A Coarse Guide to the Steam Locomotive for ‘N’ Gauge Modellers

[cmason]

Many thanks John for this marvelous postington - I have been wondering about what a Giesel ejector is and how it works as only last week I purchased on Yahoo auctions one of Mr Kato's models of a Giesel fitted D51 Hokkaido cold weather spec loco as used up until 1975. Train Trax has a description here.

I am now educated in the mystery!

Colin.

[chrism]

Many thanks John for this marvelous postington - I have been wondering about what a Giesel ejector is and how it works as only last week I purchased on Yahoo auctions one of Mr Kato's models of a Giesel fitted D51 Hokkaido cold weather spec loco as used up until 1975. Train Trax has a description here.
I am now educated in the mystery!

There's nothing particularly fancy about it, it's just a more refined form of blastpipe.

Instead of the exhaust steam being simply blown up a big hole (the chimney) with a broad petticoat pipe to make sure it does go up the hole, the Giesl ejector is a more finely tuned combination of a converging coned blastpipe, a converging combining cone to add the smokebox gases and a diverging cone to exhaust the combined exhaust steam and smokebox gases out of the chimney - all multiplied by the required number of these to both allow the cylinder contents to be properly exhausted and to give the required "draw" through the fire and boiler tubes.

It works on exactly the same principle as a brake ejector, water feed injector or, even, a car carburettor.