Category: Technology & ideas

scientific developments, inventions, design, sci fi

Water-go-round

Apart from the [good] insanity of it – elfansafetee, we laugh in your face – the mechanics are interesting:

Commenter: Rather than having 2 hoses feed onto the lines looks like there is one common pump at the base feeding water through the centre column. this feeds the water along the arms to the hose ends – more than one way to skin a cat though so could be anything.

Hmmmmm – what do you think? Sorry about the ‘music’ by the way.

[H/T Chuckles]… More here ...

Leeboards

This post replaces In praise of leeboards, a post which was decimated in the blog migration.

In sailing often the compromise or less than efficient is precisely what you need. For example, Chinese junks have poor sailcloth which curls but that curling acts like a gurney flap and adds efficiency which the flat sail does not give.

This is one reason why cloth sails will never go out, nor wooden boats, nor any workable arrangement not requiring high speed. The constant which keeps coming through is that as long as the boat operates within its designed limits, everything is more or less fine.… More here ...

The selfie

I would like wimmin [among other creatures] to stop doing 12 things:

shutterbug

1. Acting like men and talking like crows
2. Dressing as slappers
3. With mobile phones forever at hand
4. Kissing animals
5. Sleeping around
6. Going insane… More here ...

Fossil fuel v Tesla

One calculation:

So how much energy does it take to move a Tesla, say, 1000 miles, as opposed to a similarly-sized luxury car? Calculating the latter is fairly easy: using a roughly equivalent car (in size and status) as a baseline, a BMW 740i/Li, it gets (according to the DOE) 24 mpg combined, or 21/29 city/highway. 1000 miles /24MPG = 41.7 gallons.

Now for the Tesla. A Tesla Model S uses about 38 KwH of power to go 100 miles, so to go 1000 miles, easy math, the car needs 380 KwH of electricity. The figures vary very little between city, highway and combined, because electric motors use no power when idling and are more linear in application. The main difference is air drag at speed.

Well, it’s not exactly “no power when idle.” There’s a parasitic power loss. A Tesla uses power just sitting there, running its internal computers and whatnot.More here ...