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Old 07-07-2017, 10:27 AM   #11 (permalink)
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Happy Friday everyone!

Stubby79- Would love to have you as the first owner!!

Old Tele man- You pegged it, design completely based on Salt Flats belly tank racers..

ar5boosted- Totally agree on artwork color scheme on the next one...This one will be covered in sponsor/supporter logos pretty soon. (And as a fellow old timer, I totally agree on perceptions being real enough!)

Here are some more pics.. Will start a build/work thread soon if okay...

Have a great weekend,

Ray














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Old 07-07-2017, 03:20 PM   #12 (permalink)
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It looks like a nice effort. What sanctioning body's record are you going for?

Where does the 0.089 Cd figure come from?



This is the most informative. After the first pictures I thought you'd cut a full teardrop canopy in half. Do you think it would be possible to put sprockets on the top of the kingpins and run a chain inside the upper A-arm?
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Old 07-08-2017, 01:22 PM   #13 (permalink)
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Quote:
Originally Posted by freebeard View Post
It looks like a nice effort. What sanctioning body's record are you going for?

Where does the 0.089 Cd figure come from?



This is the most informative. After the first pictures I thought you'd cut a full teardrop canopy in half. Do you think it would be possible to put sprockets on the top of the kingpins and run a chain inside the upper A-arm?
Hey Freebeard! Thank you... Well, I'm not real smart when it comes to the sanctioning body stuff...planning on going for Guinness, and then just publishing our work with witnesses on our pr stuff...

On CDa, I'm not the Aero geek in the project, but the two guys that are did the math by hand...calculating square frontal area with laminar flow. Their numbers were actually (.087-.089) at 60 mph. They say it gets better past 100...but I don't think I'll be trying THAT this week!

Totally lost me on sprockets on the kingpins and chains in the A Arms???
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Old 07-08-2017, 09:04 PM   #14 (permalink)
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Small-f freebeard, I'm not that important.

What's the current Guiness record? I really don't follow them.

Generally, with sanctioning bodies, the rules determine what can and can be done. Of course, the most unbounded would be your inspiration — Bonneville. You could look into whether you can pass scrutineering there.

You might review the materials at Index of Phil Knox Aerodynamics Seminars & Mod-data lists. I don't car to dig through it myself, but generally a free body in ground effect can have a Cd of 0.05-0.09. See also The body shape of minimum drag

Once you add fully spatted wheels (three or four) it's hard to reach 0.12. When you figure in the open front A-arms it goes north of that. You might send a Personal Message to aerohead and invite his comment. I think he would like to see it.

That other thought was unpremeditated. If the top of the kingpin passed through the upper Heim joint or whatever to a sprocket, then a chain running in the hollow upper A-arm would allow eliminating the drag from the steering arms and the drag link/idler arms (or whtvr). Those small round tubes probably have as much drag as the A-arms which are thicker but have a better fineness ratio.
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Old 07-09-2017, 02:41 PM   #15 (permalink)
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Where'd you get the canopy?
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Old 07-10-2017, 10:04 AM   #16 (permalink)
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Kudos on such a good looking and working build! I think the wheels, the front arms connecting them to the body, and their lackof fairings mean the Cd your people calculated is probably optimistic. Looking for fairings for those wheels and arms is definitely one of the key places to improve that disappointing 69mpg you just recorded. Right now those tires and wspoked wheels are giant spinning mess-fans mucking up your aerobody's pretty nice shape.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

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Old 07-10-2017, 10:43 AM   #17 (permalink)
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Where did you get the lighting on the front of the exterior, I am liking that setup!
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Old 07-15-2017, 07:43 PM   #18 (permalink)
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That's an interesting project. I have already considered to attempt something similar and try to register it as a road-legal vehicle.

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