I got the new improved windtunnel running and the tried my reference 9.5" nock test shaft. It started off stable then started to wobble and ended up with the nock end swinging round in circles almost touching the wall of the tube... Hmmm?
I slipped a piece of slit pipe down inside the flared section and the stabilised! I took noted the test figures and the figure for the drag was exactly the same as previous test.
Oh well it looks like the fancy wooden flared inlet will be coming off!
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