Q: One very common traditional means of delivering feed water to a boiler was through a clack-valve on the back plate and along a pipe past the firebox to the front end of the boiler. Does this arrangement act as a basic form of preheating as the feed water passes the firebox end of the […]
In Feb 2017, Chris Newman wrote to David Wardale to ask if there was any justification in the suggestion that the predicted evaporation rate for the 5AT of 17,000 kg/h might be unrealstically high, particularly with coal-firing. He pointed out that in lines [197] and [198] of FDC 1.3F a maximum specific burning rate for […]
The following comes from a “Is it just a Phantom” – David Wardale’s response to Herr Ebel published in Lok Report in March 2001: “The proposed working pressure of 21 bar is less than the maximum successfully used in America, and the normal nature of train operation will give a mean boiler stress significantly less […]
The following answer is taken from Wardale’s response to an unpublished letter from Bryan Attewell written in response to Wardale’s two-part article “Steaming into the Future” published in Steam Railway magazines #272 and #273 (see ‘Articles and Letters’ page of this website): “Mr Attewell would like a larger boiler, but what counts most for steam […]
The following is taken from Wardale’s response to an article by Bob Butrims published in Locomotives International #56 which itself included a response to the artlcle “What Could You Do With £1.7 Million? David Wardale Answers” as published in edition 55 of the same magazine. Bob’s response included the comments that: “there is the problem […]
David Wardale has proposed that the 5AT be fueled with “gas oil“, saying it was “equivalent to diesel“. In fact, gas oil is diesel fuel but without the dyes which show it has had the road tax paid. Note – the possibilities of using “greener” fuels in the 5AT are discussed in other sections of […]