Today's Message Index:
----------------------
1. 07:20 AM - Angle for Useable Fuel and Flow Check (DaveG601XL)
2. 07:32 AM - Re: Angle for Useable Fuel and Flow Check (Jim Hoak)
3. 08:20 AM - Re: Angle for Useable Fuel and Flow Check (T. Graziano)
Message 1
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| Subject: | Angle for Useable Fuel and Flow Check |
I am to the point in my final assembly where I would like to demonstrate the useable
fuel quantity and fuel flow checks. Per the FAA guidelines, they suggest
"5 degrees above the highest anticipated climb angle." I e-mailed ZAC for their
suggested angle at which to perform this test. I got back a disappointing
catch-22 like non-answer. They said the highest angle I am likely to see is
the power on stall angle. "Which you will have to find in your flight testing."
That was the entire answer, not even a suggestion considering that I cannot
do one before the other. Thanks for nothing.
Does anybody who is flying an XL with a Jabiru 3300 have any insight on an appropriate
angle to use for this test? At least until I can fly and determine my
own results.
Thanks,
--------
David Gallagher
601 XL, working on final assembly.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=184356#184356
Message 2
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| Subject: | Re: Angle for Useable Fuel and Flow Check |
David,
I don't have an exact angle to suggest for the fuel system flow check, but I
do highly recommend you do it. Let's hope a XL owner can give you a real
number. As a EAA Tech Counselor I urge every builder I work with to do this
check. It can be a life saver. My guess is to get the nose up to about 25
degrees.
I suggest actually running the engine at take-off power ( not just a fuel
flow check into a container ) for at least a minute or two with minimum fuel
in the tanks with the selector in each position. Just be carefull how you do
this. Don't want anyone to get hurt.
Jim Hoak - 601 HD
----- Original Message -----
From: "DaveG601XL" <david.m.gallagher@ge.com>
Sent: Thursday, May 22, 2008 9:19 AM
Subject: Zenith601-List: Angle for Useable Fuel and Flow Check
> <david.m.gallagher@ge.com>
>
> I am to the point in my final assembly where I would like to demonstrate
> the useable fuel quantity and fuel flow checks. Per the FAA guidelines,
> they suggest "5 degrees above the highest anticipated climb angle." I
> e-mailed ZAC for their suggested angle at which to perform this test. I
> got back a disappointing catch-22 like non-answer. They said the highest
> angle I am likely to see is the power on stall angle. "Which you will have
> to find in your flight testing." That was the entire answer, not even a
> suggestion considering that I cannot do one before the other. Thanks for
> nothing.
>
> Does anybody who is flying an XL with a Jabiru 3300 have any insight on an
> appropriate angle to use for this test? At least until I can fly and
> determine my own results.
>
> Thanks,
>
> --------
> David Gallagher
> 601 XL, working on final assembly.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=184356#184356
>
>
>
Message 3
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| Subject: | Re: Angle for Useable Fuel and Flow Check |
Dave,
If you hold the tail on the ground, it should be suffice, in my opinion. I
believe any difference between this and a higher angle would be minimal. I
have never heard of any problems with the XL/Jab fuel system design.
With the Jab 3300 you have a very high nose attitude at full power at
stall - in fact on my XL/Jab I can never get it to break before my CHTs go
to redline; the airplane just hangs in a stall shudder and I keep the wings
level with rudder.
Also, I have run my tanks dry during Phase I testing to see what would
happen and to check restart of the Jab. On my XL the engine just suddenly
quits, and the engine windmills. Restarts are a non event. I hit the boost
pump, change tanks to one with fuel, and within a few seconds the engine is
again purring.
I believe you will really enjoy flying the XL/Jab. Watch your CHTs.
Tony Graziano
XL/Jab N493TG; 378 hrs
----- Original Message -----
From: "DaveG601XL" <david.m.gallagher@ge.com>
Sent: Thursday, May 22, 2008 9:19 AM
Subject: Zenith601-List: Angle for Useable Fuel and Flow Check
> <david.m.gallagher@ge.com>
>
> I am to the point in my final assembly where I would like to demonstrate
> the useable fuel quantity and fuel flow checks. Per the FAA guidelines,
> they suggest "5 degrees above the highest anticipated climb angle." I
> e-mailed ZAC for their suggested angle at which to perform this test. I
> got back a disappointing catch-22 like non-answer. They said the highest
> angle I am likely to see is the power on stall angle. "Which you will have
> to find in your flight testing." That was the entire answer, not even a
> suggestion considering that I cannot do one before the other. Thanks for
> nothing.
>
> Does anybody who is flying an XL with a Jabiru 3300 have any insight on an
> appropriate angle to use for this test? At least until I can fly and
> determine my own results.
>
> Thanks,
>
> --------
> David Gallagher
> 601 XL, working on final assembly.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=184356#184356
>
>
>
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