SteamyTea

Prof. Brian Cox did the same calculation, but got a different result. At today's global energy usage, all the biomass on the planet would last 400 days. Plants will convert about 0.25% of solar energy to biomass, PV will easily convert 10%.

Well worth a listen to. To use biomass for in and out UK flights would take 68% of farmland (I think is what they said). https://www.bbc.co.uk/sounds/play/m002j755

Can I comment again now?

TL;DR We looked at phantom power draw a while back with regard to crankcase heaters, has this been ruled out?

Polyurethane foams will break down quite quickly when exposed to moisture, UV and thermal cycling (why they are not used in small aircraft manufacture anymore). Cut out what you can, refill with a suitable foam, then as soon as you can, cover the gap with a combination of silicone and trim.

Not a very large window though.

Yes, I think my search picked up the value for basalt wool insulation ((expletive deleted)ing AI results). Is glass wool emulsion bound like chopped strand mat (eglass) is. If so, that would account for the itching. Powder bound CSM is not so itchy.

"Falsehood flies, and truth comes limping after it" Jonathan Swift 1710

The press tends to print stories that are rare, not common. Why we read about EV fires, but not ICE ones. Nor only has child mortality dropped, so has birthrate in most countries.

You can go and see all the best data there currently is here: https://ourworldindata.org/grapher/electricity-mix-uk?tab=chart&country=~GBR But a quick précis below. You can discus population growth, but it is not the problem, bad management and denial of technology to others is where blame lies.

Rain is warmer today than yesterday.

I just had a look that the thermal properties of glass and basalt. Glass has a conductivity between 0.9 and 1.2 W.m-1.K-1. Basalt 0.03 and 0.04 W.m-1.K-1. But that is only part of the story. Density, and therefore the ratio between fibres and air (which does the real work), water absorbing, combustion temperature and flame spread, insitu slumping and cost are important. They will both make you itch.

I got paid quite well. I was approached about using some of my storm footage a few months back, no pay, told them to not bother. They seem to think that giving an 'amateur' just a credit is enough. We should really point out that we have minimum wage in the UK (why I dislike voluntary work). Though we do all contribute days and weeks of hours on here, for (expletive deleted) all, except the occasional abuse. But I pay for entertainment.

The TV work I have done is not far off that. 2 people, the camera operators, who also did the lighting (Best Boy) and the director, who also did the sound ((expletive deleted)ing helicopters taking off from Culdrose). Was all very easy and relaxed on site. The studio side was a different thing all together. About 20 people, tonnes of gear and wires everywhere. The director/producer was a tyrant, the Best Boys had to sort all the mess out. Was good fun, especially the time I had to find, control and be filmed with some rare breed farm animals for a medieval film (that got canned).

Perspex is a trade name (like Fibreglass and Hoover), but if it is a proper acrylic it should not yellow (acrylic is the only true optically clear plastic). You can get acrylics that have rubber nanoparticles (smaller diameter than visible light wavelength) in them, this improves toughness, these can discolour over time. The reason for picking cast over extruded is to do with the way that the polymers are aligned during manufacturing and processing. Cast has the polymer chains randomly 'scattered' during curing, this makes for a homogeneous mix (thermal and optical properties the same in all directions). Extruded, on the other hand, has the chains aligned in one direction (as it is a hot process that rearranges the already cured polymer). This means that there is a difference between directions, especially with thermal expansion, this can cause the sheet to ripple more in one plane than the other. Cast usually costs more than extruded, but is easier to cut. If hot processing acrylics i.e. vacuum forming, the sheets have to be baked in a drying oven for many hours to expel moisture. Polycarbonates, while immensely strong, do weaken with age as they are susceptible to chemical attack (mainly petrochemicals) and ultraviolet light degradation. Another alternative that is extremely cheap is polystyrene, I have made my secondary glazing from it. 2 years on and it is fine. There are UV stabilised mixes for outside usage but I did not bother as it was an experiment (and one that paid for itself in 2 years). (Even after 25 years out of the plastics/polymer industry, I still miss it in some ways)