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Navigating and living on the waterways of Continental Europe and news of canal developments. (Public)
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TOPIC: External Sun shades

External Sun shades 21 Sep 2022 09:48 #132015

  • Colin Stone
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And following on from my last post, this Kingfisher thinks he has found a mate and has been courting his reflection this morning for some time.

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External Sun shades 13 Sep 2022 08:24 #131911

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I fogot - I put a Bronze External Mirror Window Film on the saloon double glazed windows. The temperature of the glass internal face is considerably reduced compared with before. The website claims upto 80% reduction of heat andcglare.
And it is one way so those outside can't see in. We have seen people using it as a mirror to comb hair etc, while watching from inside.
On the garden fleece - an advantage is that it is a small volume stored.
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External Sun shades 13 Sep 2022 08:09 #131910

  • Pete Clark
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We too use a no-name approx. 10m x 1.40m white rubberised canvas sheet, when moored, strung from the coach roof handrail and weighted with fishing weights to keep the lower edge hanging outside the gunwhale to provide air circulation. It certainly helps, though we would no doubt also benefit from some of the additional measures described by others to provide a further couple of degrees temperature drop.

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External Sun shades 13 Sep 2022 07:25 #131909

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We used a fabric called Texaline. A polyester? mesh. You can see out without others seeing in. Kept our trawler a few degrees cooler.
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The most critical aspect of restoring an old boat is hiding the receipts from your wife.

External Sun shades 11 Sep 2022 21:26 #131894

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[/quote]Hi Peter

Yes, with river water around 30C it makes about 3⁰ difference inside.

A couple of things

All windows that cannot be left open in a rain storm need to be closed.

A fresh water rinse is required to wash off the canal/ river water, risk of smell, grime and worse Weil's disease 😮. Rats just love water.

Paul Hayes[/quote]

Hi Paul. It's not the difference in temperature between the river water and the air that causes cooling - it's the fact that when water evaporates it sucks huge quantities of heat from the surface it lies on. Stick your finger in your mouth to wet it (at body temperature) then blow it (at body temperature) and one side will immediately cool considerably - caused by evaporation. Even more convincing, but perhaps not recommended in busy marinas, stand on your deck stark naked on a hot sunny day. You'll fry in the sun, or you'll shiver if someone put the deckwash onto you, even with just 3 degree temperature difference! Try it! ;)

Water on a hot cabin roof will quickly evaporate, particularly if there's a breeze and this will remove lots of heat from the roof material. Best to keep most windows closed apart from side ones that will encourage a through draft.

Regarding water quality, most will be fine - after all many boats use river water for their deckwash supply - but an occasional scrub may be necessary to prevent a build-up of the small amount of sediment the pump will draw from the river.

Peter

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External Sun shades 11 Sep 2022 19:49 #131890

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Peter Cawson wrote: An alternative to shading areas of deck to keep the inside cool, has anyone rigged up a small pump and soaker hose so that most of the deck is kept wet with river water? The evaporation of this water would greatly lower the deck temperature, probably far more effectively than just shade.

Peter


Hi Peter

Yes, with river water around 30C it makes about 3⁰ difference inside.

A couple of things

All windows that cannot be left open in a rain storm need to be closed.

A fresh water rinse is required to wash off the canal/ river water, risk of smell, grime and worse Weil's disease 😮. Rats just love water.

Paul Hayes

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External Sun shades 11 Sep 2022 16:09 #131883

  • Tim Cahill-O'Brien
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We have some on our boat that were made by a canvas maker - the kind of guy who also makes the canvas top. They are made of a stiff white plastic mesh. They let some light through them so its not too dark inside. They work way better than the curtains inside the boat. Ours are held on using those studs that you find at salmakers - the ones where you pull the outside and it releases its grip on the stud.

You want something that you can use underway and that wont blow away. Also the sun is usually on one side more than the other so its good if you can shade the windows on one side and be able to see out on the other.

Horizontal hatches can have canvas covers and you can also buy air scoops that will catch the wind and direct it down into the boat.

