@Aravona Yes indeed and I am not strictly to the rules of SE sometimes. If the topic is of value for example. Only if there are too many answers with discussion-like style we should close it I think.
And remember SE rules are interpreted slightly differently on each site, eg Skeptics is very strict, but Parenting not so much. We get to steer that as we grow
@RoryAlsop well the thing here I think probably the same with parenting is actually opinion based Q&A won't always be closed...
Yeah if it's too heavily opinion based I get it will, but a lot of the fun of the outdoors involves risk taking based on your opinion of things, so you get a lot of 'I personally wouldn't do this but you'd go about it by....' answers :)
@Aravona LOL "A top engineer has devised a formula" ... this is not a new formula or anything, it is indeed very old and just uses the definition of the drag coefficient: en.wikipedia.org/wiki/Drag_coefficient