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RV-List Digest: 25 Msgs - 10/04/06

 
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dean.psiropoulos(at)veriz
Guest
PostPosted: Thu Oct 05, 2006 8:49 pm    Post subject: RV-List Digest: 25 Msgs - 10/04/06 Reply with quote
Linn this comment sounds a lot like some of the other urban legends that I
keep hearing since being involved in aviation. I honestly cannot understand
where this one came from. This is another thing that does have a
counterpart in automotive land. As far back as I can remember (about 1963)
automobiles have been turned off with the IGNITION switch, NOT a fuel
cutoff. Now I don't know why airplanes have to use that particular method
over just turning off the ignition but it in some ways it seems as
antiquated as the magnetos that are STILL in use on new production airplanes
today. Why do we continue to perpetuate this stuff when cars have long
since dispensed with them? We NEVER think about washing oil off the cylinder
walls of our autos, even when they had big four barrel carburetors? Not a
personal attack on you Linn, just a frustration with certain things I hear
in aviation land that are NEVER even thought about in automotive land.

Dean Psiropoulos
RV-6A N197DM
Finishing wiring, soon to clear the prop.


----------------------------------------------------------------------------
Quote:
Time: 01:28:36 PM PST US
From: linn Walters <pitts_pilot(at)bellsouth.net>
Subject: Re: Findings on the AFP purge valve

Quote:
The only downside to this procedure is that there is 'extra' fuel in the
cylinders which will wash the oil off the cylinder walls.
Linn


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pitts_pilot(at)bellsouth.
Guest
PostPosted: Thu Oct 05, 2006 9:36 pm    Post subject: RV-List Digest: 25 Msgs - 10/04/06 Reply with quote
Dean, I share your frustration. Thanks to the Feds, we have to put up with antiquated engines because it costs too much to certify new ones, and the lawyers have inferred that if an improvement is made, then the original was flawed. Homebuilts are the only solution. Car engines have all the newest technology ... are far more efficient, have better power to weight ratios, and far better tolerances. I really have to agree .... magneto's belong on lawnmowers!!! However, they're dirt simple and if taken care of .... hardly ever fail. I like that. Electronic ignition is more efficient ..... but is still prone to failures like any other electronic gadget. I don't really like that. Working in the electronics industry all my life has made me very wary!!! KISS is important to me, and adding dual backut everythings just doesn't give me a warm fuzzy feeling. But I digress.

I believe the biggest difference between car engines and airplane engines is the way we operate them. The only way your car sits in the garage for weeks on end is when your job takes you out of town!!! I run the dog-crap out of my Pitts engine ..... and often .....so I don't worry about internal rust and corrosion because I run it often. If you flew every day, then you'd probably never have any problems related to shutting the engine down with the mag switch. I was given that reason for having an idle cutoff on the mixture and accepted it. It's plausible to me. So, I ask you ..... do you have a better reason?? Lycoming says a lot of things relating to their engines that I think come from a severe case of CYA. This could be one of them. Until I find good. meaningful data to suggest otherwise, I'll hold on to this "urban legend".
Linn
do not archive.
DEAN PSIROPOULOS wrote:
[quote]
Quote:
--> RV-List message posted by: "DEAN PSIROPOULOS" <dean.psiropoulos(at)verizon.net> (dean.psiropoulos(at)verizon.net)

Linn this comment sounds a lot like some of the other urban legends that I
keep hearing since being involved in aviation. I honestly cannot understand
where this one came from. This is another thing that does have a
counterpart in automotive land. As far back as I can remember (about 1963)
automobiles have been turned off with the IGNITION switch, NOT a fuel
cutoff. Now I don't know why airplanes have to use that particular method
over just turning off the ignition but it in some ways it seems as
antiquated as the magnetos that are STILL in use on new production airplanes
today. Why do we continue to perpetuate this stuff when cars have long
since dispensed with them? We NEVER think about washing oil off the cylinder
walls of our autos, even when they had big four barrel carburetors? Not a
personal attack on you Linn, just a frustration with certain things I hear
in aviation land that are NEVER even thought about in automotive land.

Dean Psiropoulos
RV-6A N197DM
Finishing wiring, soon to clear the prop.


----------------------------------------------------------------------------
Quote:
Time: 01:28:36 PM PST US
From: linn Walters <pitts_pilot(at)bellsouth.net> (pitts_pilot(at)bellsouth.net)
Subject: Re: Findings on the AFP purge valve

Quote:
The only downside to this procedure is that there is 'extra' fuel in the
cylinders which will wash the oil off the cylinder walls.
Linn


[b]

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dbris200(at)sbcglobal.net
Guest
PostPosted: Fri Oct 06, 2006 7:45 am    Post subject: RV-List Digest: 25 Msgs - 10/04/06 Reply with quote
The best reason for shutting down your aircraft engine with the mixture instead of the switch is safety. You don't have a propeller on your car so it doesn't matter if there's a cylinder ready to fire, but on an airplane with a charge in a cylinder, if the prop gets moved and a mag is hot, the engine can start. So if you shut it down by pulling the mixture (or using the bypass valve) there is much less of a chance that it will fire inadvertently and hurt someone.

Dave -6 So Cal
EAA Technical Counselor


DEAN PSIROPOULOS wrote: [quote]
Quote:
--> RV-List message posted by: "DEAN PSIROPOULOS" <dean.psiropoulos(at)verizon.net> (dean.psiropoulos(at)verizon.net)

Linn this comment sounds a lot like some of the other urban legends that I
keep hearing since being involved in aviation. I honestly cannot understand
where this one came from. This is another thing that does have a
counterpart in automotive land. As far back as I can remember (about 1963)
automobiles have been turned off with the IGNITION switch, NOT a fuel
cutoff. Now I don't know why airplanes have to use that particular method
over just turning off the ignition but it in some ways it seems as
antiquated as the magnetos that are STILL in use on new production airplanes
today. Why do we continue to perpetuate this stuff when cars have long
since dispensed with them? We NEVER think about washing oil off the cylinder
walls of our autos, even when they had big four barrel carburetors? Not a
personal attack on you Linn, just a frustration with certain things I hear
in aviation land that are NEVER even thought about in automotive land.

Dean Psiropoulos
RV-6A N197DM
Finishing wiring, soon to clear the prop.


----------------------------------------------------------------------------
Quote:
Time: 01:28:36 PM PST US
From: linn Walters <pitts_pilot(at)bellsouth.net> (pitts_pilot(at)bellsouth.net)
Subject: Re: Findings on the AFP purge valve

Quote:
The only downside to this procedure is that there is 'extra' fuel in the
cylinders which will wash the oil off the cylinder walls.
Linn


[b]

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jfogarty(at)tds.net
Guest
PostPosted: Fri Oct 06, 2006 12:21 pm    Post subject: RV-List Digest: 25 Msgs - 10/04/06 Reply with quote
Dave, That is excellent advise. I'm sure we have all read this somewhere or heard this from our CFI, but thanks for telling all of us again.

Jim
RV9a
[quote] ---

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