Alan, I agree and would add that in my experience a decent size 5inch boiler = is a better proposition to make than a small 3.5 inch gauge boiler. Regards IP "Life should NOT be a journey to the grave with the intention of = arriving safely in an attractive and well preserved body, but rather to skid in sideways, Champagne in one hand - strawberries in the other,=20 body thoroughly used up, totally worn out and screaming WOO HOO - What a Ride!"=20 =20 "Never drive faster than your gaurdian angel can fly" =20 Priest & Sons Model Engineers http://www.kinvermes.pwp.blueyonder.co.uk/p1.htm -----Original Message----- From: modeleng-bounce@xxxxxxxxxxxxx = [mailto:modeleng-bounce@xxxxxxxxxxxxx] On Behalf Of alan Stepney Sent: 29 September 2005 18:49 To: modeleng@xxxxxxxxxxxxx Subject: [modeleng] Re: [modeleng] Re: [modeleng] Re: 3=BD versus 5 Whilst the main concentration has been on the size you can machine, the=20 boiler should also be given some thought. A round topped parallel boiler is MUCH easier to construct than a = belpair=20 taper boiler. Even if you are wealthy enough to buy it, the latter type = of=20 boiler will cost a great deal more. As for backhead fittings, you CAn make them closer to scale than LBSC = did,=20 it all depends upon how much work you want to put in. Similarly, you can = add scale features and make it more true to life, if you so wish. At the = same time, the prime purpose of a steam loco is to that it should=20 run. If you built one as per the "words and music", you could always add = finishing details at a later date, and could also make scale backhead=20 fittings at your leisure. Alan ----- Original Message -----=20 From: "Jem Harrison" <Jem.Harrison@xxxxxxxxxxxxxxx> To: <modeleng@xxxxxxxxxxxxx> Sent: Thursday, September 29, 2005 1:51 PM Subject: [modeleng] Re: [modeleng] Re: 3=BD versus 5 Rich, Bear in mind that I am coming into model engineering from a background = of building models in 7mm and 10mm to the foot, in which I tried to get the details as near to scale size as the Mark 1 eyeball could achieve.=20 MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to,=20 modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the = subject line. MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.