Today's Message Index:
----------------------
1. 02:15 AM - Boiling fuel due to underpressure? (Remi Guerner)
2. 03:11 AM - Re: Pete Clark Test Pilot Report G-YURO (David Joyce)
3. 04:02 AM - Re: Aileron setup (Graham Singleton)
4. 09:58 AM - Re: Boiling fuel due to underpressure? ()
5. 10:05 AM - Rudder Lock (Choperpaul)
6. 11:15 AM - Re: Rudder Lock (Jeff B)
7. 11:59 AM - Re: Pete Clark Test Pilot Report G-YURO (Tim Ward)
8. 03:29 PM - Re: Rudder Lock (Richard Iddon)
9. 04:53 PM - Re: Fuel filters (rampil)
Message 1
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Subject: | Boiling fuel due to underpressure? |
Frans,
Sorry to confirm you are wrong!
The fuel pump is unable to supply 120 liters per hour and 15 PSI at the
same time. The pump performance curve suplied by Rotax (914 Install
Manual, paragraph 14.4.1, page 50) shows that the pump is able to
deliver only about 90 liters per hour at 15 PSI (relative pressure).
Should you need 1,5 bars/22 PSI (relative) then the flow would have to
be restricted to 55 liters per hour. Should you need 1,75 bars/26 PSI
(relative) then the flow would have to be restricted to 20 liters per
hour. 120 liters per hour can be delivered only with zero out put
pressure. Again this comes from the pump performance figures provided by
Rotax and this behaviour could be verified with any similar fuel pump.
In my previous example, assuming you are running on one pump, the flow
through the pump and the filter would be 96 liters per hour. The engine
would use about 30 liters per hour. The remaining 66 liters would go
back to the tank. Again, the conclusion is that the fuel flow through
the pump and filter is reduced when you push the power lever. I am
pretty sure you will be able to confirm this whenever you are ready to
run your engine. I would be curious to know your measured figures.
Remi
"You are flying at full power at 16000 feet, ISA conditions. According
to the Rotax
Manuals, the air box pressure (absolute pressure) is 1,2 bars. The fuel
pressure
at the carbs must be 0.25 bars above airbox pressure, that is 1,45 bars
absolute. Ambient pressure at 16000ft is 0,53 bars, so the fuel pressure
must
be 0,92 bars above ambient. The fuel pressure regulator adjusts the flow
back
to the tank so that the pump is able to supply the required pressure.
[/quote:6ba7d7472f]
I don't agree with that. The fuel pump delivers 120 liters, with 15 psi
or something
like that. The fuel pressure regulator simply opens a valve when the
pressure
exceeds a limit, so the excess fuel flows back to the tank.
If the engine consumes more, the pressure drops a bit, so the valve
closes a bit,
and less fuel is flowing back to the tank. Let's say that 96 liters flow
back
(your example). This means that the engine is using 24 liters per hour.
The
flow through the filter is 96 + 24 liters, still 120 liters per hour.
The ratio
may differ, but the total remains constant.
You can also see it like this: the pressure regulator does not
communicate with
the pump, so the pump does not know what is going on and always delivers
120
liters per hour, regardless whether the engine is running at full power,
or not
even running at all.
Anyway, as soon as I have the installation ready I can tell you for
sure, as I
have a fuel flow sensor in series with both the feed line and the return
line.
I will tell you how much flows through the filter with various power
settings.
Frans"
Message 2
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Subject: | Re: Pete Clark Test Pilot Report G-YURO |
Tim, I have copies of the CAFE report on Kim Prout's N111EU, the Flyer
report on G-YURO by Miles McCullum, Peter Underhill's report on G-YURO and
various reports on the XS! Any of those any good to you?
Regards, David Joyce, G-XSDJ
----- Original Message -----
From: "Tim Ward" <ward.t@xtra.co.nz>
Sent: Monday, October 13, 2008 7:33 PM
Subject: Europa-List: Pete Clark Test Pilot Report G-YURO
>
> Hi all,
> Does anybody have a copy of Pete Clark's report on the test flying of the
> number 1 Europa Classic G-YURO?
> It use to be on the old company website alas now not on the new company
> website.
> It could be on the Europa Club website however I am not a member.
> Cheers,
> Tim
> Europa Classic 292 ZK-TIM
> 180 hours
>
>
> Tim Ward
> 12 Waiwetu Street
> Fendalton,
> Christchurch
> NEW ZEALAND
> PH 0064 3 3515166
> MOB 021 0640221
> ward.t@xtra.co.nz
>
>
>
Message 3
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Subject: | Re: Aileron setup |
Frans Veldman wrote:
>
> Thanks for all the advice. I will try again, but the desciptions look like what
I have been doing so far. The points is, if I start with the QD's vertical,
the link rods adjusted to the upper limit, I somehow end up with about 26 degrees
down travel for the starboard aileron. As soon as I start correcting this
by adjusting the link rod, it messes up all the other parameters, such as upper
aileron limit, neutral setting etc and whatever I try, I can't get it right
anymore.
