WmInce Posted May 15, 2019 Report Share Posted May 15, 2019 33 minutes ago, Warmi said: I am pretty sure the skyview system can do fuel flow which is not just a computation but actual measurement . . . . . Nope, for Flight Design CT airplanes, Duane is correct. Skyview has a fuel transducer (the Red Cube) in the fuel line, which counts fuel flow. But the tanks are void of any actual measuring device, except the visual sight tubes. Once Skyview fuel computer is calibrated, fuel consumption/range/endurance is calculated, based upon onboard fuel quantity, which is entered by the pilot before each flight. It works great! Quote Link to comment Share on other sites More sharing options...
AGLyme Posted May 16, 2019 Report Share Posted May 16, 2019 When I bought the plane, FD-NA told me exactly that (what WmInce said). There are no physical sending units in the tanks themselves. I have found that the fuel computer is amazingly accurate however... in relation to the physical "sticking" of the tanks pre-flight. Quote Link to comment Share on other sites More sharing options...
Buckaroo Posted May 16, 2019 Report Share Posted May 16, 2019 I would really like to modify my CTSW to a fuel selector system with a both, left and right capability. I’m hoping the new GT will offer this system that I can modify my Ct to! Quote Link to comment Share on other sites More sharing options...
Warmi Posted May 16, 2019 Report Share Posted May 16, 2019 37 minutes ago, AGLyme said: When I bought the plane, FD-NA told me exactly that (what WmInce said). There are no physical sending units in the tanks themselves. I have found that the fuel computer is amazingly accurate however... in relation to the physical "sticking" of the tanks pre-flight. That’s because it is not a computer estimating flow based on some generic fuel usage but a physical unit measuring flow of the fuel to the engine. Quote Link to comment Share on other sites More sharing options...
Buckaroo Posted May 16, 2019 Report Share Posted May 16, 2019 12 minutes ago, Warmi said: That’s because it is not a computer estimating flow based on some generic fuel usage but a physical unit measuring flow of the fuel to the engine. These make believe so called information systems are totally useless in my opinion! If fact they could be dangerous used by the novice. Quote Link to comment Share on other sites More sharing options...
AGLyme Posted May 16, 2019 Report Share Posted May 16, 2019 Actually, I find the fuel management in the CT well done. Put gas in the tank, turn on the Master, add the fuel gallonage just added into the "computer" (on top of the fuel that was in the tanks prior to filling)... this is where I compare the sticking of the tank during pre-flight with the fuel quantity remaining figure... again, amazingly accurate. During flight, I check the digital fuel remaining readout and I check the clear tubes in the wing root. Based on my 50 hours of flying the CT (I consider myself a novice), the fuel computer has been a solid source of fuel remaining information building my confidence in the system. I still check the site tubes anyway, it's good practice. In the 'iS" model (fuel injected version of the Rotax), another line of defense is the Header Tank warning light on the panel near the Lane A and B warning lamps. Basically, it is a "gas aint coming in from the wings anymore" warning. The header tank, which is located in the baggage compartment, has about 1.8 gallons of usable fuel. Good feature. Quote Link to comment Share on other sites More sharing options...
FlyingMonkey Posted May 16, 2019 Report Share Posted May 16, 2019 On 4/10/2019 at 5:59 AM, Ed Cesnalis said: Actually you can't prevent it. 8 1/2 gallons is enough where you can't slosh it outboard and it will self balance unless you fight it. When 8 1/2 changes to 2 1/2 I prefer to keep it on one side to better keep it visible longer Do you actually run one tank dry and the other down to 2.5 gallons? If so, why? I have never landed with less than about six gallons, and I don't really see the need to with the big tanks we have, even on very long trips. Quote Link to comment Share on other sites More sharing options...
Ed Cesnalis Posted May 17, 2019 Report Share Posted May 17, 2019 2 hours ago, FlyingMonkey said: Do you actually run one tank dry and the other down to 2.5 gallons? If so, why? Some of my best photo shoots are within 5 miles but above 13,000'. There's virtually no danger that I won't get back and being extremely light gives me good climb rates right up to target altitude. I even lost my engine once but that was from slipping along a very long 13,000' high ridge to keep my wing out of the shot. I got it back very quickly and landed under power. Quote Link to comment Share on other sites More sharing options...
cdarza Posted May 17, 2019 Report Share Posted May 17, 2019 55 minutes ago, Ed Cesnalis said: Some of my best photo shoots are within 5 miles but above 13,000'. There's virtually no danger that I won't get back and being extremely light gives me good climb rates right up to target altitude. I even lost my engine once but that was from slipping along a very long 13,000' high ridge to keep my wing out of the shot. I got it back very quickly and landed under power. Hoping you get back in the air soon - looking forward to more amazing shots. Quote Link to comment Share on other sites More sharing options...
Buckaroo Posted May 17, 2019 Report Share Posted May 17, 2019 On 5/15/2019 at 7:22 PM, Warmi said: That’s because it is not a computer estimating flow based on some generic fuel usage but a physical unit measuring flow of the fuel to the engine. These make believe so called information systems are totally useless in my opinion! If fact they could be dangerous used by the novice. Quote Link to comment Share on other sites More sharing options...
Phil B Posted May 29, 2019 Report Share Posted May 29, 2019 Do the Dynon instruments compute actual fuel usage or some programmed data? Quote Link to comment Share on other sites More sharing options...
WmInce Posted May 29, 2019 Report Share Posted May 29, 2019 4 hours ago, Phil B said: Do the Dynon instruments compute actual fuel usage or some programmed data? It’s not just “programmed data.” A flow transducer “Red Cube” (mechanical water wheel), counts fuel, as it flows through a fuel line. The “flow rate” multiplier can be adjusted within the hardware settings portion of Skyview. The correct calibration is adjusted, based upon actual fuel consumed vs. Skyview calculated fuel consumed. It works great. Instructions are simple and well documented. If it warrants, I usually adjust my calibration following long cross-country fights. Quote Link to comment Share on other sites More sharing options...
Doug G. Posted June 20, 2019 Report Share Posted June 20, 2019 (Strange conversation.) I stick my tanks, put the info (on the conservative side of the measurement) in the Dynon, watch the Dynon measurements and verify it with the sight tubes when it gets that low. I have had no issues and the Dynon is quite accurate. Quote Link to comment Share on other sites More sharing options...
FlyingMonkey Posted June 21, 2019 Report Share Posted June 21, 2019 I have no Skyview or fuel computer. I look at the physical level in the tanks when I put fuel in, verify in the sight tubes, and then monitor the tubes visually throughout the flight. This has worked 100% for me for over five years and 500+ hours of flying, and I don't have to calculate or calibrate anything. With the sight tubes I don't really see a need for a fuel level calculator (but of course if you have a Skyview why not use it), but I would like to have a fuel *flow* meter...it would be nice to be able to measure fuel consumption in flight and adjust and optimize fuel economy vs. speed "on the fly" (pun intended). Quote Link to comment Share on other sites More sharing options...
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