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Ramon..... from an engineering placement point of view....the radial array of the 12 cross tubes appears brilliant . from a thermal transfer question....will the heat from the gas flame be less effective on the tubes outby [furthest away] from the flame?Derek
So that would be why the inspector did not want to see any gaps, the arrows of heat would fly straight through the gaps without making any contact.I would hazard a guess that the gentle spiral gives a better draught than the more turbulent flow that the other pattern Ramon came up with would produce so helping to draw the fire through the flue.J
Thanks for your explanation Derek but I'm afraid I don't have the background to comment furtherI would say however that, excluding 'Meccano', its 58 years since I made my first working (flying) model. Since then I think I can honestly say that I have enjoyed every single moment I have spent making something whatever it may be. Throughout that time however I have tried very hard not to allow the fact that I do not have any academic qualifications in the various subjects tackled to spoil that enjoyment.That is not to appear dismissive - if this works then great, if it doesn't work so well (unlikely I feel) then it's still a 100% improvement on what it was before setting out but I'm afraid I don't have the mental energy to be concerned whether or not this is not going to work to it's most efficient potential - I'm just getting too old for that I would like to add that I hope this is not going to be a catalyst for heated (pun intended) debate - it's just about building a boat and rebuilding the boiler Regards - Ramon
1. heat is like an arrow 2. it will be adsorbed ~~~in the first pass3. little if any of the arrow will continue on past the first point of contact