REFLECTOR:INTAKE COMBUSTION AIR

[Chuck Jensen]

Scott,

Leave Ronnie alone.  He's got so many do-dads and fun things in his cockpit
to play with that he can't be messing around with stuff like LOP ops.  

I hopped over the mountains from Knoxville, TN to Ronnie's strip to take a
look at his plane yesterday.  In beautiful, clear early fall whether, the
mountains (7,000') between here and there didn't seem quite to tall as when
you look at them through mid-summer soup. 

A half-dozen times I had to quiz Ronnie, "what the heck does that do?"
Turns out that Ronnie has so many neat and unique things installed that the
Velo can go flying even if he's not available!

In all seriousness, Ronnie's plane is fun and interesting and is worth
seeing is how he "treated" all the little things that pop up from time to
time.  Some people take ideas, some give ideas, Ronnie does both.

Chuck Jensen

-----Original Message-----
From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On
Behalf Of Scott
Sent: Sunday, September 14, 2003 8:30 AM
To: reflector@tvbf.org
Subject: Re: REFLECTOR:INTAKE COMBUSTION AIR


Ronnie,

We gotta get you dialed into LOP operations....  Less gas, cooler running,
longer lasting.

Scott


On Sun, 14 Sep 2003 09:10:38 -0400, Ronnie Brown wrote:
> We asked Duane about the open baffling on the cooling shrouds on
> the factory XL Continental (shrouds don't wrap under the bottoms of
> the cylinders).  He said the angle valve Lycoming and Continentals
> with their larger cooling fins don't need the tight shrouds. 
>
> However, I did wrap the cylinders all the way to the bottom of my
> IO 360 C1C - 200HP and only have about a 1.5 to 2" opening at the
> bottom of my cylinders.  My engine runs cool with the NACA down
> draft cooling - 350 - 360 degrees while leaned out to 100 degrees
> rich of peak.  I have never seen 400 degrees on my heads, even on
> 90 degree days and during a long climb out.  Even taxiing at
> Oshkosh only produced 300-320 degrees. 
>
> And, I am only running one oil cooler.  My A&P/IA friend says one
> cooler and those long oil lines should be plenty of oil cooling IF
> the engine is cooled adequately.  After 85 hours of mostly summer
> flying, I agree.
>
> I worried a lot about a hot running rear mounted engine while I was
> building and watched the reflector and VV's for any information for
> improving cooling.  Now I am happy to say, this has been a non
> issue for my Velocity.  I LOVE IT!!!
>
> Ronnie
>
>
> ----- Original Message -----
> From:  SlvEgl99@aol.com
> To: reflector@tvbf.org
> Sent: Sunday, September 14, 2003 8:18  AM
> Subject: Re: REFLECTOR:INTAKE COMBUSTION  AIR
>
>
> I have an XL FG with Lycoming IO540, two oil  coolers.
>
>
> I have always had a bit of a cooling issue. Not so much that  temps
> are high, but that they are uneven between cylinders. The center
> two  (3&4) are significantly cooler than the end four. Thisa is
> sometimes 70  degrees or more.
>
>
> After a lot of time trying to get diverters in the  ducting to move
> a greater amount of air to the ends of the plenum, I took a  hard
> look at how Lycoming has the air flow controlled between the
> cylinders  and noted that they have baffles between the cylinders
> that force the cooling  air to stay within the cylinder fins nearly
> to the bottom of the cylinder. On  the other hand, the XL plenum
> stops half way down the front and rear  cylinders, allowing the air
> to "escape" from the cylinder fins at this  point.
>
>
> I also took a look at a a long EZ and how that engine is  baffled.
> I saw that the baffling has the air confined to the cylinders with
> just a small (2.5") opening for the air to exit the fins.
>
>
> By  coincidence just this week I decided to extend the ends of the
> plenum to near  the bottom of the cylinders, cutting them off at
> the approximate length of the  Lycoming  baffles.
>
>
> How does it work? I don't know yet as I have  just completed the
> job and have not had a chance to fly it yet.
>
>
> The  other heat issue I have is that the front oil cooler puts too
> much heat into  the nose., and then into the cockpit. I have a
> piece of foam above the canard  inside the hatch cover to block the
> heat from the nose and insulated it as  well as I can by adding
> insulation around the body of the cooler and  insulating the oil
> lines. I point out that I have a FG, thus no nose gear door  to
> allow air into the nose. I have toyed with the idea of adding a
> small vent  to bring in cool air to this area.
>
>
> Any thoughts or ideas or  concerns?
>
>
> Bob Wood
> N658SE
> XL FG Bob II



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