Hi Randy,
        I am building a rotary powered version of the Long EZ known as the Limo EZ,  I am using the submerged portion of a NACA duct with a modified P51 scoop which makes it look more like a F16 intake.  It should slow the air down and recover pressure. By using the submerged area the cowl can favorably fair into the prop.

Joe Berki
Limo EZAt 07:51 AM 9/14/2004 -0700, Smith, Randy wrote:

This is precisely why I want to decide early on if I should go to the trouble to build the NACA inlet verses the P-51 style scoop.  I m leaning heavily toward the scoop as this is easier to construct and I gain some (although miniscule) room in the fuselage for something else.

 

-Randy

 

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From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Perry Mick
Sent: Tuesday, September 14, 2004 8:54 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] NACA vs. P51 Scoop

 

Dale Rogers wrote:

Randy,

   You asked:

1.      I am building a Cozy
MKIV.  It uses an NACA scoop embedded in

the belly to provide cooling air.  I am thinking
of not building the

NACA scoop as I plan to use some sort of Meredith
effect scoop/plenum

(ala the P-51) for cooling. 
Thoughts?

   There are flyers who have successfully
used each approach.  For example, John Slade gets adaquate cooling

with a NACA scoop; and, the last time I looked, Perry
Mick 

was using a P-51 style scoop on his Ducted Fan
L-EZ.

Dale R.

COZY MkIV-R13BNA #1254

Ch's 4, 5, & 23

I still have the NACA. I have no cooling problems because the ducted fan assists airflow through the rad. About a year ago I lowered the inlet lip about 1", increasing inlet area to the rad, and making sort of a scoop out of the NACA. But it had no effect. My rad cooling is sufficient, but it's limitation is probably my small rad size and not airflow.
Eventually I will probably grind all that NACA stuff off the belly and use the original Long-EZ P-51-type scoop. My LEZ fuselage tub was fabricated to the original design, the NACA was added on later, unlike the Cozy, which I think has the NACA designed into the fuselage tub.

Perry