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Quick question: are there any sites out there that have graphs showing power curve (TE vs. speed) for various models of North American diesel locomotives?Jonathan Nikiforovs. Milepost 180, CP Belleville Sub.Repainter for Yonder Locomotive Works.
"A crictic is a man who creates nothing and thereby feels qualified to judge the work of creative men. There is logic in this; he is unbiased - he hates all creative people equally." - Lazarus Long
Hi Jon, Be aware, various model go into power limiting below a certain speed. For example, a GP40-2 will only be putting out 2000 HP at its' minimum continuous speed, and only reaches 3000 HP above about 23 mph (depending on gearing). I have a lot of good curves, but unfortunately I can't display them. Please let me know if I can provide any helpful data from those which I might have. Bob
Bob: What specifically I'm looking for is a comparison between the power curves of 6,000hp engines and their "downgraded" counterparts (AC6000 vs. AC60/44 or SD90MAC-H vs SD90/43MAC)...Jonathan Nikiforovs. Milepost 180, CP Belleville Sub.Repainter for Yonder Locomotive Works.
"A crictic is a man who creates nothing and thereby feels qualified to judge the work of creative men. There is logic in this; he is unbiased - he hates all creative people equally." - Lazarus Long
Hi Jon, I don't have good curves for the AC locomotives, but this might be useful. For DC: HP=(volts x amps x efficiency)/746 For AC: HP=(volts x amps x efficiency x power factor x 1.73)/746 For best AC designs, efficiency is 92-94% and the power factor is about 97-98%. The 1.73 is an adjustment for three phase AC motors, such that the AC motor will do more work for a given input than a DC design. The power factor relates to frequency issues in the application curve verses rotation. Bob
Okay, thanks: those formulas work just fine for my purposes...Jonathan Nikiforovs. Milepost 180, CP Belleville Sub.Repainter for Yonder Locomotive Works.
"A crictic is a man who creates nothing and thereby feels qualified to judge the work of creative men. There is logic in this; he is unbiased - he hates all creative people equally." - Lazarus Long
