Just in case anyone wanted one, I've put the Lasercut Rocketry Ruler design I put together for the recent rocket design workshop I ran onto thingiverse. The ruler is angled so that however it is placed on a tube/cylinder you will always be able to mark/measure a straight line parrallel to the centre line of the tub... very useful for all kinds of things but certainly for marking rocket fin placements! If you are wondering what the symbols at the ends are they represent the centre of pressure and centre of gravity the first of which must be behind the other to make a stable rocket. Feel free to tip me millions on thingiverse! :)
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