Re: 82's Leading Patricks West. - Where are they now?

[John MacCallum <johnmac@MYlisp.com.au>]

Maurie Daly wrote:
> 
> In article <37afba6c.2105672@news.bigpond.com> gonoNOCRAP@bigpond.com writes:
> >From: gonoNOCRAP@bigpond.com
> >Subject: Re: 82's Leading Patricks West. - Where are they now?
> >Date: Tue, 10 Aug 1999 05:38:13 GMT
> 
> >On Tue, 10 Aug 1999 03:24:48 GMT, mauried@commslab.gov.au (Maurie
> >Daly) wrote:
> 
> >>This is a difficult question but does anyone have any idea of what a full load
> >>for an 82 thru the Adelaide Hills is ?
> >>It will / should be more than an 81 / BL or  an NR due to the more powerful
> >>traction motors.
> >>
> >>Thanks
> >>MD
> >My guess Maurie would be the same as a DL they both have 710 12
> >cylinder engines.
> >regards Paul Johnston (MNRC)
> 
> Thanks Paul .
> Its not an easy comparison due mainly to the much differant weights and the
> totally differant traction motors,(DLs are quite lightweight 118T against the
> 132T of the 82s .
> The biggest differance is the continous tractive effort of 413 kn for the 82s.
> (Gruntiest 3000HP loco in the country.)
> Unfortunately railpage dosent give a starting tractive effort for 82s.
> Maybe ASR will do some load trials to find out.
> 
> cheers
> MD
Starting Tractive effort has little to do with what the Loco can
haul. All diesel electric locos have a much higher starting 
tractive effort than what they can supply continuously.
The continuos tractive effort is the tractive effort produced at
a speed that the traction motors can provide without going into
their reduced time/load range due to heating from high traction 
motor currents. 82's have a min continuos speed rating of 15.4 kph.
81 class engines have a continuos tractive effort of 33700 DaN
at 19.2 Kph.
Both 81 and 82 class engines have a nominal load of 1050 tonnes
on a 1 in 40 ( 2.5% ) grade. Due to the higher adhesive ability 
of an 82 class and its bigger traction motors it can go slower
than an 81 and therefore provide more tractive effort. Hence the
41300 DaN figure for an 82 class.
As I stated previously though in NSW Freightcorp operates 82s with
the same loads as 81s. On the long 1 in 40 grades between Molong
and Orange and Stuart Town to Orange the max load is 1130 tonnes.
This figure is less than what it appears to be practise in the 
Adelaide hills. That's probably why so many engines have problems
with slipping to a stand in SA. 


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