Places like Mexico, Texas and Florida are hot, with stronger sun than france and full of boats and pretty much have it figured out so look at what they have done to their boats - no need for a lot of trial and error.

Portable air conditioners are never very efficient and use a lot of power for what they do. The best units are installed air conditioners that are water cooled with raw water - you can also use these with your refrigeration which will also struggle in 40C heat.

Whatever you do make sure that you can deploy the shade at the same time as having the window open. A closed shaded boat will be hotter than an open unshaded one.

These solutions all help a little but if its really hot they wont cool your boat enough to make it comfortable - under 28 or 29C.

Finding a shady mooring is key and when its really hot you can always check into a hotel. We have small dogs and thats always an option for us. At the end of the day a boat is just a tin can in the sun and there is only so much you can do.
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External Sun shades 11 Sep 2022 15:35 #131882

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Old bed sheets over the skylights and main windows (which are conveniently recessed), secured with magnets.

We have astroturf on some deck areas so I just run the deck wash onto that and soak it. That makes a big difference, as said latent heat of evaporation etc. I have never noticed canal water depositing dirt. It’s the same water that I use to wash the decks. The deck wash is also used in the evening to take the heat out of all other areas that have seen the sun. The hull side steams magnificently!

We do have a portable AC unit: absolute waste of time! It does pump out a lot of heat but makes no real overall difference. Better to open everything up and let the air through.

Balliol.
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External Sun shades 11 Sep 2022 13:44 #131881

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Clean running river water OK but not sure about long term use of typically cloudy/murky canal water and the build up of debris. Solar powered pump and irrigation hose.

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External Sun shades 11 Sep 2022 13:41 #131880

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The brightest white is the best colour. The darker the colour and the material becomes more of a radiator. This summer the sun's heat could still penetrate a white material quite a distance, so I think an air gap is really needed behind the cover. This will also allow the hot inside of the material to cool by convection.
I would be thinking of of 50-75mm pillar posts around the window perimeter with Tenax/Lift a Dot/Snap car hood/tonneau type fasteners on the outer end to hold a white cover away from the glass.
Canvas is probably the best and most durable but difficult to sew without a reasonably heavy duty, all metal, sewing machine. I've now got a PU coated Sauleda Acrylic Canvas Cloud White ACCW15PU, from www.kayospruce.com/sauleda-acrylic-canvas-p-u.html
A few years ago I bought a 1950s Frister Rossman sewing machine that will stitch 7 layers of canvas. White sheeting/calico etc would be lighter and easier for a domestic machine.
Earlier this summer I was using the garden "fleece" as an external curtain. Reasonably effective but not that robust in a breeze, although 2 layers with alternate slits to let the breeze through would help.

I've also been thinking about the extending blinds seen on buildings and sides of camper vans. Luxury would extending blinds all round, but perhaps a couple that could be moved around to follow the sun.
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External Sun shades 11 Sep 2022 13:34 #131879

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An alternative to shading areas of deck to keep the inside cool, has anyone rigged up a small pump and soaker hose so that most of the deck is kept wet with river water? The evaporation of this water would greatly lower the deck temperature, probably far more effectively than just shade.

Peter
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External Sun shades 11 Sep 2022 13:05 #131878

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Along my side windows I use a roll of cheap, light, white cheesecloth / muslin, fixed with small magnets. I just turn over the top edge to adjust the height to hang above the side deck. No sewing involved, though a little hemming with tape at the ends might make it look a little better. It's very effective and quick & easy to deploy or store. Anything heavier like canvas seems excessive - and the lightness of cheesecloth still lets in enough daylight, without the heat.
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External Sun shades 11 Sep 2022 12:25 #131877

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My task for the winter is to make sun shades to be fixed externally to the windows of our Linssen 35. The heatwaves this year in France were a wake-up call for items we need (mobile ac being another)! We are not planning on migrating north (a propos another forum topic) 😏

I have seen on other boats and barges white shades, held in place with magnets. But is white the best colour? And material - I have canvas left over from an old cabriolet that I have used for a hatch cover already, but it is hard to work with on a domestic machine. Any recommendations?

TIA!

Judy EVANS
MV Mon Amie

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