I find it sad that wonderful paper models of engines and carriages are designed with drab 1-dimensional wheels. That is why I designed a simple mathematical formula to calculate the form of a 3-dimensional wheel with 3 parts. With this improvement, I have been able to improve the excellent models of Albrecht Pirling. If anyone is interested, I also improved a number of my aircraft models (see my latest DC-3 on www.bobscardmodels.net76.net and http://www.papermodelers.com/forum/aviation/23813-dc-3-1-30-rear-alan-roses-beautiful-trophy.html, ) constructing the wheels as made up of numerous paper discs.

Thanks for your input. I usually make my wheels by laminating or rolling strips. I am always on the lookout for new techniques. Thanks for sharing.

[SIZE=+3]This website has a really neat FREE online calculator for doing a truncated cone, the cone that connects the two diameters at either end of the cone (for the train wheel). You can use the angle reference as the end points, or just draw it longer, and you will have gluing flaps. http://www.unikatissima.de/e/?p=2117#calculator [/SIZE]