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Looks good, have a cat!
Do you have any cabin vents? Carbon monoxide is a real danger. Also, I'd love to see a different solution to the side to side motion bracing of the wing, have you considered extending the duckbill spoiler sideways to do that? |
Looks great! I need one of those fastbacks.
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Cheers. Cabin venting is on the to do list. It's pretty hot in there, and will only get hotter now that it has a flat floor. I did make a central spine on the floor for strength and it also acts as a tunnel to pull air through. There is a small forward facing opening. The rear camm tail did go all the way, but now the wing is wider, I will have to make it wider as well, it actually does brace it a lot.. The cables are on big angles to the air stream, meaning the cross section the air will hit it at wont be round (bad for drag). I know it's not ideal, but they have to be there. Still less drag than regular uprights and big end plates. And my uprights/enplates have tapered edges almost to a point. I found a very reasonable price for shipping the fastbacks to the west coast. In a few weeks I could possibly take orders and send over a batch of 20. Some more pics... http://i68.tinypic.com/2e4emth.png http://i68.tinypic.com/295v2ua.png |
Wallet damage report.
https://cimg5.ibsrv.net/gimg/www.mia...d6e5eed96b.jpg Please let me know when you have a solid cost. I have friends on the west coast that drive to Utah frequently. This could be awesome |
They should work out to well under $2000 landed. I will get a firm price by the end of April. |
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Not sure what you don't get, or want me to explain. I have reduced the opening on the front, and put a splitter on. Pretty standard stuff with the exception of the airdam profile. I will wool tuft test it after the State Time Attack round on Friday. |
Won’t the air coming off nose (directed past the wheels) seperate? |
It's a pretty common trick to get additional surface area per given stickout limit.
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A lot of people think I am seperating the airflow down the sides not realising how turbulent the air is at the wheel area. |
Originally Posted by Blackbird
(Post 1474547)
Looks good, have a cat!
: Also, I'd love to see a different solution to the side to side motion bracing of the wing, have you considered extending the duckbill spoiler sideways to do that? "Your cable bracing mounts look too low to reduce lateral movement/vibration, they should be near the top. Also, I would have thought that diagonal/X cable bracing would be more effective, from the top corners to the opposite bottom corners." Better to ask the question here though. |
Originally Posted by Lokiel
(Post 1474692)
"Your cable bracing mounts look too low to reduce lateral movement/vibration, they should be near the top.
Also, I would have thought that diagonal/X cable bracing would be more effective, from the top corners to the opposite bottom corners." Not to take anything away from Lightyear's car, but a good design won't require any cables at all. |
Originally Posted by Neddy
(Post 1474673)
Just can't see what you are thinking, but I'm sure there is some sort of theory behind it...
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There is no additional surface area from before other than the top side of the splitter. I simply pushed the airdam that was there inwards from the centre opening. I designed this as a lower drag setup. The front opening is much smaller now, and the air that was filling up the engine bay is now being forced around the car. |
Originally Posted by lightyear
(Post 1474706)
There is no additional surface area from before other than the top side of the splitter. |
High pressure builds on the upper surface of splitters due to air stagnation; pretty confident that "endplates" would help massively towards that end. On the other side, front end plates side surface area tends to have the opposite results compared to the rear ones.
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The high pressure also pushes on the underside of the bumper beneath the headlights, creating lift that counteracts the downward force on the splitter beneath it. This negates the additional splitter surface area's contributions so it equals out. But I don't know what it does for air heading to the sides. I haven't seen modeling of that.
The car looks really sexy. |
If I made an airdam that went straight down, it would probably have the same downforce as this one if the top sides cancel out the bottom surface area. But I think it's worth experimenting with this design to see if it is less drag or more downforce. I painted the wing red, and extended the camm tail to meet the uprights. There is nothing overly fancy in the whole aero design and materials. It has actually cost me around $100. I bought $80 worth of alloy, the rest of the stuff (cloth, resin, etc) was left overs. The fastback roof and trunk are from the previous design. The doors have been sitting for 8 years unassembled. The cables where made by a good friend, so cost nothing. Yet... But there have been many late nights. http://i66.tinypic.com/2qs1kbq.jpg |
I am interested in more close-ups / brighter pics of how the uprights are mounted.
I am considering fabricating something similar, albeit out of aluminium, for my own project. Thanks! |
I will take more pics at the track tomorrow. |
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