In the beginning of August I wrote about the cardboard models from this site.Since then(or just recently tbh) I've built some:the oilpump,steam engine,experimental glider and coinbank.The first one works fine,the second one works mechanically fine but not with the balloon(probably some airleaks),the third one needs some....experimentation and the last one works almost fine(but sometimes with some help).
The coinbank looks like an interesting project to make in metal and I'm planning on making an oilpump from metal as well.
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