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  #11  
Old 05-18-2021, 08:30 AM
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rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
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Quote:
Originally Posted by BillL View Post
This would be true if the sensor is measuring both engine usage and bypass flow. A less than desirable way to plumb the system, it would seem, although it could work nicely with internal calculations instead of a direct reading panel result, or the bypass is very small, like to prevent vapor lock or for vapor collection and purge.
This is exactly how the system is designed, and operates.


Quote:
Originally Posted by BillL View Post
edit - I see this is a linear shuttle pump and with the pressures must be a carb. I don't understand where this orifice bypass is. Sorry for confusion.
You are posting to a discussion in the RV-12 forum. The RV-12 has two carbs actually, and because of that, a fuel system that is a bit different that what is common on the rest of the RV models.
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  #12  
Old 05-18-2021, 11:40 AM
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Piper J3 Piper J3 is offline
 
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So, several flights now with the new 40135 Facet electric fuel pump. Looks like 0.3-0.5 add'l fuel flow showing in cruise flight. I'll adjust "K" factor at some point - just not now.
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
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Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 670

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  #13  
Old 05-18-2021, 12:15 PM
seagull seagull is offline
 
Join Date: Dec 2019
Location: San Bernardino
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Quote:
Originally Posted by Piper J3 View Post
So, several flights now with the new 40135 Facet electric fuel pump. Looks like 0.3-0.5 add'l fuel flow showing in cruise flight. I'll adjust "K" factor at some point - just not now.
I am seeing similar in fuel flow but will trend it for a few more hours to be sure. I do not see the fuel remaining changing though.
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  #14  
Old 05-18-2021, 04:55 PM
darata darata is offline
 
Join Date: May 2016
Location: Bend, OR
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Quote:
Originally Posted by lr172 View Post
The red cube DOES have an impeller, though you are correct that it uses an optical sensor to count the impeller revolutions.
Correct!
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  #15  
Old 05-18-2021, 05:16 PM
Taltruda Taltruda is offline
 
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Location: Las Vegas, NV
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Quote:
Originally Posted by lr172 View Post
The red cube DOES have an impeller, though you are correct that it uses an optical sensor to count the impeller revolutions. The K factor is used to convert fractional impeller revolutions to GPH.

Larry
I love it when I learn something! You are right! I thought these were purely optical.. Hereís a Bearhawk guy taking apart his FT-90 gold cube.. I assume they are similar in construction..
Thanks!

https://youtu.be/HXJMLcpcl10
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  #16  
Old 05-18-2021, 10:40 PM
RFSchaller RFSchaller is offline
 
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Location: Phoenix, AZ
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In the end the value of the fuel flow rate is more significant for its consistency than the absolute value. When I see a value Iím not used to it raises an eyebrow.
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