Re: 82's Leading Patricks West- Question on 82 cl gear ratios & what

[mauried@commslab.gov.au (Maurie Daly)]

In article <37BB570F.66AD949A@MYlisp.com.au> John MacCallum <johnmac@MYlisp.com.au> writes:
>From: John MacCallum <johnmac@MYlisp.com.au>
>Subject: Re: 82's Leading Patricks West- Question on 82 cl gear ratios & what
>Date: Thu, 19 Aug 1999 01:00:54 GMT

>Maurie Daly wrote:
>> 
>> >I think that the NRC should have tried the Westrail 'Q' class- 4000hp,
>> >radial bogies, D87BTR traction motors, a much better package.
>> 
>> The Qs didnt exist at the time the NRs were ordered and fuel costs were of
>> paramount importance to NRC as they had then to pay the fuel excise.
>> Four stroke locos still win hands down in fuel efficiency over 2 strokes and
>> would have been a big deciding factor .
>> As a rough example the EMD 16-710G3 series engine as used in the Qs and the
>> SRA 90s pulls approx 1200 litres / hour in 8th notch compared with the
>> GE7FDL-16 engine in the NR which uses only 860 litres / hour in 8th notch.
>> Things are better now with the removal of the fuel excise.
>> 
>> MD

>That's Interesting Maurie. Do you have any other consumption
>figures for other EMD engines?

>When we work an Heavy train up the Mountains from Enfield to
>Lithgow , 81's with their 16-645 engines use about 1200 to 1500 litres.
>That's for 150 klm about which approx. 90 ins in notch 8.
>the rest of the time in some lower notches. Bare in mind that
>the train needs to ascend from about 50 metres to 1050 metres 
>and then descend to 900 metres in about 3 1/2 hours of running.
>-- 

>Pope

>Alias   John MacCallum

>remove MY from MYlisp to get the real email address.


I have some figures for the 81s .

Notch	Gal/hr US		Engine O/P	Traction HP
     0   	17  		193   		 0                                                  
     1  	 38		 442 		 248                                               
     2  	 64  		766		  573                                                 
     3  	 94		 1180		  987                                                  
     4 	122 		1594		 1401                                                  
     5  	147		 2008 		1815                                                  
     6  	168 		2422 		2229                                                     
    7  	187		 2836 		2643                                                     
    8 	 226 		3250 		3057 

This roughly equates to 855 litres per hour in notch 8.
The 82 figures are the same as the 81s.

Also for interest here is the tractive effort at various speeds plus the 
traction motor efficiency.
Speed
MPH	TE In lbs		Traction Motor
			Efficiency %

      0.0	120250 		39.0 
      0.6	120130 		41.0 
      1.2	120010 		43.0 
      3.1	119649 		49.0 
      6.2	108847 		59.0 
      9.9	 79560 		69.0 	Min Cont Speed.
     14.9 	58421 		76.0     
     
    19.9 	46122 		80.0                           
    24.9 	37912 		82.2                              
    29.8 	32208 		83.8                                 
    34.8 	27778 		84.3                                    
    40.4 	23983 		84.5                                      
    45.4 	21395 		84.7                                         
    50.3 	19291 		84.7
     55.3 	17557 		84.7
     60.3 	16109 		84.7
     65.2 	14776 		84.1 
     70.2 	13600 		83.3 
     73.9 	12821 		82.7   


At stall speed ,ie 0 mph the traction motor efficiency is really zero.
Also dont know whether below 15.8 km/h (9.9 MPH) the non continuous
rating is for 30 mins or 1 hour,seems to differ between manufacturers and 
models.

Hope this helps
MD