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fuel line sizing

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larry(at)ncproto.com
Guest

Posted: Fri Oct 12, 2007 9:31 am Post subject: fuel line sizing

Does anyone have any insight on sizing the fuel lines ??  I know some Rocket Drivers are flying behind some pumped up 540’s (and I have one coming also) and at a projected fuel flow rate of 30 gpm to 40 gpm in climbout; it just seems (thumb-in-the-air-engineering) that a -6 (3/8”) fuel line is a bit small.  Any worries here ???  Don (at) AFP ….. I’ll bet you have a good idea J  

   

Larry E. James  

Bellevue, WA  

Super Decathlon  

Rocket  

   

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Hr2pilot(at)aol.com
Guest

Posted: Fri Oct 12, 2007 9:43 am Post subject: fuel line sizing

I run 3/8" lines on the Rocket III with no problems . The highest fuel flow  I have seen was 41GPH.

  

 John  Harmon

D & J Harmon Co., Inc.

2201 Coy Avenue

Bakersfield, CA  93307

661-396-3570

661-396-3574 FAX

web: www.harmonso2generators.com





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larry(at)ncproto.com
Guest

Posted: Mon Oct 15, 2007 8:17 am Post subject: fuel line sizing

Thanks John, Pretty much sums it up J  

   

Larry E. James  

Bellevue, WA  

Super Decathlon  

Rocket  

   

[quote]>I run 3/8" lines on the Rocket III with no problems . The highest fuel flow I have seen was >>41GPH.  

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Don

Joined: 18 Jan 2006
Posts: 13

Posted: Tue Oct 16, 2007 2:50 pm Post subject: Re: fuel line sizing

Here's what we use for engineering data.



Suction side of pumps:

3/8" tubing #6     51 GPH max.  No 90 degree fittings.  We like to limit this to 35-40 GPH for most applications.



1/2" tubing #8    89 GPH.



Don at Airflow.

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GStone57(at)comcast.net
Guest

Posted: Tue Oct 16, 2007 3:14 pm Post subject: fuel line sizing

Don,

What about the 90 degree fitting that comes on the braided lines?? Are they

any better?? I have to turn 90, what is the best way?

Thanks Greg



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Don

Joined: 18 Jan 2006
Posts: 13

Posted: Wed Oct 17, 2007 5:40 am Post subject: Re: fuel line sizing

What we call "full flow fittings" use a curved tube to make the bend on the hose end.  Use this hose end fitting with a straight fitting in the part to make the bends when ever possible.  This will reduce flow loss rather than using a 90 degree fitting which is drilled with a 90 degree intersection.   On the pressure side of the engine driven fuel pump 90 degree fittings are not a problem.



I like to use full flow hose ends on all the oil cooler hoses and straight fittings in the engine case and oil cooler.  Even though the oil is under pressure the stuff is higher viscosity, so there may be more flow loss using 90 degree fittings for this application.  I may be just paranoid about this, but that's how we do installations here. 



Don at Airflow

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