Peter, Welcome to the forum.
Regarding motor size, fit as much motor as you can in your hull. IMO it's better to err on too much power than not enough. You can find many suitable gearmotors in various sizes at many surplus outlets. One of the better choices is https://www.surpluscenter.com. On attaching one shaft to another, the device you use is called a shaft coupling. A good introduction can be found here http://www.mcmaster.com/#shaft-couplings/=4rdi4c. Connecting a rotating (un-powered) wheel to a non-rotating shaft. This is accomplished using a bearing of some type. It can be as simple as a plain bore plastic hub lawnmower wheel rotating on a fixed axle bolt or something more complicated like a ball-bearing hub on a bicycle wheel. A good overview of the many types of bearings and bushings, http://www.mcmaster.com/#bearings/=4rdivf. Attaching a wheel to a rotating shaft can be done in many ways. Typically some type of shaft collar (http://www.mcmaster.com/#shaft- collars/=4rdlx2) is attached to the shaft and then the wheel is attached to the shaft collar in some fashion. Review the build pics at rctankcombat.com for many different ways of doing this. If you haven't figured it out by know but the category intro pages at http://mcmaster.com are a very good source of information for basic mechanical concepts. Steve Tyng -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com Visit the group at http://groups.google.com/group/rctankcombat
