Today's Message Index:
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1. 06:15 PM - Stick Switches Protector? (rparigoris)
2. 06:25 PM - Re: Stick Switches Protector? (Area-51)
3. 06:58 PM - Re: Stick Switches Protector? (rparigoris)
4. 07:05 PM - What did you do with your Europa this week - 18/11/22 (Area-51)
5. 07:38 PM - Re: What did you do with your Europa this week - 18/11/22 (rparigoris)
6. 09:32 PM - Re: What did you do with your Europa this week - 18/11/22 (Area-51)
7. 09:58 PM - Re: Stick Switches Protector? (Bob Harrison)
Message 1
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| Subject: | Stick Switches Protector? |
Hi Group
We have Ray Allen switches on the top of sticks that are vulnerable to getting
hurt when working on aeroplane.
Has anyone made up a lightweight, EZ on and off protector?
Thx.
Ron P.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=508925#508925
Message 2
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| Subject: | Re: Stick Switches Protector? |
No, something better.
Decided to bypass this situation all together and produce a better tailored 3D
printed solution.
All three stick diameter sizes to suit.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=508926#508926
Attachments:
http://forums.matronics.com//files/477a43af_aed1_4830_ac4d_f63305bfeaad_101.jpeg
Message 3
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| Subject: | Re: Stick Switches Protector? |
Hi Area 51
Nice job.
We already have things fabricated and wired though:
http://www.europaowners.org/gallery2/v/Begin-06-2003/album258/album284/DSCN8418.JPG.html
http://www.europaowners.org/gallery2/v/Begin-06-2003/album258/album284/Stick_4.jpg.html
Ron P.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=508927#508927
Message 4
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| Subject: | What did you do with your Europa this week - 18/11/22 |
This week instead of driving three hours through crap traffic, 181 got hauled out
and taken into the sky to do the journey in just 75 minutes; without traffic
or idiot drivers to deal with.
The journey back was exciting; turning east on departure to cross the bay at 132kt
gs, ASI read 80!!!
Then had "washing machine" to contend with, midday thermal activity, mechanical
turbulence off mountain ranges to the west, 2500' CTA ceiling, 1700' undulating
terrain floor, -500fpm sink, 30C air temperature.... It was 15 minutes of "not
fun"... then headed straight back to happy air at the coast once over the
ranges and clear of CTA... Pulled up weathX at the field; robot said 90deg xwind
gusting 15kt; interesting... got to the field and wind sock said 25kt sea breeze
straight down 05; brought 181 in and had a relaxing cup of tea... All the
practical training got used...
Today confirmed 50 years of engine tuning skills with the new FART box (Fuel Air
Ratio Tester).. What did it reveal??? It said that after 50 years of tuning
engines by ear and sense of vibration the skills are still functioning perfectly!
The FART confirmed idle mixtures were set spot on at 14.5 Stoichiometric...
FART also confirmed main jets were set spot on at 14.5 also... What else did
FART reveal?? FART revealed that adjusting the idle mixtures on the Bing carburettor
only has affect at 1500rpm and below... FART also revealed that altering
the main jet only has affect from 3600rpm upwards... What does this all mean??
It means basically all useful work the 912 does is on the main jet only!!
181 never flies at rpm below 3600; final is flown at 3600 with power pulled back
to idle just before round out... between 3600 and 1500 the intermediate needle
mixture is on the rich side of 13 down to 11; but this is all ground taxi
rpm... What else was confirmed by today's first ever FART experience?? It confirmed
fuel injection on the 912 is not required.
What else was learned today? That a good FART box can let anybody FART anywhere!!!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=508928#508928
Attachments:
http://forums.matronics.com//files/4a2f9ed9_53e0_462a_a7d3_b8ad31e6cff8_104.jpeg
http://forums.matronics.com//files/72faffb0_5c7f_4e98_b8a2_85a37432f4b8_300.jpeg
Message 5
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| Subject: | Re: What did you do with your Europa this week - 18/11/22 |
Hi Area 51
What is your FART smelling for? Carbon Monoxide? Or is it a Oxygen sensor?
For Rotax 914, especially if you have modified the intake 914 (ie intercooler)
they recommend that you don't run lean when you dial up War emergency power (115%).
They want you to do this by using a Carbon Monoxide tester and checking
each cylinder at a time through the EGT port. They want a minimum amount of Carbon
Monoxide. So idea is to find leanest cylinder and make sure you are making
enough Carbon monoxide. The older style 914 airboxes were more critical to the
adjustment of the higher than airbox pressure air used to enrichen by plumbing
to float bowls. You adjust so leanest cylinder is rich enough. Sorry, but
haven't messed with it on rotax yet. Triumph motorcycles adjust carbon monoxide
using that tester before they leave factory.
i installed a oxygen bung and sensor on my 914. I have a fuel air ratio display
to let me know how I am doing. I installed a mixture control to allow leaning.
