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n1cxo320(at)salidaco.com
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 Posted: Sat Jun 14, 2008 6:14 pm Post subject: It works better, but I don't know why |
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My RV6A always had a habit of showing a few "dribbles" of red brake fluid streaming out on the bottom of the fuselage beginning at the firewall and running back on the belly about like oil might.
It never was much but was always there, yet the quantity was so small that I really couldn't see the brake reservoir being depleted or being drained of any significant amount.
Here's the oddity: I always knew there was air pressure in the bottom of the cowling because my first flight had the oil inspection door bulging. In an attempt to increase air speed by reducing cooling drag I installed two louvers (from Avery's) along the bottom of the cowling...they're about 11-inches by 3.5 or so - rough estimates - that I hoped would reduce the built-up pressure, get more air moving across the cylinder heads and give me an extra knot or two. I didn't see much difference in speed.
But the red traces of brake fluid are gone. Somehow the built up pressure was sucking some fluid from the reservoir I suspect although there never was any indication of red brake fluid anyplace except along the bottom of the fuselage just aft of the firewall.
I'll settle for a solved problem even if I don't understand it.
Chew on it folks and see what ideas you have.
John
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rv8a2001(at)yahoo.com
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| Posted: Sat Jun 14, 2008 7:34 pm Post subject: It works better, but I don't know why |
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I have NO brake fluid leaks anywhere but still ran the right brake reservoir dry.........figure that one out!
Scott Bilinski
RV-8a
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Gary.A.Sobek
Joined: 09 Jan 2006
Posts: 217
Location: SoCAL USA
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| Posted: Sat Jun 14, 2008 8:21 pm Post subject: It works better, but I don't know why |
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On my -6, if you fill the reservoir over 1/2 to 2/3 full, I get fluid out the breather, down the firewall, and on the belly. It settles out and does not come out the breather once it is at the 1/2 or less level. (Unless you go negative G for more than a second.) Anyway, that is my experience after 10+ years of flying the -6.
Gary A. Sobek
"My Sanity" RV-6 N157GS O-320 Hartzell,
2,113 + Flying Hours So. CA, USA
| Quote: | From: n1cxo320(at)salidaco.com
To: rv-list(at)matronics.com
Subject: It works better, but I don't know why
Date: Sat, 14 Jun 2008 20:11:16 -0600
My RV6A always had a habit of showing a few "dribbles" of red brake fluid streaming out on the bottom of the fuselage beginning at the firewall and running back on the belly about like oil might.
It never was much but was always there, yet the quantity was so small that I really couldn't see the brake reservoir being depleted or being drained of any significant amount.
Here's the oddity: I always knew there was air pressure in the bottom of the cowling because my first flight had the oil inspection door bulging. In an attempt to increase air speed by reducing cooling drag I installed two louvers (from Avery's) along the bottom of the cowling...they're about 11-inches by 3.5 or so - rough estimates - that I hoped would reduce the built-up pressure, get more air moving across the cylinder heads and give me an extra knot or two. I didn't see much difference in speed.
But the red traces of brake fluid are gone. Somehow the built up pressure was sucking some fluid from the reservoir I suspect although there never was any indication of red brake fluid anyplace except along the bottom of the fuselage just aft of the firewall.
I'll settle for a solved problem even if I don't understand it.
Chew on it folks and see what ideas you have.
John
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sportav8r(at)gmail.com
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| Posted: Sun Jun 15, 2008 4:13 am Post subject: It works better, but I don't know why |
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Thieves!
-Stormy (no fluid level change in 10 years)
On Sat, Jun 14, 2008 at 11:26 PM, scott bilinski <rv8a2001(at)yahoo.com (rv8a2001(at)yahoo.com)> wrote:
[quote] I have NO brake fluid leaks anywhere but still ran the right brake reservoir dry.........figure that one out!
Scott Bilinski
RV-8a
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kboatright1(at)comcast.ne
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| Posted: Sun Jun 15, 2008 4:39 am Post subject: It works better, but I don't know why |
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Is there any chance that you had air bubbles in the low pressure side of your brake system? As the aircraft's altitude increases, the air bubbles would expand, and could cause the resivour to overflow as fluid in the lines was pushed back into the holding tank...
KB
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