Today's Message Index:
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1. 01:33 PM - Oil Thermostat (Bernhard10)
2. 05:34 PM - Allegro 2000 Wing Tanks - Fill/Drain Procedure (Hugh McKay III)
3. 11:49 PM - Re: Allegro 2000 Wing Tanks - Fill/Drain Procedure (Aero Siam)
Message 1
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Due to the cooler temperatures here in the NW my oil temps stay mostly on the cool
side and it take a pretty long warm up period to reach the min. temp..
I decided to buy and Oil thermostat from CPS ( see attached pic )
I am curious if anybody is using this thermostat and if so, how & where did you
mount it ??
Some pictures would greatly help.
Thanks in advance
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Message 2
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Subject: | Allegro 2000 Wing Tanks - Fill/Drain Procedure |
Gentlemen:
I have aluminum wing tanks on my Allegro 2000, but have not yet used them. I
have a number of questions relative to using these tanks. If any of you have
wing tanks, what is the procedure you follow to fill the two tanks. Also
what is the procedure to follow to drain them back to the main belly tank? I
assume you use the electric fuel pump to fill the wing tanks, pumping fuel
from the main tank to one wing tank, and then to the other wing tank. How do
you know when the tank is full? Can you see fuel returning to the main tank
through the clear overflow line? How long does it take to fill one tank
using the electric fuel pump? I also assume you do this pumping using the
battery with the engine off. Correct?
If you are flying and you need the fuel from the wing tanks, I assume you
cut the electric fuel pump off and open each wing tank valve to drain back
to the main tank. The two wing tanks combined hold aprx.10 gallons (5
gallons each). If you start draining the 10 gallons before you have enough
empty volume in the main tank, what happens when the main tank fills? Does
it fill over the lip of the fuel tank cap on the side of the plane? When you
normally fill the main tank you can never fill the tank higher than the lip
of the cap opening (i.e. this is a full tank!). I am somewhat confused about
this whole matter, and would appreciate some guidance and direction.
Hugh McKay
Allegro 2000
Rotax 912 UL
N661WW
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Subject: | 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
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