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-   -   Reverse NACA ducts (https://www.miataturbo.net/aerodynamics-119/reverse-naca-ducts-100374/)

1RMDave 06-10-2019 01:58 PM
Reverse NACA ducts
 
Hey, looking to do some hood venting. I found these NACA ducts on ebay https://www.ebay.com/itm/NACA-air-ve...8AAOSw-0xYPZJd they are aluminum and come off a Grumman Tiger airplane for under $30 each. Thoughts on using these backwards for hood vents? Here is some info on running them backwards:

jpreston 06-10-2019 02:20 PM
I remember seeing wind tunnel test results a few years ago for naca ducts mounted backwards. The conclusion was that the naca shape has no real benefit when mounted backwards, and a simpler vent shape is equally or more efficient. The naca shape really shines as an inlet.

It sounds like the nascar teams just did it because of a rules loophole. Wording like "no vents or holes may be placed in windows other than NACA ducts" with no specification for duct orientation. Their only options were backwards naca duct extractor or no extractor, and the backwards naca duct was the winner.

ryansmoneypit 06-10-2019 03:29 PM
i also found that they are not great when run backwards

ThePass 06-11-2019 06:29 PM
^ What they said.

1RMDave 06-12-2019 01:32 PM
Sounds good, thanks for the input! Gonna go with the 5 piece set of R Theory vents.

matrussell122 06-12-2019 01:34 PM
Originally Posted by 1RMDave (Post 1538303)
Sounds good, thanks for the input! Gonna go with the 5 piece set of R Theory vents.
do the singular vents

1RMDave 06-12-2019 01:40 PM
Originally Posted by matrussell122 (Post 1538304)
do the singular vents
I do like the Singular vents with the gurney flaps however this is one of those rare instances that I get to support the Canadian economy and probably save a lot on shipping. I may add my own gurney flaps to the R Theorys.

acedeuce802 06-12-2019 01:46 PM
I thought R Theory's business was on hold?

1RMDave 06-12-2019 03:47 PM
Originally Posted by acedeuce802 (Post 1538309)
I thought R Theory's business was on hold?
Oh I dunno... Still taking orders on website...

1RMDave 06-12-2019 05:32 PM
I sure hope I can get R theorys. Singulars will be $260usd

dc2696 06-14-2019 05:15 AM
Originally Posted by 1RMDave (Post 1538357)
I sure hope I can get R theorys. Singulars will be $260usd
Have the 5 piece R Theory on route out west, no issue with getting them ordered. Those singulars are just brutal after conversion and shipping :(

1RMDave 06-14-2019 07:05 AM
Originally Posted by dc2696 (Post 1538547)
Have the 5 piece R Theory on route out west, no issue with getting them ordered. Those singulars are just brutal after conversion and shipping :(
Did you order them off the website?? How long ago did you order them? Thanks for chiming in, I'd still like to order the R Theory's! I can't believe some vendors want $65 usd to ship the Singular vents, that's almost $100cad and they ship flat so obviously no big box needed.

dc2696 06-14-2019 03:38 PM
Originally Posted by 1RMDave (Post 1538552)
Did you order them off the website?? How long ago did you order them? Thanks for chiming in, I'd still like to order the R Theory's! I can't believe some vendors want $65 usd to ship the Singular vents, that's almost $100cad and they ship flat so obviously no big box needed.
Yup ordered off the website on the 7th last week.

1RMDave 06-15-2019 11:09 AM
Originally Posted by dc2696 (Post 1538629)
Yup ordered off the website on the 7th last week.
Did you get a tracking number or anything indicating they are on their way?

dc2696 06-15-2019 09:14 PM
https://cimg2.ibsrv.net/gimg/www.mia...6f6f627835.jpg
Originally Posted by 1RMDave (Post 1538710)
Did you get a tracking number or anything indicating they are on their way?
Edit: test fit picture, slight interference with hood latches.


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