I'm leaking carb float bowl pressure via needle valve to cross balance tube.
Will verify things with Carbon Monoxide tester and figure leanest cylinder under
various throttle settings. I'm slight rich on main jets, jet needle clips.
My philosophy is to throw a little more fuel on the fire to keep things cool
when generating BTUs. Now, the 94 tends to have a few cylinders run rich at taxi
speeds, I plan on running really lean. Above 50% power, will know leanest cylinder
at various power settings and lean accordingly. On 914 there is an enriching
solenoid that plumbs float bowls to airbox, or higher than airbox pressure.
I installed a switch that will activate the solenoid by pilot. I used a
schottky diode to isolate power from being backfed into the TCU. Idea is if anything
went wrong with lean plumbing, "rich switch" takes it out of circuit.
I too am a long time tuning guy, very satisfying to get things running the way
you want them.
Ron P.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=508929#508929
Message 6
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| Subject: | Re: What did you do with your Europa this week - 18/11/22 |
Hi Ron,
The FART is smelling Oxygen.. whether its CO1 or CO2 is irrelevant to me; i just
want the FART to tell me how much Oxygen it is smelling; if the FART says 14.5
then i know its a happy FART. As long as my FART is happy i am happy also...
Whether the mixture is observed to be slightly rich during taxi, couldn't care
less; its 5-10 minutes of mild operational demand time.
You cannot leak boost pressure back through the float needles on a 914 snd expect
to keep moving; firstly that would intimate that your boost pressure is higher
than your fuel pressure; secondly you would run out of fuel on one or both
carburettors.
The float chambers need to remain equalised to plenum pressure; if they are leaking
air pressure the engine will run lean; hence all the Rotax instructions;
and yes you tune to the leanest cylinder always; using an infrared pistol tester
is good enough to indicate this.
Remember you have a lot less room to get it wrong with turbo charging; things go
crunch a lot quicker with less warning. If you want to run really lean above
50% power as you mention then firstly you are already going to be at 30% power;
so you will give it more throttle; then you will experience more heat, and
its all down hill from this point.
Its like performing an engine out glide approach; the airframe has its optimum
airspeed for endurance and distance... 14.5 Stoich is that optimum Oxygen content
for "all" petrol engines under "all" operating conditions, for maximum thermal
efficiency, end of story...
There are numerous ways to diagnose and monitor engine tune; for me its pretty
much field experience knowing the different harmonic tones generated by different
engine cylinder formations under full and partial load; they indicate air/mixture,
spark timing, or mechanical imbalances. The FART is purely a final quality
assurance confirmation for me befor signing off on maintenance service.
There are endless test points that can be used to monitor an engine; Oil Pressure
and Head Temp are the most vital, the rest are nice to haves but not essential
and are just early warning meters for the less experienced. If you want perfect
analogue economy as good as any fuel injection device then you want to know
your manifold pressure and exhaust oxygen content, and maybe add as a cross
reference exhaust temperature probe, however to be as accurate as the O2 sensor
the EGT probe really should be placed right at the valve throat; so for a
912/914 that's 4 probes.
For a 914 the best point to probe EGT is upstream at the impeller, this area between
the head and impeller is by default a fairly constant temp environment and
will rise and fall according to boost load and is a cross reference point for
oil and head temperature meters, the other point i would probe is inlet air
temp post intercooler, but personally i would still really on my O2 readings
as a final checkpoint.
All this above will give the operator the insight that the engine, mixture wise,
can or cannot run any better than is being indicated.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=508930#508930
Message 7
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| Subject: | Re: Stick Switches Protector? |
> On 18 November 2022 at 02:15 rparigoris <rparigor@hotmail.com> wrote:
> I made a flip top protector for G-PTAG after Andy Draper had his clip board or
chart self operate the trim switch . Used to work very well . You would need
to refer to Martin Coffin who now has G-PTAG for photo if he still has it working
in place .
regards Bob Harrison.
>
>
> Hi Group
>
> We have Ray Allen switches on the top of sticks that are vulnerable to getting
hurt when working on aeroplane.
>
> Has anyone made up a lightweight, EZ on and off protector?
>
> Thx.
> Ron P.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=508925#508925
>
>
>
>
>
>
>
>
>
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