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Drain holes & Carbon Monoxide

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dreel(at)cox.net
Guest

Posted: Fri Nov 10, 2006 7:27 pm Post subject: Drain holes & Carbon Monoxide

I just drilled a 1/8" hole just outboard of the fuselage in the lowest part

of

F826 and F827, the fuselage bottom skins that are attached  the inboard

bottom wing skin.  Their purpose is to drain water that collects there when

the RV8A sits outside

in the rain.  I keep it outside on tie down all the time.  It just occured

to me that I may have provided a path for exhaust products to be sucked into

the cockpit.  Could you comment on the likelyhood of this possibility?  The

holes are located 23 inches forward from the trailing edge of the flap when

it is fully raised.



Come to think of it, why don't exhaust products get sucked into the cockpit

through the aileron pushrod and flap pushrod holes?  Is it the draftyness of

our cockpits that saves us?



Dave Reel - RV8A

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Mark Phillips in TN

Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN

Posted: Fri Nov 10, 2006 7:41 pm Post subject: Drain holes & Carbon Monoxide

Hi Dave-

  

 FWIW, if the drain holes are at the outside edges of the fuse where the in-flight air pressures are largely affected by the wing airfoil, they may actually be drawing air OUT of the fuselage- see this airfoil diagram:

  

 http://websites.expercraft.com/n51pw/index.php?q=log_entry&log_id=5255

  

 This is largely speculative on my part and may or may not apply in your case as the pressures may be different at your actual location- you could always test for CO with a tester in the cabin to be sure- cheap peace-of-mind dontchaknow...

  

 Mark

  [quote][b]

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_________________
From The PossumWorks...

rmkeith(at)gwi.net
Guest

Posted: Sat Nov 11, 2006 4:56 am Post subject: Drain holes & Carbon Monoxide

You could install a drain hole cover like tie ones found on fabric covered 

float planes. The cover should produce a vacuum when the AC is in motion.



Russ Keith

RV9A

---

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Gary.A.Sobek

Joined: 09 Jan 2006
Posts: 217
Location: SoCAL USA

Posted: Sat Nov 11, 2006 5:13 am Post subject: Drain holes & Carbon Monoxide

Ask anyone that has a SMOKE system how much smoke gets in the cockpit if you 

pull Gs and have the air vents closed.



There is a lot of leakage IN to the cockpit of an RV-6.  Close all the 

vents, pull 2 or more Gs, and the cockpit will fill with smoke.  In straight 

and level, you also will get smoke in the cockpit IF all the vents are 

closed but it takes a lot longer and there is a LOT less. With all the vents 

open, there is no problem.



I know, more POLUTION.  Smoke oil is nothing but Concrete form release oil. 

The EPA recommendation on disposal is VAPORIZATION.  That is what people 

with smoke systems are going and it is the best test there is to find out 

how much carbon monoxide is getting into your airplane.



The amount of smoke that gets in without any drain holes is large compaired 

to what you will get in through the addition of drain holes.



Please do not ask me how I know this.



Gary A. Sobek

"My Sanity" RV-6 N157GS O-320 Hartzell,

1,964 + Flying Hours So. CA, USA



----Original Message Follows----

From: "DAVID REEL" <dreel(at)cox.net>

Reply-To: rv-list(at)matronics.com

To: "rvlist" <rv-list(at)matronics.com>

Subject: Drain holes & Carbon Monoxide

Date: Fri, 10 Nov 2006 22:28:31 -0500






I just drilled a 1/8" hole just outboard of the fuselage in the lowest part

of

F826 and F827, the fuselage bottom skins that are attached  the inboard

bottom wing skin.  Their purpose is to drain water that collects there when

the RV8A sits outside

in the rain.  I keep it outside on tie down all the time.  It just occured

to me that I may have provided a path for exhaust products to be sucked into

the cockpit.  Could you comment on the likelyhood of this possibility?  The

holes are located 23 inches forward from the trailing edge of the flap when

it is fully raised.



Come to think of it, why don't exhaust products get sucked into the cockpit

through the aileron pushrod and flap pushrod holes?  Is it the draftyness of

our cockpits that saves us?



Dave Reel - RV8A





_________________________________________________________________

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FLYaDIVE(at)aol.com
Guest

Posted: Sat Nov 11, 2006 5:19 am Post subject: Drain holes & Carbon Monoxide

In a message dated 11/11/2006 7:58:18 AM Eastern Standard Time, rmkeith(at)gwi.net writes:

  	  Quote: 	
		  You could install a drain hole cover like tie ones found on fabric covered 

float planes. The cover should produce a vacuum when the AC is in motion.



Russ Keith

RV9A 	


 ============================

 Guys:

  

 There are SCUPPER vents that can be purchased at your local chandlery (Ship's Store) that are easy to mount.  BUT!  They don't work either.  I spent two years hunting down CO leaks in an RV-6.  And the cure was to install automotive curved exhaust extensions.  The cost was about $10 each which includes the hardware clamps.  The results are ZERO (0) CO showing up on the monitor.  I tried everything ... you name it ... I'd bet I tried it.

  

 Barry

"Chop'd Liver"

  [quote][b]

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wdleonard(at)gmail.com
Guest

Posted: Sat Nov 11, 2006 8:02 am Post subject: Drain holes & Carbon Monoxide

On 11/10/06, DAVID REEL <dreel(at)cox.net (dreel(at)cox.net)> wrote:  	  Quote: 	
		  --> RV-List message posted by: "DAVID REEL" <dreel(at)cox.net (dreel(at)cox.net) >



I just drilled a 1/8" hole just outboard of the fuselage in the lowest part

of

F826 and F827, the fuselage bottom skins that are attached  the inboard

bottom wing skin.  Their purpose is to drain water that collects there when 

the RV8A sits outside

in the rain.  I keep it outside on tie down all the time.  It just occured

to me that I may have provided a path for exhaust products to be sucked into

the cockpit.  Could you comment on the likelyhood of this possibility?  The 

holes are located 23 inches forward from the trailing edge of the flap when

it is fully raised.



Come to think of it, why don't exhaust products get sucked into the cockpit

through the aileron pushrod and flap pushrod holes?  Is it the draftyness of 

our cockpits that saves us?



Dave Reel - RV8A

	


 

Dave, I get a wiff of exhaust when I deploy my flaps.  It does appear to come through the flap actuator holes.  My problem is worse than others because 1) my exhaust is farther forward and displaced to the port side.  And 2) I moved my flap actuator over to the port side of the baggage area which required a hole in the port flap weldiment inspection cover. (there are a couple pictures on my website if you want to see) 

  

 I fixed most of the problem by sealing up the leaks around that inspection cover.  The CO was never bad enough to change the color of the chemical sensor, but I'm sure the electronic versions would tell a different story. 

  

 In general, there seems to be enough cabin ventilation that the effects are not significant.

-- 

David Leonard



Turbo Rotary RV-6 N4VY

My websites at:

 http://members.aol.com/_ht_a/vp4skydoc/index.html

 

  [quote][b]

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