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Old 09-24-2019, 03:42 PM   #3171 (permalink)
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If everything that hangs out is streamlined with equal care, and there are not interference issues, the extra skin drag is the main penalty. More frontal area is often pretty cheap if you can use the volume.

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Old 09-24-2019, 04:07 PM   #3172 (permalink)
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The interference issues are what I'm getting at. I know from my yarn testing that anything that disturbs the flow, disrupts the flow quite a long way downstream, likely to the tail end of the vehicle and beyond into the wake. I suspect the Morelli form which is so nice with no interaction with the ground is so severely compromised by suspension and wheels that a different approach could be more fruitful, say, like the Pillbug.

P.S. I mean yes the Morelli form is what it is because of it's critical proximity to the ground plane. I meant interaction with the ground via wheels 'n' stuff.
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Old 09-24-2019, 04:51 PM   #3173 (permalink)
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They're flying in loose formation. Agreed that interference drag is as/more important than skin friction, but if the gap is treated as a converging/diverging duct it could be minimal.

Given the lesser frontal area, the competing theories deserve testing.
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Old 09-24-2019, 07:24 PM   #3174 (permalink)
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I noticed that as time went on the X-Prize winner Light Car's wheel fairings became more and more integrated. Incidentally, that pretty much removed the reason for having the in-wheel suspension. I'm betting wind tunnel work at yaw angles proved disastrous for the fairings.
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Old 09-24-2019, 08:37 PM   #3175 (permalink)
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Dynamic trim tabs on the pontoons?

edit: It took a while to find it, but I believe this was an early Edison2 concept drawing.

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Old 09-25-2019, 08:47 AM   #3176 (permalink)
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Mercedes studied this and all else being equal, they concluded a single form car has lower potential drag, than a multi form car.
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Old 09-25-2019, 09:35 AM   #3177 (permalink)
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MB does seem to have worked on the aero of their cars. They look like they know what they are doing.

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Old 09-25-2019, 11:09 AM   #3178 (permalink)
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severely compromised

Quote:
Originally Posted by Frank Lee View Post
The interference issues are what I'm getting at. I know from my yarn testing that anything that disturbs the flow, disrupts the flow quite a long way downstream, likely to the tail end of the vehicle and beyond into the wake. I suspect the Morelli form which is so nice with no interaction with the ground is so severely compromised by suspension and wheels that a different approach could be more fruitful, say, like the Pillbug.

P.S. I mean yes the Morelli form is what it is because of it's critical proximity to the ground plane. I meant interaction with the ground via wheels 'n' stuff.
Adding wheels to the body doubled the drag,@ 0.35,then after body/wheel integration ended up with Cd 0.23 in production form,if memory serves me.
The body alone,could go as low as Cd 0.055, but it required a ridiculous ground clearance,precise inclination,and rear knife edges.
Tesla has two or three cars in production with the Morelli-shape Cd.
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Old 09-25-2019, 05:58 PM   #3179 (permalink)
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Car and Driver article cited Cd .22 for the Porsche Taycan EV if I read it right.
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Old 09-26-2019, 07:07 AM   #3180 (permalink)
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Santa's High-Speed Sled
Dark Roasted Blend: Santa's High-Speed Sled

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This is the high-speed motorscooter frame built by Piaggio & Co, S.p.A (Vespa) in 1951.

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- a helicopter made in 1967 specifically for a "James Bond"-like movie called "Dick Smart, Agent 2.007". In the movie it could dive in the sea, fly like a helicopter and drive like a normal scooter.

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- another aerodynamic frame for a scooter.

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