I use a flux cored 63/37 solder which is a eutectic mix minimising the chances of a high resistance cold solder joint. I would recommend it if you can get it, but in these health and safety conscious days you may be forced to use a lead frree alternative.
Sorry if this pisses in your fireworks, but it is better to know your goal is off before you get too far in to the project. The scale speed is the square of the scale factor in order to scale time as well as distance, 61" is 1:7.5 scale of 38', so to do a realistic looking scale 75mph you need to be doing a real 27mph.
Paul Upton-Taylor, Greased Weasel Racing.
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