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  #11  
Old 02-15-2013, 07:13 AM
gtmule gtmule is offline
 
Join Date: Oct 2007
Location: Macon, GA
Posts: 499
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I think I like the idea of mounting it Aft of the firewall more and more. Two less connections getting fatigued, some chance of spotting a fuel leak (at least a major one), one less hose. 4 less FWF connections to leak, less clutter, etc.

I will say IF the unit is affected by the electric pump (I'm carbed, with the pump on the firewall, so I don't think it would be) you'll want to calibrate it whenever way indicates LOWER fuel flow (pump on or off), so you're always conservative with quantity remaining.
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  #12  
Old 02-15-2013, 09:03 AM
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jdeas jdeas is offline
 
Join Date: Mar 2006
Location: SoCal
Posts: 626
Default Flow around bends

The reason I placed my cube away from the FW connection was due to the sweep of the tubing. I read somewhere in the installation to be careful of turns on the fuel line near the red cube. Placing it just foward of the existing fuel pump doghouse gave the least amount of curves near the cube.
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  #13  
Old 02-16-2013, 12:24 AM
vickruis vickruis is offline
 
Join Date: Dec 2007
Location: Breda, The Netherlands
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I also mounted mine in the tunnel.

Usually, when I opened the canopy, I would smell the leather seats. After 6 months of flying, that smell was replaced by a very faint smell of avgas.
I finally spotted a blue stain under the red cube, and it appeared that I had forgotten to use fuelube on the fitting... Oops, but easy to fix.

Would I put the red cube in the tunnel again? Yes, the leak I had would probably stay unnoticed for months if the red cube would be forward of the firewall. I does create an extra point of failure inside the cabin, but any failure would be noticed much earlier.

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  #14  
Old 02-16-2013, 12:14 PM
pa38112 pa38112 is offline
 
Join Date: Mar 2008
Location: Clarksboro, NJ
Posts: 829
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Here is what I am thinking of doing - connecting the red cube to my electric fuel pump with a nipple. My other option is to put it closer to the rudder, but I don't want it to be in the way of my feet. Any thoughts or suggestions ?

[IMG][/IMG]
Option one

Option two

Last edited by pa38112 : 02-16-2013 at 12:17 PM.
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  #15  
Old 02-18-2013, 08:56 AM
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Taildrgr Taildrgr is offline
 
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Location: DFW Area, TX
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When mounting the red cube in the RV-7A tunnel, is it necessary to make a physical connection of the cube to the fuselage floor, or will the 3/8 fuel tubing provide a stiff enough mount? I have 1/8" foam insulation on the floor and the cube sits on top of the thin foam. It seems pretty rigid this way, but I am curious about the experts opinions.
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  #16  
Old 02-18-2013, 09:06 AM
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Walt Walt is offline
 
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
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Quote:
Originally Posted by vickruis View Post
I also mounted mine in the tunnel.

Usually, when I opened the canopy, I would smell the leather seats. After 6 months of flying, that smell was replaced by a very faint smell of avgas.
I finally spotted a blue stain under the red cube, and it appeared that I had forgotten to use fuelube on the fitting... Oops, but easy to fix.
Don't use fuel lube or you will be doing the job again soon
There are others but this one works pretty good.

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  #17  
Old 02-18-2013, 09:21 AM
Geeman Geeman is offline
 
Join Date: Apr 2010
Location: Novato, CA KDVO
Posts: 377
Default Downstream or upstream of the electric pump?

I am about to start this installation in my RV-6. My facet electric is mounted on the firewall. I thought about installing the fuel meter in the fuselage upstream of the electric. Between the selector and the electric.

Will this work?
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  #18  
Old 04-08-2013, 06:45 PM
WenEng WenEng is offline
 
Join Date: Aug 2008
Location: Jacksonville, FL
Posts: 522
Default This look OK for red cube mounting in tunnel?

I guess it works about anywhere according to all who have mounted it everywhere... And, as Brian often mentions in Red Cube threads, the tubing does not need to be straight in or out. Thats a never ending misconception. Anyway, I think this will be ok and if not, I can always move it, eh?
I like this location for wiring, for fuel leak inspection, for less heat, less vibration. Besides, red and black look cool together....




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Last edited by WenEng : 10-30-2017 at 01:45 PM.
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  #19  
Old 04-09-2013, 10:51 AM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
Join Date: Jan 2005
Posts: 3,646
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Quote:
Originally Posted by RV10Rob View Post
Even if you do plan to use it to measure total fuel consumption, it isn't a problem. The error is small enough (at least on the RV-10) and the electric pump runs so infrequently that the net effect on the fuel consumption data is inconsequential.
I'm working through this issue right now. I have my floscan after the fuel selector and before the boost pump. Rob's point is probably correct for times when you're flying cross-country with the fuel pump off the vast majority of the time. However, if you mix in any time doing pattern work, where the pump is always on, your totalizer will likely be significantly off the next time you do a fill up. In my case, my fuel flow will read about 2gph higher with the pump on then when the pump is off.

Also, while the transducers come with a default or preliminary k-factor to program into your EFIS, you still have to adjust/calibrate it for your particular installation. It's hard to figure out a new, more correct k-factor if at any point the boost pump was on between fill-ups. The point I'm trying to get at is if you do not do this calibration and do it accurately, your EFIS will not necessarily be showing actual fuel flow even when the fuel pump is off.

The good news is that if you try to calibrate the k-factor for a tank of gas in which the pump was on at any time, your totalizer will error on the conservative side (read less than what you really have).

In retrospect, I would have put my floscan forward of the firewall. Anyway, just some things to think about.
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Last edited by alpinelakespilot2000 : 04-09-2013 at 12:07 PM.
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  #20  
Old 04-09-2013, 12:24 PM
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rleffler rleffler is offline
 
Join Date: Jun 2006
Location: Delaware, OH (KDLZ)
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Quote:
Originally Posted by Taildrgr View Post
When mounting the red cube in the RV-7A tunnel, is it necessary to make a physical connection of the cube to the fuselage floor, or will the 3/8 fuel tubing provide a stiff enough mount? I have 1/8" foam insulation on the floor and the cube sits on top of the thin foam. It seems pretty rigid this way, but I am curious about the experts opinions.

I can't comment on the applicability in a RV-7, but in the RV-10, the red cube was intended to be mounted on VA-188, which raises the cube about a 1/4" off the tunnel floor. This would be a more secure method if there is room for the mount in the RV-7.
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