> The weather doesn't look promising today, so I can't get the airplane outside
to try again.
>
> BTW, I use the Europa factory sold digital level, and measure compared against
the wing tip, i.e. neutral is the aileron parallel to the wing tip.
>
> Frans
>
Frans
you must set the aileron upper limit first with the link rod, go for 24
deg, as Bud said. Then set everything else.
Graham
Message 4
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Subject: | Re: Boiling fuel due to underpressure? |
For what its worth, I fooled with 914 fuel system on bench.
Gilles was kind enough to put on his site:
http://contrails.free.fr/engine_914_fuel_syst_test_en.php
I commented on bubbling.
Note if the drain on Andair 375 is opened just a tiny little bit, bubbling
goes out of control and yuo can hear pumps injesting air.
Ron Parigoris
Message 5
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Hi Guys, before i try to reinvent the wheel, does anyone know how to stop the rudder
from moving about in the wind please?
Visit - www.EuropaOwners.org
Message 6
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I use a pair of 3/4" PVC tubing on the passenger side. They have "T"'s
cut out to accommodate the "T" shape in the peddles. Simple, light and
cheap.
Jeff - Baby Blue
Choperpaul wrote:
>
> Hi Guys, before i try to reinvent the wheel, does anyone know how to stop the
rudder from moving about in the wind please?
>
>
>
>
>
>
> Visit - www.EuropaOwners.org
>
>
>
>
>
>
>
>
>
> ------------------------------------------------------------------------
>
>
> Checked by AVG - http://www.avg.com
>
Message 7
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Subject: | Re: Pete Clark Test Pilot Report G-YURO |
Hi David,
We managed to get Pete Clarks report on G-YURO the prototype #1 so many
thanks for your offer.
Cheers,
Tim
Tim Ward
12 Waiwetu Street
Fendalton,
Christchurch
NEW ZEALAND
PH 0064 3 3515166
MOB 021 0640221
ward.t@xtra.co.nz
----- Original Message -----
From: "David Joyce" <davidjoyce@doctors.org.uk>
Sent: Tuesday, October 14, 2008 11:11 PM
Subject: Re: Europa-List: Pete Clark Test Pilot Report G-YURO
> <davidjoyce@doctors.org.uk>
>
> Tim, I have copies of the CAFE report on Kim Prout's N111EU, the Flyer
> report on G-YURO by Miles McCullum, Peter Underhill's report on G-YURO and
> various reports on the XS! Any of those any good to you?
> Regards, David Joyce, G-XSDJ
> ----- Original Message -----
> From: "Tim Ward" <ward.t@xtra.co.nz>
> To: <europa-list@matronics.com>
> Sent: Monday, October 13, 2008 7:33 PM
> Subject: Europa-List: Pete Clark Test Pilot Report G-YURO
>
>
>>
>> Hi all,
>> Does anybody have a copy of Pete Clark's report on the test flying of the
>> number 1 Europa Classic G-YURO?
>> It use to be on the old company website alas now not on the new company
>> website.
>> It could be on the Europa Club website however I am not a member.
>> Cheers,
>> Tim
>> Europa Classic 292 ZK-TIM
>> 180 hours
>>
>>
>> Tim Ward
>> 12 Waiwetu Street
>> Fendalton,
>> Christchurch
>> NEW ZEALAND
>> PH 0064 3 3515166
>> MOB 021 0640221
>> ward.t@xtra.co.nz
>>
>>
>>
>>
>
>
>
Message 8
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|
I made a 'T' bar from plastic waste pipe, about 1.25 in diameter. I
trimmed the ends of the cross bar so they sit over the rudder pedals and
glued a short vertical piece of pipe on the end of the 'leg'. I cut
half this away so it sits against the stick and I hold it in place with
a bungee cord which I fixed under the panel. The bungee just loops over
the stick. It not only stops the rudder from banging about but
stabilises the ailerons and tailpane also. In very strong winds it can
shake loose but for most conditions it works a treat. Took me less than
an hour to make, weighs only a few ounces and cost very little.
Richard Iddon G-RIXS
<pilot.whittingham@googlemail.com>
Hi Guys, before i try to reinvent the wheel, does anyone know how to
stop the rudder from moving about in the wind please?
Message 9
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Subject: | Re: Fuel filters |
Hi Remi
Thanks for the info about the french accidents.
It seems what's needed is a simple test of pressure drop across
the filter in a 914 aircraft with the flow rate that interested you
for that engine (I only have a 912s).
Of course, one also has to control the contaminants in the fuel as
any filter will clog eventually
Ira
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 8820#208820
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