Today's Message Index:
----------------------
1. 05:34 AM - Airmaster AP420 on Europa 3300 (Carl Meek)
2. 12:16 PM - Fuel Pressure (BobbyPaulk@comcast.net)
3. 01:37 PM - Re: Fuel Pressure (FLYaDIVE)
4. 02:40 PM - Re: Fuel Pump (FLYaDIVE)
5. 02:58 PM - Re: Airmaster AP420 on Europa 3300 (FLYaDIVE)
Message 1
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| Subject: | Airmaster AP420 on Europa 3300 |
I currently run a Europa with Seisenich fixed wood prop on a Jabiru 3300.
It's a little tight getting out of my 450m strip, I wouldn't want a more
coarse prop.
Cruise is 118kts at Sea Level at 2850rpm
I'm wondering whether to spend the money on the air master prop, but I'm a
novice to CS/VP props. I imagine it will give me better power out of the
strip and a higher cruise and/or lower RPM in cruise.
Does anyone have any thoughts? Is it worth the money? What gains will I
reasonably expect?
Regards,
-Carl.
Message 2
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Many Thanks to Pete, Chuck, and Gerald for all the great info.
I usually use the boost pump on take off but for some reason that morning I did
not. I was not in a hurry and was the only one flying off the field at the time.
Engine was cool. I guess I need a check list for my check list.
I am using 92 Oct. Non Ethanol Marine fuel and an automotive clear cleanable 5
micron fuel filter with replaceable elements. It shows every piece of grit or
trash and I have cleaned it only once in 3 yrs and it did not need it then. The
filter is between my pump and carb so if the filter clogs the pressure would
go up instead if down. I will double check my gascolator though. It is in the
belly and is before the boost and engine driven pumps. If the screen is partially
gunked up it would drop the pressure. Draining the quick drain only showed
a few tiny grit particles.
I am going to set my low fuel pressure alarm down and monitor very closely.
Will post any thing unusual.
Thanks again
Bobby ( age 74 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 285 Needle Jet
Status - Flying 153 hrs.
Message 3
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| Subject: | Re: Fuel Pressure |
Bobby:
Isn't the fuel pump part of your fuel supply system and doesn't it
also deserve a clean fuel supply? So why not put the fuel filter as the
first line of defense in the entire system. The only thing you will have
to change your thought process - Clogged Fuel Filter = LOW or NO Fuel
Pressure.
One thing I have learned about human nature is: When it comes to gauges -
NO INDICATION gets one attention. Higher indications require an additional
thinking process which is not normal and confusing and requires MORE Time
in deciphering. Was that pressure 5 PSI or 8 PSI, doesn't pressure
increase when fluid is cold, was that were the needle was at start up,
where was the needle on the last flight, I'm looking at the gauge from an
angle- does that mean it is lower than it really is? Too many questions.
No needle movement = You have a problem = LAND.
Barry
On Tue, Jun 19, 2012 at 3:15 PM, <BobbyPaulk@comcast.net> wrote:
>
>
> Many Thanks to Pete, Chuck, and Gerald for all the great info.
> I usually use the boost pump on take off but for some reason that morning
> I did not. I was not in a hurry and was the only one flying off the field
> at the time. Engine was cool. I guess I need a check list for my check
> list.
> I am using 92 Oct. Non Ethanol Marine fuel and an automotive clear
> cleanable 5 micron fuel filter with replaceable elements. It shows every
> piece of grit or trash and I have cleaned it only once in 3 yrs and it did
> not need it then. The filter is between my pump and carb so if the filter
> clogs the pressure would go up instead if down. I will double check my
> gascolator though. It is in the belly and is before the boost and engine
> driven pumps. If the screen is partially gunked up it would drop the
> pressure. Draining the quick drain only showed a few tiny grit particles.
>
> I am going to set my low fuel pressure alarm down and monitor very closely.
>
> Will post any thing unusual.
>
> Thanks again
>
> Bobby ( age 74 )
> Zodiac 601 XL "B"
> Jabiru 3300 S/N 1141
> Sensenich 64" x 51" Prop
> Bing Carb 260 Main & 285 Needle Jet
> Status - Flying 153 hrs.
