VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Model Specific > RV-12
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 08-22-2017, 08:55 PM
Phantom30's Avatar
Phantom30 Phantom30 is offline
 
Join Date: Jul 2009
Location: Coeur d'Alene, ID/Casa Grande, AZ
Posts: 574
Default RV-12 S-LSA w/GPH R/O G3X

My buddy is renting RV-12 S-LSA that is equipped with Garmin G3X that has GPH and fuel totalizer...I didn't know this was available on the G3X???

Anybody else know anything or have seen this????
__________________
Ric Dickison
307 (CAB) Phantom
Search and Destroy (Can
Tho RVN)
Distinguished Flying Cross Society Member
CH-47 & UH-1H "Driver"
Rotax 9 Series Service IRMT

RV-12 Kit#729 "N312RD" is now a full functioning fun machine!! Thanks Van for fulfilling my dream😎
2017 Dues Paid
Reply With Quote
  #2  
Old 09-05-2017, 10:31 AM
Azjulian Azjulian is offline
 
Join Date: Dec 2015
Location: Scottsdale, Arizona
Posts: 123
Default

you can turn it on - as the red fuel flow cube is connected to the G3x. the problem is that because of the return flow of fuel that isn't metered you are never going to get accurate readings (although you could rough estimate for cross country flights based on data gathered).

I was considering adding a fuel flow cube on the return line, but I really don't want to mess in any way with my fuel system even if it is the return line - want to keep it simple.
Reply With Quote
  #3  
Old 09-05-2017, 11:56 AM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 7,062
Default

Quote:
Originally Posted by Azjulian View Post
you can turn it on - as the red fuel flow cube is connected to the G3x. the problem is that because of the return flow of fuel that isn't metered you are never going to get accurate readings (although you could rough estimate for cross country flights based on data gathered).

I was considering adding a fuel flow cube on the return line, but I really don't want to mess in any way with my fuel system even if it is the return line - want to keep it simple.
You can actually adjust it for very accurate readings, but at only one specific flight condition (such as continuous cruise), just like Skyview/HDX RV-12's do.
If the airplane spends a lot of time flying in different flight conditions (such as doing touch&goes), it will have some error but always in the conservative direction.
__________________
Any opinions expressed in this message are my own and not necessarily those of my employer.

Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
Reply With Quote
  #4  
Old 09-05-2017, 04:29 PM
Phantom30's Avatar
Phantom30 Phantom30 is offline
 
Join Date: Jul 2009
Location: Coeur d'Alene, ID/Casa Grande, AZ
Posts: 574
Default

Quote:
Originally Posted by rvbuilder2002 View Post
You can actually adjust it for very accurate readings, but at only one specific flight condition (such as continuous cruise), just like Skyview/HDX RV-12's do.
If the airplane spends a lot of time flying in different flight conditions (such as doing touch&goes), it will have some error but always in the conservative direction.
Scott...is there any info as to what k factor to use...or is it the same as for Dynon? (Would guess some playing with #'s is required).
__________________
Ric Dickison
307 (CAB) Phantom
Search and Destroy (Can
Tho RVN)
Distinguished Flying Cross Society Member
CH-47 & UH-1H "Driver"
Rotax 9 Series Service IRMT

RV-12 Kit#729 "N312RD" is now a full functioning fun machine!! Thanks Van for fulfilling my dream😎
2017 Dues Paid
Reply With Quote
  #5  
Old 09-05-2017, 04:34 PM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 7,062
Default

Quote:
Originally Posted by Phantom30 View Post
Scott...is there any info as to what k factor to use...or is it the same as for Dynon? (Would guess some playing with #'s is required).
Nothing is published because they are always slightly different from one RV-12 to another.
__________________
Any opinions expressed in this message are my own and not necessarily those of my employer.

Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
Reply With Quote
  #6  
Old 09-05-2017, 05:49 PM
rjtjrt rjtjrt is offline
 
Join Date: Mar 2006
Location: Australia
Posts: 685
Default

Quote:
Originally Posted by rvbuilder2002 View Post
You can actually adjust it for very accurate readings, but at only one specific flight condition (such as continuous cruise), just like Skyview/HDX RV-12's do.
If the airplane spends a lot of time flying in different flight conditions (such as doing touch&goes), it will have some error but always in the conservative direction.
Is there any reason not to install a second red cube (on the return line) so completely accurate fuel calculations in all conditions can be seen?
Reply With Quote
  #7  
Old 09-06-2017, 11:44 AM
RFSchaller RFSchaller is online now
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,132
Default

The fuel flow and gas gage are nice, but my primary method in every aircraft has always been fuel burn and time. If you use the same cruise settings you can get within a few tenths of a gallon. It's always been satisfying to do the mental math and have it confirmed by the gas pump totalizer at the FBO. If you don't cut your margins razor thin the Gage's are just a sanity check on your math.
Reply With Quote
  #8  
Old 09-29-2017, 03:38 PM
Phantom30's Avatar
Phantom30 Phantom30 is offline
 
Join Date: Jul 2009
Location: Coeur d'Alene, ID/Casa Grande, AZ
Posts: 574
Default

Quote:
Originally Posted by RFSchaller View Post
The fuel flow and gas gage are nice, but my primary method in every aircraft has always been fuel burn and time. If you use the same cruise settings you can get within a few tenths of a gallon. It's always been satisfying to do the mental math and have it confirmed by the gas pump totalizer at the FBO. If you don't cut your margins razor thin the Gage's are just a sanity check on your math.
Rich,

I too, learned to fly without the fancy electronics; but I have to say (since I've gotten use to using them) situational awareness has vastly improved, and comfort factor is far better. Case in point....my gph fuel rate went up during last phase of flight to AZ. When I got on the ground..guess what I found; fuel dripping from lower engine cowl. Yup..dam carb floats on right carb are being replaced. Little did I know that the higher than usual fuel flow indication was telling me something was wrong! Go figure!!
__________________
Ric Dickison
307 (CAB) Phantom
Search and Destroy (Can
Tho RVN)
Distinguished Flying Cross Society Member
CH-47 & UH-1H "Driver"
Rotax 9 Series Service IRMT

RV-12 Kit#729 "N312RD" is now a full functioning fun machine!! Thanks Van for fulfilling my dream😎
2017 Dues Paid
Reply With Quote
  #9  
Old 09-29-2017, 07:13 PM
rjtjrt rjtjrt is offline
 
Join Date: Mar 2006
Location: Australia
Posts: 685
Default

Quote:
Originally Posted by rjtjrt View Post
Is there any reason not to install a second red cube (on the return line) so completely accurate fuel calculations in all conditions can be seen?
I received this from Van's Aircraft in response to my question:

"I have no reasons to tell you not to install a second flow transducer. We opted to only use one as it proved accurate enough for our needs.

Sterling

Van's Aircraft
14401 Keil Rd"
Reply With Quote
  #10  
Old 09-29-2017, 08:15 PM
DHeal DHeal is offline
 
Join Date: Sep 2006
Location: Windsor, California
Posts: 615
Default

If your RV-12 is an S-LSA you must have Van's approval to install the second fuel flow cube. If you are E-LSA (post certification) or E-AB you can do what you want without Van's approval.
__________________
David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B) - N124DH flying since March 2014 - 570+ hours (as of Dec 2017)!
VAF donation through June 2018.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 09:26 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.