It's not Royal Union. It's Royce Union. And it's not worth anything. It's about the worst quality bicycle anyone could ever imagine.
Yes, but would be heavy and not as strong as steel.
1.37 kilos would just be enough for a rather light bicycle frame, without any parts stuck to it.
Sand it down and repaint I would think would be the way to go.
Yes but it is hard you may want to take it to a welding shop because they might be able to fix it but they may not know how to so it would be easiest to get a new bicycle.
Oh, plenty of places. I'd recommend starting by giving the local bicycle club a call, they should be able to recommend a dealer that has a good selection of frame sizes available. The cheaper way would probably be simply to buy a MTB with a small frame, but it would probably need some further adaptation to suit the purpose.
It is a misconception that Isaax Johnson invented the bicycle frame. He did patent a modern looking folding bicycle frame in 1899. Its parts could be taken apart for more compact storage. Prior to Johnsons invention, Comte Mede de Sivrac and Karl von Sauerbronn built primitive versions of the bicycle in 1791 and 1816 respectively. The frame of John Starley's 1885 "safety bicycle" resembled that of a modern bicycle. Following Starley, there was an early bike design by Harmon D. Moise which included a freewheel that allowed the rider to coast, and the pedals would remain in one position during coasting.
A bicycle
Describe how you would measure the mechanical advantage of a bicycle.
No. That would be a very light bicycle
A bicycle often "coasts along".
When you pass a bicycle, you pass it the same way you would if it is a car.
No way of telling. It's just as much about the build as it is about the material and the target weight. For the same weight and build quality, the aluminium frame will be stronger, as it can have more material in it. If build quality is the same, and you require the aluminium frame to be lighter, then the chrome moly frame may be stronger. If you compare a poorly built frame to a well built frame, the poorly built frame will be weaker, regardless of material.