Adjusting fuel flow precision
- Thread starter vlittle
- Start date
It's under SYSTEM SETUP > UNITS I believe (not in front of a unit). You could also divide your K-factor by 10, say, to get more resolution for flow.
skydancer
RV-7 O-360 CS Prop. Dual Skyviews/AHRS. TruTrak AP
Dear Dynon,
Can you be more specific about "divide your K-factor by 10, to get more resolution for flow".
Can you be more specific about "divide your K-factor by 10, to get more resolution for flow".
- Joined
- Mar 23, 2005
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- 13,226
The simple answer is that you can't display L to the tenth.
The conversion is hard coded. We show Gallons to the tenth, but then when we go to L, we change to integers. This is because a liter is .26 gallons, so one L is pretty close to a tenth of a gallon. Conversions between units are always a bit tricky and imperfect for all applications.
So, two options:
1) Go in and change your K factor by 10 like we mentioned. Now your flow will be 300L/hr instead of 30L/hr, but now you have more precision. This WILL mess up your fuel computer (unless you enter 1000L on board instead of 100L). But for temporary use, this will work.
2) You can go into sensor debug in EMS SETUP. Under here, you can see fuel flow to the 1/1000th of a GALLON. This number is always in GALLONS, so be careful. But you can see super precision in here. The absolute accuracy of this number is all up to your K factor, but relative accuracy should be pretty good.
The conversion is hard coded. We show Gallons to the tenth, but then when we go to L, we change to integers. This is because a liter is .26 gallons, so one L is pretty close to a tenth of a gallon. Conversions between units are always a bit tricky and imperfect for all applications.
So, two options:
1) Go in and change your K factor by 10 like we mentioned. Now your flow will be 300L/hr instead of 30L/hr, but now you have more precision. This WILL mess up your fuel computer (unless you enter 1000L on board instead of 100L). But for temporary use, this will work.
2) You can go into sensor debug in EMS SETUP. Under here, you can see fuel flow to the 1/1000th of a GALLON. This number is always in GALLONS, so be careful. But you can see super precision in here. The absolute accuracy of this number is all up to your K factor, but relative accuracy should be pretty good.
So it actually makes sense to use USG instead of liters, because I can get 0.1 gallon resolution. Using liters, I can only get 1L (0.26 gallon) resolution.
I can't use the 10X scaling factor because it wouldn't jive with the float sender values.
I can switch to USG now that I have calibrated my K factor, so that's not a big deal, but I think it would be advisable for non-US customers (i.e. the rest of the world) to properly show liters/hr to the tenth. We purchase fuel in liters.
If you don't think converting to and from metric to gallons or pounds of fuel is a problem, Google "Gimli Glider".
Vern
I can't use the 10X scaling factor because it wouldn't jive with the float sender values.
I can switch to USG now that I have calibrated my K factor, so that's not a big deal, but I think it would be advisable for non-US customers (i.e. the rest of the world) to properly show liters/hr to the tenth. We purchase fuel in liters.
If you don't think converting to and from metric to gallons or pounds of fuel is a problem, Google "Gimli Glider".
Vern
It would be really helpful to have a higher resolution if the fuel flow display ist set to liters (to tweak the RPM and throttle settings). Why don't you just round it to the nearest .25 or .5? With user-defined sensors it is easy ("round=0.25" or "round=0.5") - so we already have the technology. 
MCRider
MCRider