REFLECTOR: ram air vs filter

[Terry Miles]

Keith,

Here's what I got...mostly this is a Malcolm Collier/Hangar 18 effort.   He
did the actual carving, and it was his idea.  I took it from there.   I can
send more pics if you need them.  It is the carved foam block routine.  Note
the scoop is away from the underside of the wing, and you can see the outlet
duct going into what would be the eng compartment.  We will use a short hunk
of hose to connect.  The wing root section fits the standard size
rectangular K&M filter and has the suction 2ndary door on a spring for
filter bypass.

The intake plenum that came with the engine didn't work.  Mine now goes off
to the right at about 35 degrees (to the left if you talk to Don George!)
He was good about swapping out the straight on one we had to begin with.
I've got the Ly 540.  I think there are 3 different induction
chambers/plenums whatever they are properly called.  They come on and off w/
a couple of bolts.   

Hope this inspires!  Good luck.  

Regards,
Terry


-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Keith Hallsten
Sent: Tuesday, June 12, 2007 9:05 PM
To: 'Velocity Aircraft Owners and Builders list'
Subject: Re: REFLECTOR: ram air vs filter

Rene',

This sounds like a pretty practical set-up for induction.  Do you have any
pictures?  Is the "midline scoop" available, or was that a one-off custom
part?

I am in the midst of engine installation, and the induction system seems to
be the part I'm having the most trouble with.  I have made a couple of air
boxes using the "lost foam" method, but found their design to be
unsatisfactory.  I'm definitely looking for inspiration on this.

Keith Hallsten
XLFG, Roseville, CA


-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Rene Dugas
Sent: Tuesday, June 12, 2007 4:22 PM
To: 'Velocity Aircraft Owners and Builders list'
Subject: Re: REFLECTOR: ram air vs filter

I use the midline scoop mounted to the lower cowl and the rear of the
fire wall.  I used a K & N cone shaped filter mounted to a 3 inch
aluminum flange with an identical flange mounted the opposite direction
in a fiberglass box.  This is attached to the induction by 3 in. scat
tubing to allow for vibration.  I mounted a spring operated door in the
side of the box for emergency air that sucks open if I close the scoop.
I made the box by forming foam and coating it with glass.  I used
acetone to dissolve the foam and presto custom air box.  I seem to get 1
to 2 inches of MP based on side by side flights with others at the
Velocity Symposium.
My scoop starts out about 1.75 by 2.25 inches and opens up into
approximately a one foot square air box with the K & N in it.
Just FYI.  I can remove the lower cowl and the scoop screws to the box.
I can remove the two screws in the scoop and remove the filter for
cleaning.
Rene'

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Tom
Sent: Thursday, June 07, 2007 8:01 PM
To: reflector at tvbf.org
Subject: REFLECTOR: ram air vs filter

My problem was that I went from ram air to what was too small of a 
filter. It was a 3" diameter x 5" long. I clamped it directly to the 
induction air tube. I really need a larger filter with filtration on the

end also (this was closed). Very space limited under there as I share 
the ram air inlet with a 2nd oil cooler mounted on the baffling. (large 
aeroduct hose). I may just go with a screen.
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