tag:blogger.com,1999:blog-1592992209402300549.post1374537073126864..comments2024-03-28T08:06:43.198-04:00Comments on The Silicon Graybeard: Techy Tuesday - Electric/Gasoline Hybrids Achieve FlightSiGraybeardhttp://www.blogger.com/profile/00280583031339062059noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-1592992209402300549.post-50558904080234094312013-12-20T02:02:50.445-05:002013-12-20T02:02:50.445-05:00Very interesting post!Very interesting post!Automotive Engineshttp://www.greavescotton.com/Business/automotive.aspxnoreply@blogger.comtag:blogger.com,1999:blog-1592992209402300549.post-58421040641687853072013-12-11T12:49:22.870-05:002013-12-11T12:49:22.870-05:00The problem is it makes perfect sense in a ship or...The problem is it makes perfect sense in a ship or locomotive. It is an elegant solution to many of the problems for those types of complex and large (not to mention expensive) devices. But in cars it is nt so good. The batteries are too expensive and in fact dangerous to the public and dangerous to the environment. But what may be worse for most of us is they are too expensive. If we were able to today with one brush stroke eliminate most or all of the government regulations on automotive companies and eliminate the unions cars, nice cars, would cost about $4000. But even with the highly inflated and unjustified cost for an ICE car they are still half what you must pay for a hybrid or all electric car. Why pay $50,000 for an electric car that will only get you 80 miles from home before it quits?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1592992209402300549.post-6425161054505861302013-12-11T08:15:34.493-05:002013-12-11T08:15:34.493-05:00Boy, is this overdue.
I might have mentioned thi...Boy, is this overdue. <br /><br />I might have mentioned this here before, but a great many moons ago I was involved in a development project for internal combustion reciprocating engines; we were using an engine not originally designed for racing as a racing engine, and, since the races were 60 minutes long, the goal was "how much horsepower can we get out of this thing for 63 minutes?" (quite a lot, as it turned out, except for the 63 minute issue - one weekend 4 crankshafts were quite literally ripped in half, exhausting the supply of both race and practice engines. 17K RPM to zero in under a second is not kind to crankcases, connecting rods, flywheels or pistons).<br /><br />The dynamometer data showed something interesting, though - as HP went up, fuel consumption per HP went down. The engine got more efficient within a continually-narrowing max-HP RPM range. That drove a lot of transmission development work (if you road raced motorcycles in the '70s the question was always "why does the Yamaha TZ350 have a 6-speed transmission" with the punch line "because the American Motorcycle Association won't allow a 20-speed..." Damn thing didn't need a throttle, an on-off switch would have worked). <br /><br />Anyway, years later, I got to thinking: a small, single-RPM, highly efficient turbo diesel driving a generator, assisted by a small battery pack, might be the ultimate hybrid. I think it was during the 1979 gas crisis Brock Yates and Smokey Yunick drove a Mercury Cougar equipped with a Yunick-created turbo diesel engine from Daytona to DC on something ridiculous like 10 or 12 gallons of diesel. Volkswagen is getting really impressive mileage out of its European turbo diesel Passats (EPA won't allow them here, but the American versions stretch a gallon, too http://www.autoweek.com/article/20130708/carnews/130709866), and that's with an engine that needs a wide RPM range for driveability. All that transmission work needed to manage a very narrow RPM race engine? It goes away with an electric motor for final drive.<br /><br />Copper wire is easier to run than drive shafts, and much lighter than differentials. Electric motors are getting smaller, and lighter, and automotive engineers are pretty darn smart now about computer-driven controls. An on-board power source doesn't eliminate the batteries needed for surge demands, but it reduces their number and allows them to be smaller. <br /><br />Aircraft run at a steady speed (and don't encounter hills), which is why the 70Kw output can easily recharge the batteries with a steady 65Kw system demand. Road vehicles operate in a different environment, but I think it's practical. <br /><br />I wonder if anyone is looking at this for Over-The-Road trucks? The diesel infrastructure already exists for them, and despite the hills, interstates are a good steady speed environment. Aliennoreply@blogger.com