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Angle for Useable Fuel and Flow Check

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DaveG601XL

Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh

Posted: Thu May 22, 2008 6:19 am Post 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 performing this test with the aircraft set to a deck angle of "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,

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_________________
David Gallagher
Cincinnati, OH area

planejim(at)bellsouth.net
Guest

Posted: Thu May 22, 2008 6:32 am Post subject: 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



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tonyplane(at)bellsouth.ne
Guest

Posted: Thu May 22, 2008 7:20 am Post subject: 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

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