Posted by NCWayne on August 26, 2010 at 23:54:54 from (173.188.168.49):
I read an article tonight giving MFG specs for an articulated haul truck that got me to thinking about the discussion on here awhile back. It began with me talking about my 55 and how fast I had had it running and wound up getting into a big discussion centered around HP, gearing, etc. The idea was put out that you could run a car at highway speeds with a small engine given the right gearing but the "majority" replied that it was impossible for various reasons.
For those that replied that it was impossible to get a "full sized" vehicle to a "highway speed" with a small engine, even with the proper gearing, I have these specs for you. The vehicle in question here is a Doosan Moxy MT41, or what is typically called an Artic or articulated haul truck, something that you see on construction sites all of the time. This truck has an 82,010 payload capacity and is driven with a 444HP Scania diesel engine and an automatic transmission with 6 fwd and 3 reverse gears. While it"s top speed is nowhere close to 55 it is well within what could be considered a typical vehicle"s speed with a top end of 32.9 MPH in high gear. Now, here is the interesting part. The article goes on to state that this particular truck has what is considered a "high" HP to ton ratio of 6.38 HP per ton of load.
Given this rating, any way you look at it, no matter what the ultimate HP of the engine, the HP per ton needed to move that 2000 lbs will never be greater than 6.38. Sooo, given those specs it just goes to show what was origionally said is true, given the proper gearing a small engine can indeed take a typical vehicle to a "highway" speed with the proper gearing. In other words given the right gearing you could easily get a 2000 lb car to 32.9 MPH using just 6.38 HP and the proper gearing. If this were not so then how do you explain this vehicle being able to take a 82,010 lb payload over 30 MPH using just 6.38 HP per ton....Remember, these are mfg specs on a production machine, not just something hypothetical like the numbers being thrown out before stating it was impossible.........
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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