Post your DIY aero pics
03-29-2018, 10:29 AM
#1641
Senior Member
Join Date: Oct 2011
Location: Northridge, CA
Posts: 842
Total Cats: 412
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?
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?
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03-29-2018, 04:29 PM
#1643
Senior Member
Join Date: Aug 2009
Location: melbourne aus
Posts: 515
Total Cats: 92
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...
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...
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03-29-2018, 09:30 PM
#1647
Senior Member
Join Date: Aug 2009
Location: melbourne aus
Posts: 515
Total Cats: 92
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.
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03-29-2018, 10:51 PM
#1651
All-round "Good Guy"
Join Date: Dec 2009
Location: Brisbane, AUSTRALIA
Posts: 993
Total Cats: 245
"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.
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03-29-2018, 11:08 PM
#1652
Senior Member
Join Date: Oct 2011
Location: Northridge, CA
Posts: 842
Total Cats: 412
Not to take anything away from Lightyear's car, but a good design won't require any cables at all.
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03-29-2018, 11:20 PM
#1653
Junior Member
Join Date: Jan 2016
Location: Atlanta, GA
Posts: 452
Total Cats: 310
Drag trade off for additional surface area(downforce). Those high pressure pockets he has built in front of the wheels will create tons of downforce, but at the cost of being very draggy.
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03-30-2018, 12:26 AM
#1654
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Join Date: Aug 2009
Location: melbourne aus
Posts: 515
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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.
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03-30-2018, 04:18 AM
#1656
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Join Date: Jul 2015
Posts: 1,014
Total Cats: 140
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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03-30-2018, 06:27 AM
#1657
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Join Date: Nov 2008
Location: Tampa, Florida
Posts: 20,652
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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.
The car looks really sexy.
Last edited by sixshooter; 03-30-2018 at 06:45 AM.
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04-04-2018, 03:04 PM
#1658
Senior Member
Join Date: Aug 2009
Location: melbourne aus
Posts: 515
Total Cats: 92
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.
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.
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04-04-2018, 05:09 PM
#1659
Junior Member
Join Date: Mar 2016
Location: Lexington, KY
Posts: 150
Total Cats: 75
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 am considering fabricating something similar, albeit out of aluminium, for my own project.
Thanks!
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