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by longer what do you mean? do you mean go further back?
but do you think it needs to be taler then it is now?
due to the fact that I've sliced my fingers open 8 times now in 1 day with a 7 inch(which i shattered) any safety ideas for testing purposes?
a 10 inchish computer fan
also, i cant seem to find any info about ducted fans and how to make them correctly for optimum thrust
but should i make the duct into a cone or have a wder opening or anything like that?