fuel flow transducer

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bearhawk240bprfxxr

I love flying!
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Oct 15, 2014
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which fuel flow transducer do I need for an 0-360 and gravity fee?. I have the red cube and am not sure it is correct for this application.
 
We routinely sell the Electronics International FT-60 (Red Cube), Dynon Avionics P/N 100403-003 for 0-360 engines; it's rated for fuel flow of 0.6 to 70+ GPH.

If you'd like to see your options for other fuel flow sensors (compatible with Dynon EMS units), check out the Electronics International website, scroll down to Fuel Flow Transducers and browse the three options there.

which fuel flow transducer do I need for an 0-360 and gravity fee?. I have the red cube and am not sure it is correct for this application.
Click to expand...
 
Are you certain the red cube is recommended for gravity feed applications? When I did my research and chose the sensor for my gravity feed bearhawk I chose the "gold" cube which is much more expensive....
 
If you'd like to verify this for yourself, suggest contacting Electronics International directly.

Are you certain the red cube is recommended for gravity feed applications?  When I did my research and chose the sensor for my gravity feed bearhawk I chose the "gold" cube which is much more expensive....
Click to expand...
 
Generally the red cube is generally fine for gravity feed applications with flows that a 200 HP engine can achieve. The pressure drop at 18 GPH is only 0.20 PSI.

Fuel is about 1/2 PSI per foot of head, so as long as your fuel tank is 1 foot or more above your carburetor, you can flow 1.5X your takeoff flow.

You should always test your fuel system before your first flight however and make sure the system flows sufficiently.
 
I just talked to electronics international and they recommend the ft-90 [gold cube] for the 0-360 carb gravity feed. It appears Dynon is supplying the wrong transducer for that application. Will you take my red cube in trade for a ft-90.
 
In experimental applications, EI is happy for the FT-60 to be used in gravity feed systems. As you can see by their own document, they do not restrict it, but require you to do a flow test (as you should always do). So please make sure the people you talked to at EI are aware of your application. They have specifically told us the FT-60 is appropriate and in fact changed their document to remove the gravity restriction:

http://dynonavionics.com/public_html/yabbfiles/Attachments/FT-60_rev_F-7_2013.pdf

If you really do want to change, Dynon does not sell the FT-90. You will need to acquire that someplace else, and return the FT-60 to where you purchased it from.
 
I've been using the red cube in my Glastar since I installed the Skyview when it was first released. It's never been an issue and is within 1% accuracy in the gravity flow system feeding my 180hp O-360. It has been well tested and proven at extreme angles of attack and full throttle.
 
Where do you place the transducer best please? I see a difference between
http://dynonavionics.com/public_html/yabbfiles/Attachments/FT-60_rev_F-7_2013.pdf
which requests installing it downstream of the last fuel pump
and Skyview Installation Guide page 7-58: 'It is common to place the sensor downstream of any auxiliary electric boost pumps but upstream of the engine driven fuel pump.'

In my case it would be much easier to install it upstream of the engine driven fuel pump, but I fear vapour lock. Dynon, can you please clarify, taking into account that I have also a O360 gravity fed from low wing?

Thanks, Stefan
 
The general rule I have heard and experienced from many sources is that the flow transducer should be as follows:

Carburetor setup: Between engine driven fuel pump and carb, above the level of the carb.

Fuel injected: Between the fuel servo and flow divider.
 
I put mine between the electric boost pump and the Engine mechanical pump. I get artificially high readings when the electric pump is on, so mine is NOT a good setup. Readings with electric pump on are about 1.5 of readings with pump off.
However I am never more than 1/2 gallon off at fillup.
 
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