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1. 11:15 PM - Re: O2 in air tank?????? (Yak Pilot)
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| Subject: | Re: O2 in air tank?????? |
This topic sure comes up a lot. -) I too have started an engine with the cylinder
completely full of nitrogen. Others have tried it and have sworn on all
that is holy that it just will not work. Possibly a variation in the starting
air distributor setting.
Bottom line though is that air is being ported into a cylinder that is on the
firing stroke. Other pistons not being forced downward with the compressed gas
are on the intake stroke and are pulling in the standard air/fuel mixture.
Regardless, during long periods of inactivity I have filled my tanks with water
pumped nitrogen and have later started the engine. I admit it did not fire
as quickly as it normally does, but it did start.... more than once.
Now lets talk about flight suits and parachutes.
Mark Bitterlich
N50YK
Wesley Warner <warner.wesley@gmail.com> wrote:
I have started an M14P more than once with nitrogen. It worked just fine.
Wes
On 4/1/07, Steve Culp wrote:
> Hi:
>
> Welding companies have to by law have the contents of bottles marked and
> the fittings are different. I was kinda suprised that someone would change
> the fittings around to make this happen.
>
> I would think he is very lucky no one was injured.
>
> If the cylinder looks strange and does not have a label identifying the
> contents I would not use it.
>
> One of the most common mistakes is for people to use Nitrogen to try to
> start the engine. Of course the engine won't start on an inert gas. But
> they should get good oil pressure.
>
> If in doubt hand prop the engine. M-14s prop pretty easy with two
> people. One in the plane and one on the ground. If you are completely out
> of air and the plane has air brakes tie the plane down to something
> substantial.
>
> I have propped a few planes by myself and you have to be real careful.
> Probably a bad idea but sometimes you don't have a choice. I have installed
> tow hooks on a couple of planes so the owners could carry some small pieces
> of cable and just leave the cable behind after they started their planes.
>
> Steve Culp
>
> Scott Aldrich wrote:
>
> I've spoken with the owner of the Moose mentioned below. Just to add a few
> notes.
>
> The air bottle is the new modern aluminum cylinder type and it is way in the
> tail of his Moose - with it being so new and so far from the source of oily
> air from the compressor it is pretty clean inside - that is why no problem
> when the O2 initially pumped in.
>
> Also all the damage was from the O2 exploding not any "back pressure" caused
> by the backfire. Actually he is thinking no real back fire and the big
> violent bang he heard was of course the manifold and everything blowing up.
> To add to the damage mentioned below he has a stainless braided flex line
> from the solenoids on the fire wall to the bottle in the tail - the
> stainless braid was blown out all along this line too.
>
> Of course he was assured multiply times that the bottle was "air" not O2.
>
> How would one test to see if an unknown source was air or O2 in a situation
> like this?
>
> FWIW
> Scott
>
> -----Original Message-----
> From: owner-m14pengines-list-server@matronics.com
> [mailto:owner-m14pengines-list-server@matronics.com] On Behalf Of N395V
> Sent: Thursday, March 29, 2007 11:54 AM
> To: m14pengines-list@matronics.com
> Subject: M14PEngines-List: O2 in air tank??????
>
>
> Just got the following e mail from a friend.
>
>
> > Just a word of caution-----perhaps something you already know, perhaps
> not.
> >
> > A friend with Murphy Moose that has the same engine you have in the
> Gryphon, just had a strange and costly mishap -----
> >
> > He ran the air tank down trying to start a flooded engine. Apparently,
> when the tank was recharged, someone put oxygen in. This happened at another
> airport, not his home, and he was not aware of the problem.When he started
> the engine, it backfired violently, but started.
> >
> > Not being aware that there was anything wrong, he flew home. The next time
> he tried to start, no air pressure.
> >
> > Seems that when it backfired, the pressure was so extream that it blew a
> 3000# line at the engine, as well as another fitting on a hard line, and
> lastly, blew the air start distributor apx 3" off the engine.
> >
> > Bent the lines to the cylinders, and stripped the studs out of the adapter
> that the air distributor sits on.
> >
> > Moral of this story, if you need an air fill, be sure that it is air, or
> nitrogen, not oxygen.
> >
>
>
> Are the O2 transfill adapters compatible with the fill connector on the air
> tanks?
>
> --------
> Milt
> 2003 F1 Rocket
> 2006 Radial Rocket
> Some people live an entire lifetime and wonder if they have made a
> difference to the world, but the Marines dont have that problem. -
> Ronald Reagan
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=103699#103699
>
>
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