The Murphy Builders Site

I have sent again, with a proper subject so it is searchable for archives
material!

----- Original Message -----
From: "Wayne G. O'Shea" <oifa@irishfield.on.ca>
To: <murphy-rebel@dcsol.com>
Sent: Saturday, September 01, 2001 10:32 AM
Subject: Re: Paddle Holder

Brian, I feel this happens due to the restrictions at fittings going into
the tanks. Even though minute, this means that there is more ram air
pressure on the top of the sight gauges, than the pressure value that

makes

it into the tank itself. This obviously means that the fuel level will go
down in the sight gauge as there is a higher pressure at the top, than the
port at the bottom from the tank.

On Bob's "XWI" the ram air tubes are on the fuel caps and I don't remember
the sight gauges being effected that much, as compared to the amphib I

sold

that had the ram air in the cross vent. It seemed to work quite accurately
because now the opposite would apply. More pressure in the tank, than at

the

top of the sight gauge tube that would help hold the fuel level in the
correct place. Please BOB correct me if you are observing something
different in the 125 hours or so (MUST BE NICE!) of flying since XWI left
here just over a year ago, but that is what I remember.

My personal Rebel's ram air is ala Cessna, from behind the right wing

strut,

but I have float senders so can't tell you if this would help the sight
gauges (although I imagine it would, but isn't an after the wings done
option!)

Regards,
Wayne G. O'Shea
www.irishfield.on.ca

----- Original Message -----
From: "brian amendala" <solongez@hotmail.com>
To: <murphy-rebel@dcsol.com>
Sent: Saturday, September 01, 2001 10:10 AM
Subject: Re: Paddle Holder

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Wayne, is there a way to redo the vent. Mine is cross vented and if I

blow

into the hole the fuel gets blown out of the sight guages, so when I get

low

it shows no fuel in the tanks. I have already put a restrictor in the

BOTTOM

el of the sight guages and was wondering if there was something else I

could

do to stop the pressure on the guage...Thanks....Brian

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Brian, Stop flying with less than 5 gallons of fuel in each tank! Then

you

will not get as nervous!!!

Seriously, you must have the site gauge in MAM's newer (ridiculous)
straight
up/down position on the front end of the fuel tank. I know this without
asking first, as 5 gallons US just wets the bottom of the tank at the
filler
neck in the 3 point position, and even on amphibs the dip stick doesn't
change that much. You need the lower fitting, for the tube style sight
gauge, to be as far back on the tank as possible if you want it to be

of

any
use. I'm not interested in seeing max fuel, but I sure want to know

when

I'm
getting low!!! On any that I have been "refurbing", which includes

removing

the sight gauge from the tee at the fuel outlet (as the original MAM
installation does draw air into the fuel line!!), I have been

installing

a

new tank fitting about 1 3/4" forward of the original outlet fitting.

Only

drill a small hole at the lower edge of where the tank fitting will

sit.

This gives you an automatic restricter hole to stop the sloshing around

on

the sight tubes. Also this way you are only drilling about 6 #30 holes

in

the finished tank so aluminum chips shouldn't be a problem in the tank.

You

may be able to do this with the wings installed using an angle drill

and

a

hand riveter. The other possible cause, if you have the sight tube on a
slant like I have described, is I have seen installations where the

tubing

from the tank through the fuselage root ran up hill. You need to make

sure

that the tube is coming though level or downhill from the tank into the
cabin to show a fairly accurate amount at low fuel levels otherwise the
tube
just drains back downhill into the tank when low on fuel.

Regards,
Wayne G. O'Shea
www.irishfield.on.ca

----- Original Message -----
From: "brian amendala" <solongez@hotmail.com>
To: <murphy-rebel@dcsol.com>
Sent: Thursday, August 23, 2001 7:22 PM
Subject: Re: Paddle Holder

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a

get

to like
I

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very

many

and

minutes

tube

with

1/4"

inches Drill

Velcro.

full

his

so

boat

each

year,

to

slip spreader

in

secured.

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