NACA Window Ducts
#21
Cpt. Slow
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Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,206
Total Cats: 1,138
Nope. Very little enters. Open your window on the freeway, not much comes in. Now imagine your car is hotter, you're in a helmet and safety gear, and you're working fairly hard to muscle your car around track. It all ads up to not enough air without vents.
#27
Elite Member
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Join Date: Dec 2007
Location: San Antonio, Texas
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Keep in mind for those reading this thread whether or not your racing and/or HPDE organization allows you to have the windows up. NASA, where I race, requires the front windows to be completely rolled down. Mine is actually removed from the car completely. So a venting solution that uses the rollup window will not work in my case. But the NACA vent windows will.
#32
The Weekend Racer NACA duct version looks huge. The ducts do not need to be that big to work.
There is a smaller clear lexan version available. I have one of these in place of each of the front quarter windows. They work awesome. The NACA duct is pop rivited to a piece of clear lexan, and installed like a normal quarter window. The NACA is installed at the base of the window, perfectly parallel with the bottom edge (and not tilted up as shown in the Weekend Racer photo).
The outlet points right toward my chest and feels GREAT at speed. As other said, it really does move a lot of air. I use caps from Rustoleum spray paint cans to seal off the duct when I'm towing the car. The caps also work great for track use to keep the rain or cold air out on wet / cold days. I push the caps in from the outside and have never lost one in transit or on-track. I have lost them around the garage or pits though, but luckily, they are cheap to replace.
I wouldn't want them on a street car, but love 'em on the track car.
There is a smaller clear lexan version available. I have one of these in place of each of the front quarter windows. They work awesome. The NACA duct is pop rivited to a piece of clear lexan, and installed like a normal quarter window. The NACA is installed at the base of the window, perfectly parallel with the bottom edge (and not tilted up as shown in the Weekend Racer photo).
The outlet points right toward my chest and feels GREAT at speed. As other said, it really does move a lot of air. I use caps from Rustoleum spray paint cans to seal off the duct when I'm towing the car. The caps also work great for track use to keep the rain or cold air out on wet / cold days. I push the caps in from the outside and have never lost one in transit or on-track. I have lost them around the garage or pits though, but luckily, they are cheap to replace.
I wouldn't want them on a street car, but love 'em on the track car.
#35
On a street car, I wouldn't run them. Perhaps look into the "cool breeze scoop"? At one point they were making them to clip onto the side windows. A friend of mine was beta testing for them a year or so ago.
#36
Cpt. Slow
iTrader: (25)
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,206
Total Cats: 1,138
I've done a lot of time with mine on the streets, the paint cap works great. If it's truly cold (less than 40) and I need to drive it on the streets for some reason, painters tape seals up the paint can cap rather well.
It's good enough for me that it keeps the rest of the cockpit cool, just moving cool air in and pushing hot air out the window. Or at least that's the goal.
It's good enough for me that it keeps the rest of the cockpit cool, just moving cool air in and pushing hot air out the window. Or at least that's the goal.
Last edited by curly; 06-07-2012 at 06:17 PM.
#37
Bob