Monday, July 25, 2011
Mars doesn't get real close to the Earth every summer. Not even once a year. The next close approach is in March of 2012. Mars closest approaches that happen in Augst or September are the closest that they get. The March event won't be particularly good. But it will be worth a look.
At the moment (late July 2011), Mars is a morning object, and the visual diameter is 4.4 arc seconds. One must magnify Mars by about 400x to bring it to the visual size of the Full Moon. Fairly large back yard telescopes can achieve this. Perhaps an eight inch (200 mm) or ten inch (250 mm) diameter telescope would perform OK at this magnification. However, the atmosphere needs to be really steady to get a good view. One can expect a brief really still view about once every five minutes.
And then, you'd get a view with the kind of detail you can see on the Moon. That is, you'd see the largest areas of light and dark. No craters or mountains. For Mars, this may include a polar cap, and shades of orange. Waiting until March will give you views that are about 4 times larger in any given telescope.
The closest views of Mars at the moment can be downloaded over the Internet. They come from a rover that is on Mars - Opportunity. The twin cameras give a very human like stereo view, in color (multiple images are taken with red, green and blue filters, which combine to make color images). Further, there's a microscope, which can take images that can show detail to something like a 20th of a millimeter.
There is something about using your eyeball and a telescope and seeing it for yourself. It's different. There's still a month or so of Saturn's big show this summer. So get out to your local astronomy club's next event and take a look.
Tuesday, July 19, 2011
My 2000 Saturn (an American car) has a lifetime average of over 43 MPG, though it's still low mileage, at 290,000. A turbocharger should boost it's fuel economy by 20%. That would bring it to 52.4 MPG. A cruise control would boost highway economy by 5 MPG. That's been my experience with all my other cars. This car isn't a hybrid, or diesel, or indeed anything special. It's a cheap, reasonably peppy 4 door sedan, with air conditioning added for summer comfort and safety. Adding a cruise control would add less than $50. A turbocharger is a bit more, but not thousands. It'd be cheaper than A/C, and would pay for itself in gas. So, 56.2 MPG was achievable more than ten years ago at a reasonable price. Why wait?
I've said earlier that reducing highway speed from 70 MPH (in Michigan) to 62 MPH (100 km/hr) improves fuel economy by 17%. This hasn't changed. Not only do you save money, but your vehicle gets better range. Highway signs are cheap. They were changed to 55 MPH nationwide for a few years in the late 70's. We didn't get out of that fuel crisis because we obtained more fuel. We got out of it by improving fuel economy. One of the issues is that refinery capacity isn't growing. So gas availability is effectively capped. That's what the crisis was about.
The following was my response to the Motortrend article, including some of the comments at the time.
The BP oil spill in the Gulf has cost plenty to everyone. It's still costing us.
The American auto industry isn't at a disadvantage. My 11 year old American car has delivered over 43 MPG, lifetime average. Nearly 50 on the highway. It's just a cheap car, with A/C.
There's a saying that "There's no replacement for displacement" in the industry, meaning you have to have a big engine to have high power. But turbochargers have been in use since at least the 1940's, where they delivered higher power at lower weight, with less fuel, giving performance and range to aircraft. That's a 70 year lifetime for this particular nonsense.
This article claims that a breakthrough in battery technology is unexpected. But more than ten years ago, flywheel batteries were shown to have a 50:1 advantage in energy storage to weight ratio over lead-acid batteries. That's much better than Lithium. Everything in a flywheel is recyclable, and there are no toxic or rare chemicals.
Friday, July 01, 2011
When i'm asked what i do for a living, it is often the case that i'm talking to someone who doesn't do what i do. I assume they don't know the details of computers at first. So i don't launch into the details unless asked. I say, "I do something with computers". It's pretty generic. I've been asked what my job title is, and i tell them. But when they ask me what that means, and it's as generic as Systems Specialist, the only really good answer is "My job is so secret, not even i know what i'm doing".