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From: Jerry Hey <jerryhey@earthlink.net>
Subject: Re: [FlyRotary] Re: NACA scoops
Date: Wed, 19 Oct 2005 19:30:35 -0500
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

It has been a couple of years but I did read the NASA report that  
said the NACA style duct was not recommended for induction or  
cooling.  The report was based on experimentation.  I believe it  
stated that the max pressure recovery of NACA duct was .8.   Sorry I  
can't refer you to the document except to say it was in the NACA  
archives.  Jerry
On Oct 19, 2005, at 9:05 AM, Ernest Christley wrote:

> rijakits wrote:
>
>
>>
>>     Remember the inventors of the NACA-duct did recommend to NOT use
>>     it as a pressure-recovery intake (what we need for our our car
>>     style radiators)
>>
>>
> I've heard this repeated so many times, and yet I've never been  
> able to find the report that said it.  I believe it is well on its  
> way to becoming an old-wives-tale.  I've looked for a while in vain  
> to find the exact quote this morning, but the closest I've been  
> able to find was more along the lines of "we didn't test that, so  
> we don't recommend it."
>
> "We don't recommend it, because we haven't tested it" is NOT the  
> same as, "we don't recommend it because we found it doesn't work."
>
> All of the reports are online at naca.larc.nasa.gov.  That address  
> starts you at the search page.  'submerged inlet' brings up the  
> reports on NACA scoops, with the most germaine for our purposes  
> being located at  http://naca.larc.nasa.gov/reports/1951/naca- 
> tn-2323/ .  I'll keep looking for the quote I'm referring to above,  
> but I would really appreciate a pointer to the report that says,  
> "We found submerged inlets to be deficient for use with radiators."
>
> -- 
>         ,|"|"|,                                    |
> ----===<{{(oQo)}}>===----        Dyke Delta         |
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