REFLECTOR: XLFG Intake Air

[Kevin Baker]

Hi Geoff
I've heard the same thing about the exhaust and was thinking of the same.

I would be interested in what you find on the exhaust.

Thanks
Kevin Baker

.

On Mar 21, 2013, at 6:26 AM, Geoff Gerhardt <geoff.gerhardt at gmail.com> wrote:

> Mark,
> 
> I am running unfiltered air from the top cooling NACA to my intake and it is working fine for me.  But, I've heard others talk about improved manifold pressure from a ram air intake.  I wonder if at high altitude cruise it might be beneficial.  I would think a ram air intake (a scoop that hangs out into the wind) would be better than a NACA intake for producing better intake pressures, tho.
> 
> I need to make some changes to my cowl and repaint this summer, so I was going to experiment with a ram air scoop now that I have lots of data on the NACA cooling intake.  The other change I planned to make was a rear-exiting exhaust (mine blows straight down).  I understand that can make the biggest difference (not sure I believe the 10kts I've heard, but I'd take 5kts).
> 
> Geoff
> 
> On Wed, Mar 20, 2013 at 11:12 PM, Mark Magee <edjonesbrady at gmail.com> wrote:
>> All,
>> My XLFG was built with a NACA scoop where the bottom engine cowl marries to the fuselage for ram intake air. As I am nearing painting, and did not build this into the bird, the PO did, I'm considering eliminating the filtered lower NACA ram-air configuration for scat tubing to a cooling air NACA scoop topside for simplicity. As well the NACA down low where it is does catch considerable FOD from the nosewheel, yet is filtered.
>> I know some folks are running straight unfiltered from a scat tubing routing from an upper engine cooling NACA with no alternate air. Any feedback from the group on how well this is working? If I were to make this change I fear I might lose a slight loss of manifold pressure, but for the simplicity would be better off overall. The sealing on the airbox to the lower cowl is problematic.
>> Thanks in advance for the feedback. 
>> Mark Magee N34XL XLFG
>> 
>> <N34XL Lower NACA intake.JPG>
>> 
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