got to test fly it today...it went up(B6-4), it drifted quite nicely. oh right, it whistled, so it is a sounding rocket. whistling was planned, we were not able to see if it also spun. pic showing one of the whistles (2 total) made from half a bobber.
Thanks chad.
well I started by cutting a bobber in half, cleaned out the tube that runs through a bobber(so they will not sink), which left a 3/16"(approx) hole. then used CA to glue the hemisphere to the fin. when air flows over the fin/whistle sound is emitted (just like blowing across the top of a soda bottle). I would guess that my bird needs to get up to 40-50mph before the whistle gets audible.
'cleaned' as removed. I wanted a hollow plastic sphere, though I suppose that one could use a plastic spoon if you wanted a 'cleaner aero profile'. I used a red/white 1/2" dia plastic bobber(not foam). a bigger one should produce a lower pitch(due to a larger resonating cavity), not sure what effect the hole size has.
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