Smoke box

[westlin]

A quick question I hope soneone can answer. According to my Norman Spink drawings the smoke box tube is 14swg brass, but modelworks used a machined 6mm steel tube. Can any one expalin why the big difference and why so thick. Clearly brass is expensive but is steel the right way to go.

any tboughts.

Stephen

[cplmickey]

I don't have a Britannia but on my Modelworks/Winson 9F the smoke box is aluminium so the extra thickness is needed for strength. On my Winson 7 1/4 Baldwin it's steel but definitely not 6mm thick, more like 3mm. If yours is steel it sounds unnecessarily thick.

Ian