue.

 

 

As I mentioned I used the strip method to marl the frames with the position of the planks, the one thing I did notice with this method was that with the frames that were canted forward or aft at the bow and stern the tick marks were angled quite noticeably. so I used the center as the datum point. This is the chart I set up to calibrate the spacing I did not mark every frame but every second frame.

 

 

I used some stiff card paper to lay out the garboards then transfered that to the 3/4" (scale) thick yellow cedar that I cut earlier from the 2" rough lumber flipped it for the opposite side and cut them out with the bandsaw, and used the miniature lee valley wood plane to finish the edges.

 

I just used the big hot air gun and twisting with gloved fingers to shape the garboards.

 

 

 

After the stern post incident I took the opportunity to revisit the frames and basically re-bent most of them, I had forgotten the bit about also using my soldering hot air gut to help set the curves as they were drying. When I bent the first frames before my surgery I had also used the hot air gun and it did make a big difference then. While working on the shaping of the stem and stern I cleaned everything off the form and reworked the dowel buttons into cams and cut full length boards of redwood, (these were cut earlier salvaged from the garage door, the same wood as in the Buzzards bay hull) to act as the lower holds for the frames.

I decide this morning that I need to also fill the gaps between the station forms at the bottom because the frames most of them fall between the stations and I want to be able to hold them securely as it will be much easier to control the position between the keel and the build board without the use of pins all over the place.

 

as you can see they are basically stable now.

 

A shot of the re glued stern post.

 

 

And the stem

 

I see I'm going to have another busy day.

 

Michael

 

 

 

[druxey]

Good stuff, Michael! What is the thickness of plank stock that you are using?

[michael mott]

Hi Druxey the yellow cedar is 3/4 inch scale so 3/32" in "real money" According to Roger the chap who did some repair work on Skipjack told him that because the yellow cedar was not as strong as mahogany that the builders used 3/4 planking instead of the usual 3/8ths.

I purchased a couple of lengths of 2x6 Yellow cedar from the local wood supplier. I planed one edge then band-sawed of the plank about an 1/8th  then planed the edge again and cut another plank and so on. after the plank was cut to shape I planed it down to the 3/32 with my Veritas low andgle bloch plane. before bending it.

 

Michael

 

 

[michael mott]

Thanks for the likes.

I glued the garboards today , not perfect by any stretch of the imagination but will have to do.

 

 

 

Tomorrow  I begin the layout of the next couple of planks.

 

Michael

[Mark Pearse]

Hi Michael

 

This will be interesting to see unfold, such an interesting hull shape.

[Jim Lad]

Coming along nicely, Michael.

 

John

[WalrusGuy]

Looks flawless, Michael.

[michael mott]

19 hours ago, Mark Pearse said:

This will be interesting to see unfold, such an interesting hull shape.

Hi Mark, yes the pictures of the original hull do give some rather deceptive assurances, but the shape is a challenge especially with the first few planks. There is a lot of twisting at the stern. I am also going to have to hollow out a few of the planks which will be new for me. When I planked the cutter I did not follow traditional planking but strip planked it so it was easy. This hull is more challenging because I am trying to build the hull with the best guess about the hull shape from the information supplied by the owner in terms of measurements, and photographs, without actually checking some of these shapes and forms myself. There are no drawings to go on other than my own culled from the information given by the owner.

 

Michael

 

 

[michael mott]

Thanks for kind comments and likes.

The second plank was more difficult than the first, I ended up making it too short so cut it into three pieces and replaced the bow section. One plank was enough for me today.

 

When looking at folk who place the planks on the full size craft there is a few guys and lots of clamps. we are spoiled with our super sized hands and strength relatively speaking as we plank up our models. That's my rational for the extra clamp and the holding pins! 

 

 

 

 

here are a couple of shots of the full size stern and stem credit to Roger Dymont who gave me permission to use the photographs.

 

 

 

I think I will need to do more shaping of the stem and stern once the planking is complete.

 

Michael

 

 

 

 

[druxey]

Looking good, Michael.

[Jim Lad]

Quote

One plank was enough for me today.

Where's your sense of adventure, Michael! 

 

John

[Mark Pearse]

Some interesting planks to come.