REFLECTOR:NACA inlet shape

[Ronnie Brown]

My NACAs are working well - or actually, my engine heads are running cool
IO360 - 350-360 deg F in cruise and leaned, the max head temp I have seen
this summer is 380 after a 5000' climb.  My oil temps are running 210 in
cruise and 220 during climb during this hot weather.

I am really pleased with how well my systems are working.  Still throwing
out a bit more oil than I'd like to see - 1 quart in 5-6 hours. I didn't run
it hard enough/or still had some STP in it protecting the cam for initial
start after laying up for a couple of years after the test stand at Don
George's.

But I'm still running mineral oil at 80 hours.  I am planning to change to
15-50 in the next week or so.

And the Garmin 430 and Navaid worked wonderfully during my trip to Oshkosh
and back and then down to Hilton Head this past weekend.  I flew about an
hour in the clouds and did two localizer approaches in the clouds.
Terrific!!!

Ronnie




----- Original Message -----
From: "Pat Shea" <xl340hp@yahoo.com>
To: <reflector@tvbf.org>
Sent: Wednesday, August 06, 2003 4:45 PM
Subject: Re: REFLECTOR:NACA inlet shape


| Jerry,
|
|  If you don't have the top naca inlets pre-molded into
| your fuselage, the factory sells a kit w/ templates
| and instructions to do just what you are proposing. Be
| sure to get the kit for you engine (they used to offer
| two different sizes). They also sell runners that fit
| these nacas.
|  The aspect ratio of the opening is not optimal, but
| rather a reasonable compromise for our application.
| Unlike the ramp angle (which is good), the aspect
| ratio is not as critical for good naca efficiency. The
| factory's nacas are working well in the field.
|  It's the "nacas" up front (oil/vent) that don't
| really work as such. Basically, they are "ram air
| scoops" disguised as "nacas".
|
| Pat
|
| --- Jerry.Brainard@anthem.com wrote:
| > The kit that I have does not have the pre-molded
| > NACA inlets for engine
| > cooling.  While I could purchase them from the
| > factory, it seems that it
| > should be easy to make them by cutting the fuselage
| > and use that to make
| > the inlet.  I think someone mentioned that the
| > factory shape may not be
| > quite right.  I thought someone had a drawing or the
| > NACA source
| > information on the shape and proportions.  If
| > possible, I would like to get
| > the details so that I can make my own.
| >
| > Jerry
| >
| >
| >
| >
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