Rudyard Kipling wrote a poem called ‘The sons of Martha‘ which is a gentle hymn of praise to those in society whose graft keep things going while others enjoy themselves. I like to think it’s about engineers. It contains a line which I really like: ‘They do not preach that their God will rouse them a little before the nuts work loose‘. If I’d paid a little more heed to that, I wouldn’t now have a pile of wreckage rather than a working drone. I failed to properly tighten the propeller nuts, and sure enough one came loose at altitude. It makes for an amusing video (I hope I haven’t given away the ending), but it may be a little while before the drone flies again.