Before the year 9 team began the build of Plume Power, some fairly intensive CAD sessions (it took 7 versions to get it right) resulted in a comprehensive set of plans for the team to follow:
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| Pro Desktop assembly (including driver!) |
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Plywood chassis tub bodywork over the top is to
be Correx thin corrugated plastic. |
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Looking pretty like the CAD drawing!!
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| carefully dimensioned 2D set of plans. |
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| After about an hour and a half in the virtual wind tunnel. This is free software from Autodesk (Flow Design) |
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| Nice smooth flow lines.... |
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| Not much turbulence to the rear. |
The final analysis with the wind speed set at 13 metres per second (30 mph) gave a Coefficient of drag of 0.28 and a drag force of 6.749 Newtons.
Not sure if this is good, bad, indifferent or even useful until I consult our resident Physicist, Mr. Raymond.........sure is interesting and cool though!!!!
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OK!! by comparison here is a wheels-out car I designed a while back (fairly comparable
to the yr 10-11 Projectile. Its test results are a CofD of 0.46 and a drag force of 12.37 Newtons
That's quite a bit of difference......the year 10's and 11's may have some competition with Power!! |
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