---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Tue 05/24/05: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:34 PM - funny fuel gauge (Rmi Guerner) 2. 10:48 PM - Mixture control for 914 (Ronald J. Parigoris) 3. 10:55 PM - Re: DOTH Wednesday - Panshanger? (Paddy Clarke) 4. 11:00 PM - Emergency Locator Systems.... (R.C.Harrison) 5. 11:08 PM - Enstone DOTH (Bryan Allsop) 6. 11:28 PM - Rotax Parts diagram online and quick (Ronald J. Parigoris) ________________________________ Message 1 _____________________________________ Time: 01:34:44 PM PST US From: "Rmi Guerner" Subject: Europa-List: funny fuel gauge From: "R\351mi Guerner" Europa-List message posted by: "Rmi Guerner" Hi all, Surprisingly I get just the opposite with the Avelec capacitance fuel gauge: when full with mogas I consistently read 60 liters, and with Avgas 100LL I read 50 liters. I also have another problem with this fuel gauging system: from time to time I have an "fuel tank fault" indication, or zero indication while the tank is full. Very difficult to troubleshoot as the problem is intermittent. Yesterday it happened only during a few minutes in the middle of a 3 hours flight. Any idea? Remi Guerner F-PGKL, XS 912S, s/n 395 monowheel, 320 hours Subject: Re: Europa-List: Funny fuel gauge --> Europa-List message posted by: "Peter Rees" Thats exactly the problem we had. Problem is that the gauge was calibrated for Avgas - when we changed to Mogas, the gauge said that the tank was always 3/4 full. ________________________________ Message 2 _____________________________________ Time: 10:48:52 PM PST US From: "Ronald J. Parigoris" Subject: Europa-List: Mixture control for 914 --> Europa-List message posted by: "Ronald J. Parigoris" Is anyone flying with a mixture control for 914? How are you doing it, how does it perform? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I am about done for a while studying up on 914. Unless someone convinces me otherwise, I will install a mixture control of sorts. Instruments I have: 2 UMA EGTs, one for left side and 1 for right 1 CHT but with switch to measure left and right Split Second O2 monitor, pretty slick readout with a number of LEDs at center is Lambda of 1. They mapped the O2 sensor they use quite extensive, so i am pretty certain it will give more information than just being a switch, like most 3 wire O2 sensors are used on cars. OK Mixture control. simple, change pressure going to the float bowl! 1 switch, 1 knob, 3 LEDs. The 914 is turbocharged. When operated with MP under ambient, you could vent the float bowl to atmosphere. OK until you raise the MP over ambient. At that point you would begin to spew out the overflow and no fuel would be flowing into the manifold, it would go the other way. Rotax engineers most of the time connect the float bowls to airbox pressure. The carbs are adjusted to work using airbox pressure as a constant. Side Note, it is absolute critical that you have a good no leak free flow connection to this connection, as well as the airbox to fuel pressure regulator OR ELSE!! Now when you go over approx. 100% power, the ECU looks for combo of certain RPM and MP to determine that in fact you are making some heat. Once it determines this, it then switches the plumbing from airbox pressure to above airbox pressure. The way it does this is there is a 12 volt 3 connection switch/solonoid. Output goes to float bowls, there are 2 inputs, 1 from airbox normal pressure, 1 from a portion of airbox that gets hit with impact air and is in fact over airbox normal. First off i will have a 2 position DPDT switch. 1 position will be Auto Rich where in fact ECU controls Rich, and the second position will be Rich, where in fact it will be rich all the time. First off Rich Mixture is much more desirable than lean. So manual rich can be used to determine if rich of peak EGT, can probably be used to help cool down a hot motor and can be used in conjunction with choke to get you to a safe place if any number of things happens that causes a lean mixture. Also if for any reason my Lean control fails for any reason, by selecting Rich it will take it out of the circuit. The Lambda display wants things when making some heat at full scale rich, or 1 LED less. Will have a Blue LED come on when ECU is asking Solenoid to come on, and will have another flashing Blue come on when Rich is selected. Now for lean. Even though the Bing type 64 is somewhat altitude compensating, and does even a little better if turbocharged, none the less when you fly in thin air, the thinner the air gets, the richer things run. OK. Concept is since when you increase pressure to float bowl it gets richer, then if you decrease, it will get leaner. Now this is a turbo, so to have a chance at some sort of linear control, you need to have some means of a lower than airbox pressure that is constant changing with the airbox pressure. Not just vent or intake from atmosphere. I will plumb into the balance tubes between the cylinders. This is MP, that from what i am told (I have yet to test) is about 1 inch below airbox pressure. So concept is to T the airbox line going to the Airbox normal side of the 3 way solenoid/switch. Connect the extra nipple to a pilot controlled valve that then goes to the MP Balance tube. In other words leak some pressure to the Manifold (Which BTW also leans things out, will be limited volume though). Now if you hit Rich button it bypasses this in event of a problem. I have all stuff to do a ground test, and after test can determine what size of restrictor to install on MP leak so just enough can be allowed to leak. I will have a blinking Red LED situated so the knob extension will cover the LED when it is in Normal (richest position it can get). This way if Auto Rich or Rich is asking for rich, then the red LED will begin to get bright and flash. If not in Normal it will get your attention. Other times the Red LED will glow dimly. There you have it. 1 switch, 1 knob, 3 LEDs. Testing before I install lean control in panel will determine just how well it works, and if leak serious affects my MP gauge reading, and just how much the leak leans out due to pushing extra air downwind of carbs. No matter what will install Rich button. I scratch built a ~ 7,500HP Carburetor (A 30,000,000 BTU) hot air balloon burner in 1985 that is still flyin my machine, making this smaller task pay attention superficial seems to be a PIECE OF CAKE. (famous last words, overheated cylinders, melted/broken pistons, trashed gearbox, warped exhaust, seized turbo and bent connecting rods with extra venting in the crankcase on a new motor that didn't even fly yet.) Ron Parigoris ________________________________ Message 3 _____________________________________ Time: 10:55:19 PM PST US From: Paddy Clarke Subject: Re: Europa-List: DOTH Wednesday - Panshanger? --> Europa-List message posted by: Paddy Clarke Hi Bryan, Panshanger has a great little restaurant - the apple pie is amazing!!. Hope to see you there,Cheers > Paddy Clarke Europa XS - 404 G-KIMM ________________________________ Message 4 _____________________________________ Time: 11:00:07 PM PST US From: "R.C.Harrison" Subject: Europa-List: Emergency Locator Systems.... --> Europa-List message posted by: "R.C.Harrison" Hi! All Anyone aware of purchase cost and likely operational costing capability of the use of Satelinx International Incorporated equipment as an emergency locator? It seems to be wristwatch size and all singing all dancing utilising GPS and wireless systems .? I guess it doesn't have an emergency signal capability though so it would be probably be too late for the bearer ! Regards Bob Harrison G-PTAG Robt.C.Harrison ________________________________ Message 5 _____________________________________ Time: 11:08:50 PM PST US From: "Bryan Allsop" Subject: Europa-List: Enstone DOTH --> Europa-List message posted by: "Bryan Allsop" 12 Mid day tomorrow, Wednesday. Weather looks OK. Cheers Bryan ________________________________ Message 6 _____________________________________ Time: 11:28:22 PM PST US From: "Ronald J. Parigoris" Subject: Europa-List: Rotax Parts diagram online and quick --> Europa-List message posted by: "Ronald J. Parigoris" I still have dial up. Here is a site that quick loads online. It says 912, but also has 914. If book is not near my computer I find it useful. http://www.ultralightnews.ca/rotax912/index.html Ron Parigoris