REFLECTOR: XLFG Intake Air
Kevin Baker
flykb at verizon.net
Thu Mar 21 14:58:51 CDT 2013
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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