Dnevil at 21:37, 1 September 2020

2020-09-01T21:37:02Z

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			[[Cateogry::Steam Locomotive Parts]]
			[[Category:Construction]]
	[[A Multi-Nozzle Exhaust for Small Locos]]		[[A Multi-Nozzle Exhaust for Small Locos]]

Dnevil at 22:37, 9 February 2015

2015-02-09T22:37:36Z

← Older revision		Revision as of 17:37, 9 February 2015
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	[[A Multi-Nozzle Exhaust for Small Locos]]		[[A Multi-Nozzle Exhaust for Small Locos]]

	George Hill, ~~Tornoto~~, Ontario		George Hill, Toronto, Ontario

	<i>[[The North American Live Steamer]]</i>, Volume 1 Number 4		<i>[[The North American Live Steamer]]</i>, Volume 1 Number 4

Dnevil at 04:28, 9 February 2015

2015-02-09T04:28:12Z

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	<i>[[The North American Live Steamer]]</i>, Volume 1 Number 4		<i>[[The North American Live Steamer]]</i>, Volume 1 Number 4

			[[File:GeorgeHill MultiNodeExhaust.jpg\|thumb\|right\|400px]]

	The six nozzle exhaust shown in the sketches I made for my 2-1/2 inch gauge		The six nozzle exhaust shown in the sketches I made for my 2-1/2 inch gauge

Dnevil: Created page with "A Multi-Nozzle Exhaust for Small Locos George Hill, Tornoto, Ontario The North American Live Steamer, Volume 1 Number 4 The six nozzle exhaust shown in the s..."

2015-02-09T04:22:50Z

Created page with "A Multi-Nozzle Exhaust for Small Locos George Hill, Tornoto, Ontario The North American Live Steamer, Volume 1 Number 4 The six nozzle exhaust shown in the s..."

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[[A Multi-Nozzle Exhaust for Small Locos]]

George Hill, Tornoto, Ontario

[[The North American Live Steamer]], Volume 1 Number 4

The six nozzle exhaust shown in the sketches I made for my 2-1/2 inch gauge
loco last fall (1955). Have tried out several nozzle caps; one having 4 holes
on a circle with one central hole was given first chance, the remainder all
being the six hole type as sketched. Why a six hole nozzle? Well, now, ain't
6 holes about the easiest to lay out in a circle? Try laying out a 7, 8 or 9
hole one and you will see (refer to [[Bolt Circle Layout]]).

Of course a smaller nozzle will generally clear up a shy steamer; but in my
opinion, of all the things that can be done, this is the last resort.
Previous to making this multi-nozzle thing, my loco ran with a single 1/8 inch
diameter nozzle and a 5/8 inch bore liner in the stack; the blower had to be
left on a little to keep up the steam pressure, especially when Mr.
Axle-Driven Pump commenced business. The stack line is now removed, and with
the multi-nozzle doodad, the pops get busy as never before, and without the
help of the blower once the loco is rolling.

The multi-nozzle exhaust is no new thing in American full size locomotive
practice. Since before 1927, the Norfolk & Western Railroad have used them.
Maybe I have not been listening, so I have not heard of any small loco so
equipped around this part of the world. The latest locomotive test bulletin
from Britsh Railways, also independent observers of locomotive performance
over in England, have established the fact that a certain class of loco known
as a '''Spam Can''', is a "most effective and capable engine", and that the
multi-nozzle exhaust has a "definite advantage".

While my sketches of the apparatus are for 2-1/2 inch gauge, the larger gauges
will be able to enlarge the little one, or devise their own proportions to
suit. Six holes seems to be the least that can be used to get decent coverage
of the stack at the top. It will be noted that the jets of steam do not quite
fill the stack; there is a small amount of space for the smoke to get away!
I can assure all interested that the nozzle cap shown does not permit any back
flow down the stack. I now test all blower and front end adjustments before
going to the track by means of a lazy naked flame, such as a lighted match;
just run it around the rim of the stack while steam is being worked, with the
engine jacked up, actually "proved by fire". Alignment of the nozzle box is
obtained in the usual way, in this case by means of a 1/8 inch rod pushed into
a reamed hole in a cap about 1/8 inch thick. The nozzle box is silver
soldered to the exhaust pipe. Top edge of box is only 1/32 inch wide and
faced dead flat, so that caps sit down and without any fear of blows at
exhaust pressure. The shallow spigot on the nozzle caps is fitted with 0.003
inch to 0.005 inch clearance in the box. No gasket is used at this joint, I
hate small gaskets. The nozzle caps can be changed in a few minutes, even in
2-1/2 inch gauge, and with no fear of disturbing alignment of anything. I
guess the sketches will provide enough information for any Live Steamer to go
ahead and engineer a multi-nozzle exhaust for his engine, even so, I would be
pleased to answer any inquiries that might arise.

Last, but not least, because the area of the six nozzles is about 43%
larger than the single 3/32 inch nozzle required to steam the loco freely,
she operated with so much less back-pressure on the pistons.

A Multi-Nozzle Exhaust for Small Locos - Revision history

Dnevil at 21:37, 1 September 2020

Dnevil at 22:37, 9 February 2015

Dnevil at 04:28, 9 February 2015

Dnevil: Created page with "A Multi-Nozzle Exhaust for Small Locos George Hill, Tornoto, Ontario The North American Live Steamer, Volume 1 Number 4 The six nozzle exhaust shown in the s..."