Paul wrote:

Well, Paul Lamar was correct.  A while back when I was trying to get more
rpm's from my 13b, Paul suggested that if I could get some cold ram air
into it, it would make a big difference.

     I was aware that It would make some difference, just didn't realize
how much. I had always ran my engine with both top and bottom cowlings
on. Finally got the rpm's up to 5100 static.  Last
week, after finally fixing my vapor lock issue, I ran the engine with the
top cowling off for the first time.  5600 static rpm's.  Put the top
cowling back on...5100 rpm's.

Most likely a

combination of restricted airflow as well as ingesting heated air.
      I just finished making a ram air scoop which will both allow the
engine to ingest outside air while on the ground, and have the benefit of
ram air when in flight. Hopefully I will be able to
report improved performance numbers soon.  Paul Conner, 13b powered
SQ2000 in Mobile, AL

You sound surprised :)

What will she do now Paul, before the ram air scoop?
Got any pictures of the new scoop?

Paul Lamar
cut

 Hi, Paul....Not surprised that there was an increase in rpm's ....just
surprised at the magnitude. 500 static rpm's is a significant difference!
Don't know how many more I may get in flight with the ram air effect.
      I need to take some pictures of the completed scoop. I do, however
have a few of the scoop during construction.  The scoop is located in the
same place as the factory cowling scoop (for downdraft cooling on a
Lycoming), but located to best direct the air both into the intake as well
as hit the fuel rails and exhaust manifold. It looks rather ugly in these
pics, but the finished product is faired in and looks better.
       Haven't flown it yet, (rain today) but I can't imagine not realizing
an improvement in climb/cruise speeds. Also attached is a picture of the
factory downdraft scoop.  Paul Conner

It is going to looks great Paul.

Paul Lamar


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