Bob Pease writes the Pease Porridge column in Electronic Design magazine, one of those freebies they send to dork engineers. It's actually pretty good, and Pease is a colorful curmudgeon who writes about whatever the hell he wants. Since we have a truck driver in our midst who's taken double clutching on as his tagline, here's Pease's What's all this double-clutching stuff, anyhow? article. I've read him for years. This guy drives a volkswagen bug around silicon valley to get to work at national semiconductor, but he usually knows what he's talking about even if it's not electronics. Correct me if I'm wrong, Mikey D.
Here's the crux of the matter:
First, you take your foot off the gas and kick in the clutch. You shift into neutral, AND let the clutch out. You wait perhaps 0.3 to 1.0 seconds for the engine to slow down from its high revs, depending on how fast you were revving when you started to shift and how much inertia the engine has to slow down. THEN you kick in the clutch and shift into third, and let the clutch out quickly, feeding the gas appropriately. If you have judged it right, when you let the clutch out, there isn't any JERK. And when you shove the lever into third, the gears and engine are at a synchronized speed, so there's minimum wear on the synchronizers, which are the tiny clutches that bring the clutch plate and the gears into smooth synchrony. There's also usually less wear on the clutch plates.
But there's much more, including naturalists playing tricks on condors.