REFLECTOR: Flowscan plumming

Wed Mar 16 11:45:03 CDT 2011

I just originally know about the need to keep the flow straight going in to
the sensor, and to keep the sensor level (why exactly, I am not sure) but to
keep the rotation so that the wires are up was a new one to me, but Flowscan
said that it was important for accuracy- as far as I know they have a vaned
rotor in there that floats in the fuel and breaks an IR beam as it moves
giving the count- sort of like the system on the old wheeled computer mouse-
but in any case, since I had my radiator out and easy(yea) access to the
sensors, I thought I would go ahead and make a bunch of new work for myself-
really, I am going to rely on my sight gauges for fuel amount anyway, but
the instantaneous flow rate info would be useful for tuning during flight...

  _____  

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Andrew Ellzey
Sent: Wednesday, March 16, 2011 10:54 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Flowscan plumming

I suspected you had it all figured out, I just thought I would through this
information out to the group. I can't say that I have seen the subject
discussed before on the reflector. I found it looking for a cheaper sensor.
I did find a better priced sensor at the time, but not a better sensor.

Andy

Sent from my iPhone

On Mar 16, 2011, at 7:27 PM, "Alex Balic" <velocity_pilot at verizon.net>
wrote:

Hey Andy-

I know about the abrupt bends prior to the sensors, but I had them oriented
so that I could bolt them to the firewall (wires facing aft)  flowscan said
that that is not a good orientation for them, and that they need to be
rotated so that the wires face up- of course then I need to make a bracket
to bolt them to, and they do not fit as close to the firewall that way, so I
had to make new lines so that they could sit in the only orientation that
Flowscan claims will give accurate readings and not damage the sensors.

  _____  

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Andrew Ellzey
Sent: Wednesday, March 16, 2011 6:41 AM
To: Velocity Aircraft Owners and Builders list
Subject: REFLECTOR: Flowscan plumming

Alex,

Not to but in, but there is a lot of documentation on the flowscan sensors,
that says that in order to get the most accurate readings, there shouldn't
be any abrupt bends coming in or out of your Flowscan sensor. I found
several STC's and articles showing proper pluming to correct fuel flow
discrepancies. In most cases operators or the STC holder installed specific
lengths of Aeroquip hose on the inlet and outlet of the sensor. The issue is
turbulence of the fuel through the sensor. The use of sweeping bends and
certain lengths of hose in and out of the sensor seems to be the key.

I'm not flying yet, so I haven't been able to test my set up, but I
considered all of this data when making my pluming through my sensor. If an
STC holder using the flowscan sensor had problems, I would say that the data
is valid. My results are yet to be determined.

I have attached two documents for your review if you or anyone else is
interested.

Andy Ellzey

  _____  

From: Alex Balic <velocity_pilot at verizon.net>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Tue, March 15, 2011 7:52:30 PM
Subject: Re: REFLECTOR: tube flare question

I am pretty sure that the tool Matt has allows the screw to turn but the
cone to just push against the tube causing the finish that you see on the
picture, the aviation flare tools lock the cone to the screw, so that it
burnishes the flare as it forms it- I prefer to use the white grease on
mine, but any lube will work I suppose.   I have been out working with the
tool the past couple of days to re-orient the flow sensors on my fuel
system, since Flowscan claims that they will only work properly if
horizontal with the wires facing up -  This is making my fuel routing a bit
more complicated...

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