Fatigue

No I'm not tired. This post is about metal fatigue.

As the book says:

Fatigue may occur when a member is subjected to repeated cyclic loadings. The fatigue phenomenon shows itself in the form of cracks developing at particular locations in the structure. 

Cracks can appear in diverse types of structures such as: planes, boats, bridges, frames ,cranes, overhead cranes, machines parts, turbines, reactors vessels, canal lock doors, offshore platforms, transmission towers, pylons, masts and chimneys. 

When Colin Dundas was preparing Albert for painting he noticed a narrow fatigue crack adjacent to the engine room hatch on the port side and called me in to inspect it. Fatigue can influenced by geometry. The hatch surround was likely to be the weakest spot for vibrations from the engine.

Albert has a classic two-cylinder engine and I suspect that fatigue was at its worse just before our engine mounts failed in summer 2016. When I looked at the engine mount damage I suspected that one of the mounts had had a long term crack and that vibration levels had been slowly increasing long before both mounts on the starboard side let go. 

The cracks by the hatch were not in part of important structure, but I was thankful for Colin recognizing what they were and then hiring in a welder to sort it out. The welder drilled the ends of the cracks to stop further propagation before neatly welding it all up.

Cracks prepared for welding

Finished

Repaint Progress

So Albert is is in the dock and all the fittings, windows and hatches have been removed. Rust spots are being treated and some rubbing down has started.

We visited High House Wharf and discussed with Colin colour shades and details such as how the windows will be refitted. Start of a long process.

Windows Out

Fitbit Boating

For Christmas our family bought us Fitbits. We are now more aware of days when we take little exercise. With my role as a scientific editor being sedentary (long periods on the computer) I have certainly been pleased with the occasional vibratory reminder on the wrist.

Now I know there are arguments about the validity of step counting (activity tracking) and its link to fitness, but I have wondered just what my Fitbit would make of boating. There are periods where you may be sitting or even standing (i.e. steering) followed by periods of activity mostly associated with locking. So last weekend, when we left Yardley Gobion for Weedon, I wore my Fitbit Alta for the first time whilst boating.

The day started by getting Albert prepared for the trip - turning on the power and gas, disconnecting the shoreline, fixing ropes etc.. This was followed by steering to the bottom lock of the Stoke Bruerne flight. One problem identified by some users is boat movement being recorded as steps. This certainly didn't occur, I presume because compared with most other boats canal boats are usually stable.

Once at the locks Maggie steered and occasionally helped with closing gates and I opened and closed the paddles, gates etc. from the bottom to the top of the flight. After the flight I took over the steering again and was at the helm all the way to High House Wharf. This was followed by a period of winding, tying up and turning off power etc. The whole day was recorded as a creditable 11,569 steps (above the magic 10,000 recommendation) but what interested me more was the pattern - when and where was I most active and by how much.

The Fitbit is linked to my iPhone so I can examine the data reasonably easily. Below is a graph of my day's steps with the yellow portion indicating periods of "active" steps.


The boat preparation period, around 11:00 in the morning, contributed some steps but locking up the Stoke Bruerne flight from 12:00 onward certainly changed the day's profile. Over an hour of moderate activity and a good number of  steps were recorded. I must admit I didn't hang around when operating the locks, but I am in my seventh decade and I don't move that quickly. Reaching High House at around 4:30 and sorting out the boat also added some steps but not any of the "activity" variety.

I think the data clearly show the benefits of locking for improving your activity profile. I don't suppose this comes as a particular surprise but is interesting to see how locking can be quite an active pastime. Of course it's not a substitute for a session in the pool, or perhaps the gym, but it's perhaps not as sedentary as some observers think.

Albert having a Repaint

Last August I noted in a post that we were considering having Albert repainted. Our last repaint was successful and it lasted well, but on the basis that much of the paintwork has faded and a few spots of rust had appeared, we felt it was time to have a repaint before serious deterioration set in. A few of our friends have commented that we hadn't had it done that long ago - I had to remind them that the last paint job was 10 years ago!

Albert looking shiny - but this is the good side and its just after the rain!

Having arranged with Colin Dundas for a slot at his facilities in March, I rang up Colin recently and discovered that he could move us forward into February because of a change in plans for another client. This was OK by us because the dock is heated and humidity is monitored. So last weekend we moved Albert north to High House Wharf.

I got the boat prepared in the rain on Saturday. I could not resist taking a photo of the sign-writing because, somewhat ironically, it looked really good in the rain. On Sunday we made our way north going up the Stoke Bruerne flight alone and with only a pair of boats coming south. The dry bright but cold weather had brought out the walkers and both the canal-side pubs at Stoke looked busy. It's great boating on days like that.

Grafton

In the top pound Stoke Bruerne Flight

Stoke Bruerne Top Lock
CRT installing mooring rings at Stoke Bruerne

We made High House around 4:30 PM. At this time of the year that's just before dusk. We winded and then moored up just outside the dock. The process wasn't made easy by a plonker mooring a boat right opposite the winding hole! There was plenty room all along the section between the bridge and the marina - a typical case of "not engaging brain". We winded with only a few inches to spare. 

On the Monday I moved Albert into the dock and discussed paint matters. A few sheets of thin ice had formed overnight on the surface of the canal. We are basically going for the same scheme but with a few minor changes/improvements. I think the first job will be removing the windows.

Bathroom Refurbishment Part Two



When you start a refurbishment its hard to know when to stop. As I reported earlier, we had our bathroom tiled and a new shower and washbasin fitted. This looked so good we decided to go further. Maggie is currently making some new curtains for the smallest room and I was persuaded to remove the wallpaper that covered the panels in the toilet area. 

When we bought Albert back in 2003 half the panels in the bathroom were covered in a tasteful Laura Ashley wallpaper called Palmetta . We know it was Palmetta because we had the same design in our dining room at home back in the late 1980s. The design matched the floating cottage antique look Albert has but we decide early on on a brighter look and went for a plain Laura Ashley paper that contained a delicate motif that matched some Laura Ashley cranberry-coloured curtains. 

So after some discussion we decided this time that, although wallpaper can clearly work on some areas of boats,  it can be tricky particularly with wet winters and bathrooms with showers. Paint it was to be.

Wallpaper off - now to get off the glue!

No problem really - just strip off the paper and then apply the paint. Well there were two layers of paper and the original was stuck on with lots of glue. So the steamer came out. In a cramped area such as a boat bathroom it was quite exciting. I got into some interesting positions. 
.
Primer on - now for the top coats


It took two steams - one for the two layers of paper and another for the glue. That was followed by a lot of sanding and then priming and finally three coats of paint! Not a big job really, but every stage required around half a day at the boat. In total I had eight visits.

Finished!

Today we finally finished and I must say I am pleased with the look. We now have a very smart "smallest room on the boat" and it should be more practical. 

But wait! Maggie still has the curtains to finish. They will be the same pattern as the old, and of course Laura Ashley. but they should look fresh and clean.

Original Palmetto paper