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Old 02-13-2018, 01:50 AM   #24 (permalink)
freebeard
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They're fat-tired open-wheel cars. The high drag comes from the tacked on wings. The underbody does contribute downforce. It does it by expediting the airflow through a closed plenum with tunnels and induced vortexes. I don't think that adds drag, but I've been wrong before, once.

I talked above about a 'pontoons enclosing the wheels'. More specifically look at the spats on the Template as Xist showed at Permalink #16 (that you keep cutting off). And look at basjoos' Aerocivic:

Aerocivic - how to drop your Cd from 0.31 to 0.17

https://www.aerocivic.com/



It has double-walled side skirts flushed to the inner and outer walls of the tires, 'catamaran-style'. It has zero break-over angle but I think the skirts are conveyor belt material. Notice also the wedged out nose and high boat tail. They work together.

Here's my own theory on how to terminate a Template shape (this one is squircular):



It is an half-bellhorn diffuser that couples a flat bottom to the truncated tail.

Quote:
..and should work as well at half the speed, but not at full speed.
It's all the same from approximately 25mph to approximately 250mph. More benefit going faster.
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Last edited by freebeard; 02-13-2018 at 01:55 AM..
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