---------------------------------------------------------- Allegro-List Digest Archive --- Total Messages Posted Wed 09/05/07: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 03:04:07 PM PST US From: "Hugh McKay III" Subject: RE: Allegro-List: 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 _____________________________________ Time: 07:44:51 PM PST US Subject: Allegro-List: Re: Allegro 2000 Wing Tanks - Fill/Drain Procedure From: "Aero Siam" 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 _____________________________________ Time: 08:10:44 PM PST US Subject: Allegro-List: Re: Center of Gravity Calculation (C.G.) From: "Aero Siam" 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 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=133021#133021 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message allegro-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Allegro-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/allegro-list Browse Digests http://www.matronics.com/digest/allegro-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.