>
>
> *
>
> *
>
>
Message 4
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Bobby:
At full throttle the carb float valve will be open more and longer and as
your plumbing experience denotes - high flow equals lower pressure.
The boost pump should be checked for operation at start-up, during Mag
check, and ON for Takeoff and Landing. Once stabilized in cruse the pump
should be turned off.
Life expectancy of a fuel pump - Well which fuel pump do you have? The
Facet fuel pump will last for years and years. I use one at work for
pumping diesel in a test apparatus and it has performed flawless for
thousands of hours.
Your fuel pressure - Sure sounds acceptable to me. I would not concern
myself with 0.1 and 0.2 PSI of change. The question that comes to my mind
is the accuracy of the gauge, can it be trusted for such a small change and
is it temperature compensating? The minimum safe pressure should be called
out by the engine manufacture as well as the carb manufacture. Example: A
low wing plane with both a electric fuel pump and an engine driven pump
only requires 0.5 PSI as Min. Yet the gauge always shows about 4 to 6 PSI.
What is important is the fuel line size. Volume flow is more important
than pressure. If the engine is being leaned by a restriction in fuel flow
you will never get the power you want. This is a case of Bigger is Better.
Take care you O'l Honey Dipper.
Barry
On Mon, Jun 18, 2012 at 9:28 AM, <BobbyPaulk@comcast.net> wrote:
> List
> I have the Dynon engine monitor in my 601 with the Low Fuel pressure set
> to 2.0 psi. This past Sat on take off roll the pressure went to 1.8 and the
> alarm sounded. I hit the boost pump and elected to keep going when the
> pressure came up to 2.3 Psi. At altitude (1500' ) I turned off the boost
> pump after reducing power and the pressure stabilized at 2.4 psi. I decide
> to experiment with throttle settings and at full power the pressure again
> went to 1.8 psi. This happened 3 or 4 times with the same result. Normally
> the pressure stays at 2.3 or 2.4 at full throttle. Taxiing out the pressure
> is stable at 3.0. As an old plumber I understand that when the flow
> increases the pressure will drop somewhat. My question is two fold. Is this
> a sign of the pump failing soon?? How long should the fuel pump last (
> hours )? Also what would be a minimum safe pressure at take off power?
>
> I would like to hear from Pete at Jabiru USA on this issue.
> Thank you
>
> Bobby ( age 74 )
> Zodiac 601 XL "B"
> Jabiru 3300 S/N 1141
> Sensenich 64" x 51" Prop
> Bing Carb 260 Main & 285 Needle Jet
> Status - Flying 153 hrs.
>
>
> *
>
> *
>
>
Message 5
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| Subject: | Re: Airmaster AP420 on Europa 3300 |
Carl:
That could be a tight strip. 450 M = 1476 Ft. Have you worked out Vr
Rotation Speed and Vrto = Rejected TakeOff speed? You did not say which
Europa you have. But, isn't the Jabiru a heavier engine than the Rotax?
And they give a takeoff roll of 590 Ft = 180 M which is 1/3 your runway
length. That is 40% of your runway IF you start at the very end (not
counting the length of your plane).
AND - AND - That is on a STANDARD TEMP DAY. Runways get shorter on hot
days. So, YES, I would highly consider a CS prop. And your cruse speed
would go up also. Learning to fly a CS prop is only a few hours of
training and a lot of reading.
Barry
On Tue, Jun 19, 2012 at 8:32 AM, Carl Meek <carlmeek@gmail.com> wrote:
>
> I currently run a Europa with Seisenich fixed wood prop on a Jabiru 3300.
>
> It's a little tight getting out of my 450m strip, I wouldn't want a more
> coarse prop.
> Cruise is 118kts at Sea Level at 2850rpm
>
> I'm wondering whether to spend the money on the air master prop, but I'm a
> novice to CS/VP props. I imagine it will give me better power out of the
> strip and a higher cruise and/or lower RPM in cruise.
>
> Does anyone have any thoughts? Is it worth the money? What gains will I
> reasonably expect?
>
> Regards,
> -Carl.
>
>
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