REFLECTOR:Crankcase breather hose pop off

[Ronnie Brown]

Well, that is why I (and Cessna) make a whistle hole out of it.  Just drill
Scott's hole, then take a smaller drill bit (or longer round rod) turned
around backwards, and bend the upper part of the hole inwards so that the
oil vapors passing by will create higher velocity/lower pressure area that
sucks air in rather than lets oil vapor out (unless of course the pipe
sticking out of the cowl is iced over).

As Mark Machado used to say, it doesn't have to be perfect, just precise!
These little details can make a difference - as long as you don't get so
focused on the details that you forget to finish the plane.

Ronnie


----- Original Message -----
From: "Paul Calhoun" <paul@med-amb.org>
To: <reflector@tvbf.org>
Sent: Thursday, June 12, 2003 2:02 PM
Subject: RE: REFLECTOR:Crankcase breather hose pop off


> Good point Scott. I have a way of straining gnats and swallowing camels.
> Wisdom in the building process is choosing which battles you're going to
> fight.
>
> Question: Where is the hole you drilled, how big was it and doesn't it
> blow out oil vapor into your compartment?
>
> Paul
>
> -----Original Message-----
> From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org] On
> Behalf Of Scott Derrick
> Sent: Wednesday, June 11, 2003 4:52 PM
> To: reflector@tvbf.org
> Subject: Re: REFLECTOR:Crankcase breather hose pop off
>
>
> You guys are way to high tech for me.  I just drilled a simple circular
> hole in mine!
>
> Scott
>
> Ronnie Brown wrote:
> > That's correct.  The whistle cut should be inside the engine
> > compartment.  Mine is about 6 inches from the bottom of the cowling.
> I
> > don't think there would be an icing problem there.  And if there is,
> I'm
> > landing, right now!!!  cause it is WAY too cold outside. (;<)))
> >
> > The angle cut at the bottom of the cowl/fuselage (mine is 1/2"
> > aluminum
> > tube) sticks out about an inch or a bit more.
> >
> >
> > ----- Original Message -----
> > From: Paul Calhoun <mailto:paul@med-amb.org>
> > To: reflector@tvbf.org <mailto:reflector@tvbf.org>
> > Sent: Wednesday, June 11, 2003 6:03 PM
> > Subject: RE: REFLECTOR:Crankcase breather hose pop off
> >
> > Ronnie,
> > Thanks for your response. <cut on the piece that sticks out the
> > bottom>  - Bottom of the cowling? Shouldn't the whistle slot be near
> > the opening of the crankcase so the potential ice blockage would be
> down
> > line?
> >
> > The angle cut is a good idea. Some have wrapped a spring around the
> > middle of the slot also.
> > Paul
> >
> >     -----Original Message-----
> >     From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]
> On
> >     Behalf Of Ronnie Brown
> >     Sent: Tuesday, June 10, 2003 7:00 PM
> >     To: reflector@tvbf.org
> >     Subject: Re: REFLECTOR:Crankcase breather hose pop off
> >
> >     I used the whistle slot and it works fine, IF you have a good
> >     rearward cut on the piece that sticks out the bottom.  I tried
> >     cutting it more in line with the fuselage bottom, and that caused
> >     oil to blow onto the firewall through the whistle slot.  I recut
> it
> >     with more angle and it is working fine without getting oil on the
> >     firewall.
> >
> >     Ronnie
> >
> >     ----- Original Message -----
> >     From: Paul Calhoun <mailto:Paul@med-amb.org>
> >     To: reflector@tvbf.org <mailto:reflector@tvbf.org>
> >     Sent: Tuesday, June 10, 2003 8:07 PM
> >     Subject: REFLECTOR:Crankcase breather hose pop off
> >
> >     Because of the possibility of the crankcase breather hose freezing
> >     up, reflectorites have suggested slitting the top side of the hose
> >     near the crankcase outlet for pressure relief in such an event.
> This
> >     avoids blowing out the crankcase seal with a blocked hose.
> >
> >     Has anyone considered/used a pop off valve in the hose instead of
> a
> >     slit? Seems like this would give a more reliable, controlled
> escape.
> >     If so,where would one get such a valve?
> >
> >     Paul Calhoun
> >
> >     Medical Ambassadors International
> >     Transforming nations through the seamless combination of disease
> >     prevention, evangelism, and community development.
> >
> >
>
>
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