Thingiverse
fan velocity stack
by robbw4u
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velocity stack for PC fan, smooth air for wind tunnel or whatever use you can think of.
Scale it to whatever size works for you 20 mm, 40 mm, 50 mm. this could be modified slightly to be used on a carburetor
Scale it to whatever size works for you 20 mm, 40 mm, 50 mm. this could be modified slightly to be used on a carburetor
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