Joseph Berki wrote:

Paul,
        The drawing looks good, except that my radiator is farther forward.  It
starts at the leading edge of the spar under the spar.  The trailing edge
of the rad is about 3" from the front edge of the oil pan, this gives me
more room for the muffler augmenter.  This week end I managed to change the
rear mounts and now they are 90 degrees as you recommended.  I need more
tubing and it is on order and I also managed to increase the space between
the block and the tubes to 5"  and 4.5"  the tubes are also farther apart
vertically and  don't interfere with the exhaust pipes as much.  I will
send more pics when the pipes are cut.  I am thinking about testing the
scoop and measuring the delta P prior to mounting it in the airframe.  If I
could only get some wind tunnel time here at Glenn.  Thanks Paul  ( the
distance between the upper and lower hardpoints is 18" not 20" as mentioned
previously)

Joe Berki
LinoEZ

The spar being close to the back side of the rad will block the air flow.
You need a lot of volume behind any rad or the pressure will build up
there. The air velocity through the rad has been measured at 40% of
the forward velocity of the airplane and that flow will generate dynamic
pressure on any object it encounters on the back side of the rad.
This pressure will then tend to block the flow through the rad.
 
Can you move the augmentor back as shown? Also send me the distance from
the bottom of the spar to the bottom of the fuse and the dimensions
on the augmentor you are planning on using. Where NACA paper has the
best augmentor? Also the distance from the prop center line to the
bottom of the fuse.

Paul Lamar
 
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