Re: (TGR) L and M class Garratts

["Derick Wuen" <cullend@webone.com.au>]

You are right, of course.

As much as I deplore the "unfitness" for purpose of the M, I do so wish I
could see (and hear) one in action. Dwelling on the imagined sight and sound
of one working through the Tassie midlands caused the brain to slip out of
gear.

Thanks for the correction.

John Duncan McCallum wrote in message <3947505E.1F6DF948@melbpc.org.au>...
>Derick Wuen wrote:
>
>Much snipped
>
>> Do you know the crank settings on the M? If each crank was at 180 degrees
to
>> its inside mate (implied by simple rocking bar drive to inside valve
gear)
>> and the left and right machinery was at 90 degrees, imagine the
noise!.....
>> talk about boogie, eight beats to the bar! from each engine! now imagine
a
>> frosty winter's morning on Rhyndaston bank 1 in 40, with engines slipping
in
>> and out of synch!
>
>I don't know if you're being facetious here, but a 4 cylinder engine
>with inside
>cranks at 180 degrees from its outside counterpart usually does not make
>any more
>noise than an equivalent 2 cylinder machine. There are, in fact, only
>four exhaust
>beats per revolution, as the inside and outside cylinders exhaust
>simultaneously.
>This is also because the cylinders on a four cylinder machine are
>usually smaller
>than those on a two cylinder machine of the same power.
>The only four cylinder engines that I know of that had eight beats per
>revolution
>were the locos designed by Holden of (I think) the Northeastern Railway
>in
>England. This was because he used a more complicated version of the
>Gresley
>conjugated gear, which required the cylinders to be set at roughly 45
>degrees.
>
>--
>==========================================
>John McCallum, member Melbourne PC User Group,
>email <mccallum@melbpc.org.au>