Re: Melbourne 82 class

["alan holding" <charters@river.net.au>]

Aus loco discussion mailing list

G'day all,

I'm not an engineer, however, it seems to me that an 81 class has a higher
`dead weight' than either an 82 or a G class owing to its considerably
smaller fuel capacity.
In other words, for all three to weigh approx.. 132 tonnes `in steam', the
82 and G classes must carry approx..10,000 to 10,250 litres of diesel fuel.
The 81 class is only carrying 6000 litres!
On any gradient where an 81 and 82 (or G class) were doubleheading a train
and both carrying half a tank of fuel, the 81 class would have a higher
tractive weight than either the 82 or G class.
No doubt the subscribing engineers on this list can raise many more
technical reasons for performance differences in the loco types.

See Ya    AH
-----Original Message-----
From: Stephen Molloy <c501@diesel.net.au>
To: Aus loco discussion mailing list <Ausloco@listbot.com>
Date: Wednesday, March 15, 2000 6:07 PM
Subject: Re: Melbourne 82 class


>Aus loco discussion mailing list
>
>"an 81 class is rated at 3300hp where as an 82 is only rated at 3000hp"
>
>Is this correct ??  An 81 class has 2461kw (3300hp), of which 2237kw
>(2999hp) is available for traction ( the other 300hp being used to run
>auxiliary equip).  An 81 is fitted with  a 16-645E3B.  A DL (which is older
>than an 82) is fitted with a 12-710G3 , which i think is the same engine
>fitted to 82's.  A DL is reated at 2424kw (3250hp), or 2259kw (3029 hp)
>available for traction.   Unless the 82 has been down rated (which i doubt)
>then this puts the 82 at 30 hp more for traction above the 81.  I have
>always been lead to believe that 81's were better pullers than 82's (and
>better than V/Line G's for that matter).
>
>I think the above statement refers to the 81's gross power output, where as
>the 82 figure reflectd the tractive figure.
>Maybe somebody else can help with exact figures for the 82..l can't seem to
>find them
>
>Stephen Molloy
>
>
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