Glenn,
>I don't understand Williams thought that the filler neck
> vent might be acting as a pitot tube as I have a flush fitting fuel cap.
I was referring to the forward facing vent you have behind the flap drive
(that, presumably, is connected to the filler neck) but if you have drilled
the little holes, then it cannot pressurise the tank with pitot pressure.
Regards,
William
----- Original Message -----
From: "GLENN CROWDER" <gcrowder2@hotmail.com>
Sent: Monday, October 02, 2006 5:18 AM
Subject: Re: Europa-List: Monowheel sight gauge
>
> I will try William's idea of running the sight gage tube all the way up
> to the top of
> the filler neck. I really don't see why that would make any difference
> but its worth a try!
> I have the little holes drilled in back of the vent inlets. I thought
> that would fix my
> problem but no change. I don't understand Williams thought that the
> filler neck
> vent might be acting as a pitot tube as I have a flush fitting fuel cap.
> I have no vent
> directly on the filler tube that I know of. Thanks, William!
>
> Glenn
>
>>From: "William Mills" <william@wrmills.plus.com>
>>Reply-To: europa-list@matronics.com
>>To: <europa-list@matronics.com>
>>Subject: Re: Europa-List: Monowheel sight gauge
>>Date: Sun, 1 Oct 2006 06:41:02 +0100
>>
>><william@wrmills.plus.com>
>>
>>Jos and Glenn,
>>I have had the sight tube between the seats of my mono for about 800 hours
>>of flying now and it is totally reliable as a backup for the fuel computer
>>if certain measures are taken to keep the horizontal section of tube free
>>from slugs of fuel.
>>I keep the sight tube vent separate right up to the filler neck so it is
>>not influenced by anything else. (Glenn, the fuel return line could
>>bubble vapour into the gauge and push fuel into the horizontal section,
>>also is the filler neck vent acting as a pitot and pressurising the tube
>>when flying? Have you forgotten to drill the little hole facing aft?)
>>I also have an on / off valve in the sight gauge tube where it tees into
>>the port side water drain at the tank entry point. This is necessary to
>>stop fuel from being pushed up the tube into the horizontal section when
>>filling the tank, because without it the sight tube acts as a another vent
>>to the tank when being filled. The gauge must of course be calibrated
>>with the port door sill horizontal so when the tail is on the ground it
>>shows less fuel than actual. If a slug of fuel gets trapped in the
>>horizontal section it will distort the gauge fuel level, because the air
>>trapped above the fuel level is unlikely to be at atmospheric pressure.
>>Hope that helps.
>>William
>>
>>----- Original Message ----- From: "GLENN CROWDER" <gcrowder2@hotmail.com>
>>To: <europa-list@matronics.com>
>>Sent: Saturday, September 30, 2006 5:20 PM
>>Subject: Re: Europa-List: Monowheel sight gauge
>>
>>
>>><gcrowder2@hotmail.com>
>>>
>>> I have routed my sight gauge identically and it works great on the
>>> ground, but
>>>in the air the fuel goes down in the sight gauge by about 3-4 gal. If I
>>>route the
>>>vent into my fuel return line at the top of the tank instead of the fuel
>>>tank breather
>>>tube, I get the same results so the sight guage is pretty worthless while
>>>flying.
>>>
>>> Glenn
>>>>From: "josok" <josok-e@ukolo.fi>
>>>>Reply-To: europa-list@matronics.com
>>>>To: europa-list@matronics.com
>>>>Subject: Re: Europa-List: Monowheel sight gauge
>>>>Date: Sat, 30 Sep 2006 13:30:46 +0300
>>>>
>>>>
>>>>Hi Ron,
>>>>
>>>>I decided to route the tube up the seatback, back in the seatback over
>>>>the tank, and up to the breather tube. The reason is that i will be able
>>>>to see the fuel level while tanking. The breather tube is connected to
>>>>the top of the filler and has it's opening behind the flap extension.
>>>>You will get the idea of the latter from the attached picture, where you
>>>>see the vent system. This is one of the good ideas of Graham Singleton.
>>>>I am still thinking of adding a one way valve there opening in the
>>>>cockpit, to have a second vent in case the primary one gets blocked.
>>>>
>>>>Kind Regards,
>>>>
>>>>Jos Okhuijsen
>>>>
>>>>
>>>>
>>>>
>>>>-------------------- m2f --------------------
>>>>
>>>>Visit - www.EuropaOwners.org
>>>>http://www.europaowners.org/viewtopic.php?p=12828#12828
>>>>
>>>>-------------------- m2f --------------------
>>>>
>>>>
>>>>Attachments:
>>>>http://www.europaowners.org//zfiles/img_2454_459.jpg
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>
>
> --
> 29/09/2006
>
>
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