Personally I’m a keen supporter of using the “correct” scale factor of 22.6, and it rather irks me to see 22.5 on the Society banner. Maybe it’s a mistake of course, and it’s not the only one on those banners. In support of the people who put them together some years ago, I know as a former design draughtsman just how easy it is to painstakingly put together a drawing title or note, only to find it mis-spelt as a result of the slow and laborious process of creating it. What I cannot excuse however is the lack of peer review before production of something so important as a society promotion banner.
Anyhow, we digress. The reason for 22.6 was succinctly made by IanT further up this page, and this is why we ought to be quoting the magic 22.6 number in our technical standards. Whilst we need not mandate this scale, it is only right and proper that we acknowledge and promote its use as the technically correct number. The measurements of 17/32” or 13.5mm to the foot need to be placed in context as approximate conversions.
I think that’s all I have to say on the matter, so, happy modelling!
Tim