Hi Clive
The k factor of 17030 you are using for your single transducer setup is roughly
53 percent of the standard Flowscan k factor of 32000.
On the strength of that I have just set the initial k factor of new my red cube
transducer to 36000 (53 percent of the standard red cube k factor of 68000).
I switched on the boost pump and guess what - the indicated fuel flow is
4ltrs/hr,
exactly the same as yours.
Many thanks for posting this information, it will give me a head start when I
get
my Europa back in the air. My k factor will, of course, need further fine tuning
but it is good to start off with an initial k factor that is broadly correct.
Regards
John
G-JHKP mono
(Rotax 912ULS with single red cube transducer fuel flow measurement)
On 15 Mar 2013, at 21:13, "Clives email" <clive.maf@googlemail.com> wrote:
>
> Hi Svein,
>
> Thanks for your reply. I regret that the 9lit/hr indicated figure I gave in
> my last email is actually wrong - 9lit/hr is indicated with the 912ULS
> running at idle and with boost pump 'on'. I just checked the boost
> pump-only flow rate (my a/c is in the garage next door for the winter), and
> it reads just over 4Lit/hr with a K factor of 17030 - which I think all
> tallies rather well with your comments about 'spot' flow rates vs totalised
> flow rates and the 9 lit/hr figures you have found. My K factor will be
> specific to the sensor/Stratomaster setup of course, other combinations may
> easily have different K factors.
>
> Regards,
>
>
> Clive.
>
> -----Original Message-----
> From: owner-europa-list-server@matronics.com
> [mailto:owner-europa-list-server@matronics.com] On Behalf Of Sidsel & Svein
> Johnsen
> Sent: 15 March 2013 18:19
> To: europa-list@matronics.com
> Subject: SV: Europa-List: SV: Re: SV: fuel flow and return line status
>
> --> <sidsel.svein@oslo.online.no>
>
> Hello Clive,
>
>> Thinking more about the single fuel flow setup - would you agree that
>> another way of checking the restrictor is not blocked, is simply to
> monitor
>> that there IS fuel flow without the engine running but with the boost
>> pump running? I get around 9L/hr.
>>
>> Assuming the float chambers are full and there are no external leaks,
>> not sure where else fuel can go if it is not being consumed by a
>> running
> engine. . .
>>
>> Clive
>>
>
> Yes, I do agree. This is effectively the same as I will do with my
> two-sender set-up : momentarily switch off the feed (total) flow sender and
> switch the return flow sender to the feed input as a single sender.
>
> Your 9L/hr return flow is close to what I measured when I, too, had a system
> with only one sender - I got approx. 10L/hr. However, if you have adjusted
> the k-factor to get a reasonably good totalizer function (i.e. adjusted the
> k-factor so that the displayed fuel consumed on an average flight is
> approximately correct), your actual return flow is higher than the displayed
> flow, of course.
>
> Regards,
> Svein
>
>
>
>
>
>
>
>
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>
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