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11-13-2015, 06:48 AM
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Join Date: Feb 2005
Location: Chesterfield, Missouri
Posts: 4,514
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Quote:
Originally Posted by TXFlyGuy
There is nothing worse than being in the air, and wishing you were on the ground...
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AMEN ++++ 
__________________
RV-12 Build Helper
RV-7A...Sold #70374
The RV-8...Sold #83261
I'm in, dues paid 2019 This place is worth it!
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11-13-2015, 01:04 PM
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Join Date: Sep 2007
Location: BC
Posts: 1,674
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Two things about a fuel totalizer...
The obvious one already mentioned... It cannot detect a fuel tank/line leak upstream of the fuel flow measuring device. While rare and unusual, you still need to know and that's one point of continuous measuring other than with dip sticks.
2) If you forget to use the "fuel added" feature, you will be reminded by the low fuel warning setting. Now you have to guess how much you bought/added and add it to the totalizer while doing all the other flying tasks or mental gymnastics. Either way it's a distraction. If you're wrong, you have inaccurate fuel level indication and will be wishing you had the floats which are great for the lower fuel levels.
Bevan
__________________
RV7A Flying since 2015
O-360-A1F6 (parallel valve) 180HP
Dual P-mags
Precision F.I. with AP purge valve
Vinyl Wrapped Exterior
Grand Rapids EFIS
Located in western Canada
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11-13-2015, 02:23 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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Quote:
Originally Posted by TXFlyGuy
If you have fuel flow rate in gph, or pounds per hour, and total fuel burned, plus a known quantity at the start, you should be good.
...
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As Gary pointed out earlier, if you fly at night or IFR having just (one) totalizer doesn't meet the letter of the law - unless you have just one fuel tank. Which tank would you select for landing? I agree this question can be answered by careful record keeping, but that's a lot of extra work.
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11-13-2015, 02:39 PM
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Join Date: Mar 2006
Location: Evansville, Indiana
Posts: 661
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If I don't turn off the boost pump on takeoff my fuel totalizer is off. If turned off the totalizer is always within a 1/4 gallon at refuelling.
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______________________
Steve Eberhart, W9JUQ
3EV - Evansville, IN
Where is Steve and the Sky Terrier?
RV-7A Slider, O-360 A1A, Catto 3 blade, 2 screen Garmin G3X Classic, GTN 650, Bionics APRS. FLYING since June 24, 2009
EAA Chapter 21
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11-13-2015, 04:01 PM
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Join Date: May 2012
Location: Jazz Town, USA, TX
Posts: 501
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We have 6 tanks, 5 quantity indicators, plus a fuel totalizer (G3X). Are we good to go? The 6th tank is a small header tank that everything feeds into before going to the fuel pumps.
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12-15-2015, 02:46 PM
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Join Date: Jan 2008
Location: Atlanta, GA
Posts: 240
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Quote:
Originally Posted by newtech
If I don't turn off the boost pump on takeoff my fuel totalizer is off. If turned off the totalizer is always within a 1/4 gallon at refuelling.
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I've experienced similar things with my totalizer, but best I can figure, I get an inaccurately high FLOW reading, but the total quantity used figure seems accurate.
I believe the cause of this is fluctuations in fuel pressure caused by the pump making the wheel in the flow sensor rock back and forth across a count.
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Ian
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12-15-2015, 03:10 PM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,652
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The military jet that I work on has a single totalizer as the only method of indicating fuel level to the pilot. This totalizer is set prior to flight by hand, following direct measurement of fuel level with a dipstick.
Personally, I'd be perfectly comfortable in a homebuilt with totalizer as long as I had a "5 gallons" and "empty" light for each tank.
__________________
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
Last edited by Toobuilder : 12-15-2015 at 07:59 PM.
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12-15-2015, 07:10 PM
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Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,692
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My EFIS, as Im sure many others do, shows combined fuel gage data as a dot on the fuel totalizer bar. Theoretically it should match the top of the bar at all times. Mine does not because the data from the tank level sensors is not linear (there is a kink in the middle which I suspect is either coverage of the outboard capacative sensor or simply tank volume geometry). I have things set for accuracy at the lower end, towards empty.
This is all moot if one follows the mantra:
Take off after filling the tanks and then drinking 2 cups of coffee. Then the fuel gages don't matter anymore. 
__________________
Bill Pendergrass
ME/AE '82
RV-7A: Flying since April 15, 2012. 850 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
Yeah. The boss got a Silhouette Cameo 4 Xmas 2019.
Last edited by rzbill : 12-15-2015 at 07:13 PM.
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12-15-2015, 08:26 PM
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Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,247
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Quote:
Originally Posted by rzbill
Take off after filling the tanks and then drinking 2 cups of coffee. Then the fuel gages don't matter anymore. 
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Yeah, but I can't stay in the pattern ALL the time.
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Dale
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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12-16-2015, 09:57 AM
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Join Date: Sep 2007
Location: Hudson County, NJ
Posts: 1,092
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Quote:
Originally Posted by newtech
If I don't turn off the boost pump on takeoff my fuel totalizer is off. If turned off the totalizer is always within a 1/4 gallon at refuelling.
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always until it's not
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