Today's Message Index:
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1. 03:04 PM - Re: Re: Allegro 2000 Wing Tanks - Fill/Drain Procedure (Hugh McKay III)
2. 07:44 PM - Re: Allegro 2000 Wing Tanks - Fill/Drain Procedure (Aero Siam)
3. 08:10 PM - Re: Center of Gravity Calculation (C.G.) (Aero Siam)
Message 1
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| Subject: | Re: Allegro 2000 Wing Tanks - Fill/Drain Procedure |
Paul:
If it takes 15 min.+/- to fill one tank what is happening to the fuel that
is being pumped to the engine carbs. during these 15 min.? For both tanks
you will be running off the battery for a total of 30 min. +/-. Any problem
with this?
Hugh
-----Original Message-----
From: owner-allegro-list-server@matronics.com
[mailto:owner-allegro-list-server@matronics.com]On Behalf Of Aero Siam
Sent: Tuesday, September 04, 2007 2:49 AM
Subject: Allegro-List: Re: Allegro 2000 Wing Tanks - Fill/Drain Procedure
Hugh
Your assumptions are correct.
The valve has 3 positions - 12 o'clock pump up, 3 normal flight, 6 drain
down. I made a color coded decal for the 3 positions.
Fill the belly tank. Engine off, set valve to pump up and switch on pump.
Open 1 wing tank valve. It takes about 10-15 mins to fill a tank. When full,
the transparent tubes fill with fuel and recirculate back to the belly tank.
Set valve back to normal flight and switch off pump..
In flight, open both wing valves and set to drain down. I think some of the
fuel goes direct to the engine so the belly will appear to refill slowly.
I refill when my guage shows 25 litres or 6.7 gall and stop at 40 litres
(10.8 gall) because my guage shows full at 40 litres. Do this twice in
flight. Return the valve to normal flight.
We measuresd the usable capacity as 18.7 for each wing tank.
I have never overfilled the belly tank. I think it would overflow out of the
overflow tube if the filler cap seal is good.
Note there is a recent Rotax mandatory about electric pumps and certain
serial numbers of Rotax mechanical pumps.
The tanks are expensive and a little fiddly to use but give the plane huge
range and a safety margin for a divert
Regards
Paul
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=132620#132620
Message 2
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| Subject: | Re: Allegro 2000 Wing Tanks - Fill/Drain Procedure |
Hugh
Fuel does not flow into the carbs - the floats hold the needle valves closed.
I have not had any problems with the battery after using it for 30 mins
I enclose a photo of the plumbing in the pump area
Regards
Paul
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=133014#133014
Attachments:
http://forums.matronics.com//files/pict2961_163.jpg
Message 3
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| Subject: | Re: Center of Gravity Calculation (C.G.) |
Hugh
Thom Riddle has an Excel sheet for calculating the CG on the Allegro. You can download
it from my site. This only applies to his aircraft but gives a good approximation
for any Allegro UL.
http://www.aero-siam.com/page12.html
Thom is very helpful as you can see from his frequent posts and I am sure he can
answer questions you have.
On my Allegro 912S, the CG is near the forward limit. This increases the stall
speed slightly but makes the plane's handling safer than a rear CG.
Regards
Paul
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http://forums.matronics.com/viewtopic.php?p=133021#133021
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