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kboatright1(at)comcast.ne
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 Posted: Sat Feb 16, 2008 8:34 pm Post subject: WOW - What a difference (Cooling/Plenums) |
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Just an opinion on the subject of plenums. If you are looking for the very
last ounce of speed, probably at the sacrifice of engine access, by all
means, install a plenum. For a given intake and outlet size, you should get
a few percentage points better cooling because you should have fewer air
leaks. But it'll be a single digit savings - probably low single digits. A
plenum isn't going to solve serious cooling problems. Those are usually
caused by something unique (or not quite right) with the airplane.
In my case, the oil temperatures were 220f in cruise on warm days for the
first year or so I flew my RV-6. In the end, the high temps boiled down to
two issues: I had the first generation Positech oil cooler, which was a bad
product. Bad enough that Positech eventually offered free replacements.
Also, I hadn't cut a large enough hole in my baffling to feed air to the oil
cooler. A plenum wouldn't have solved either of those issues.
There are boatloads of RV's out there with the stock baffling and cowl and
the vast majority of those airplanes cool well. The stock system is simple
to install (and if you use a plenum, Van's baffle kit will probably form
much of your plenum anyway), inexpensive, and effective. Unless you are one
of those individuals looking for that last 1-2% in speed or efficiency (at
the expense of time, money, and servicability), the stock baffles and
cowling work just fine.
As a side note, it was humid here in N. GA this morning. Humid enough that
I pulled prop contrails for the entire length of my takeoff roll and
probably another 3,000 feet down the runway on climb-out. It was kinda neat
seeing a swirling vortex wrapped around the airplane...
KB
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JohnInReno
Joined: 08 Sep 2007
Posts: 150
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| Posted: Sun Feb 17, 2008 2:44 pm Post subject: WOW - What a difference (Cooling/Plenums) |
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Pictures Please!
Kyle Boatright wrote:
| Quote: |
As a side note, it was humid here in N. GA this morning. Humid enough
that I pulled prop contrails for the entire length of my takeoff roll
and probably another 3,000 feet down the runway on climb-out. It was
kinda neat seeing a swirling vortex wrapped around the airplane...
KB
john
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http://www.matronics.com/Navigator?RV-List |
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_________________
John Morgensen
RV-9A - Born on July 3, 2013
RV4 - for sale |
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