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Old 09-10-2017, 08:04 PM
Phantom30's Avatar
Phantom30 Phantom30 is offline
Join Date: Jul 2009
Location: Coeur d'Alene, ID/Casa Grande, AZ
Posts: 608
Default Setting up gph k factor on -60 red cube

Okay, I have finally got gph flow thingy on my G3X. When I turn on master (aux fuel pump running), I'm showing 1 gph fuel flow (engine not running).

Obliviously, I need to adjust k factor to account for return to tank fuel flow. Current k factor is 68,000 (I think)...anybody got suggestions as to how much and what direction to fix?
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😎
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Old 09-10-2017, 08:29 PM
rjtjrt rjtjrt is offline
Join Date: Mar 2006
Location: Australia
Posts: 700

I got 107829 after a 1 hour cross country flight.

A more recent discussion here:-

I recently asked Van's support about putting a second red cube onto the return line and got this reply:-

"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.


Van's Aircraft
14401 Keil Rd
Aurora, Oregon 97002

Last edited by rjtjrt : 09-10-2017 at 08:32 PM.
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Old 09-11-2017, 05:36 AM
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snopercod snopercod is offline
Join Date: Aug 2016
Location: Asheville, NC
Posts: 967

I always start with empty wing tanks, then add a known quantity - 20-30 gallons or so. After burning that down to empty tanks again, I compare how much I actually burned to what the totalizer says and adjust the K factor accordingly. (I can completely empty the wings on my plane because my engine runs off a header tank.)

If you can't empty the wings in flight and if you have a scale, you can weigh the gas you drain out of the wings.
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