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  #11  
Old 09-24-2017, 10:03 AM
Aircraft Specialty Aircraft Specialty is offline
 
Join Date: Jan 2012
Location: Oconomowoc, WI
Posts: 334
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Quote:
Originally Posted by waterboy2110 View Post
Tom - so the return line (I assume supplied by your group for the kit) does have some "restriction" included in the design? If so, how does it compare to the flow rate of the restrictor that is removed from the factory?

Thanks,
Jim
Jim,

Yes. Our retrofit fuel system does have a restricted return line. There is a difference in the placement, but the orifice restriction size is matched very closely to the restrictor size utilized in the standard kit.

If you would like to see the installation manual it shows both the restrictor as well as how the system is installed in the RV-12.

Here is a link to the kit

http://aircraftspecialty.com/rv-12.html

And here is a link to the install manual

http://aircraftspecialty.com/PDF&#37...l%20111013.pdf


Have a great weekend and let me know if you have any other questions.
Steve
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Aircraft Specialty is Your Source for Custom CNC parts, CNC cut instrument panels and labeling, Teflon fuel/oil hoses, Headsets, and many other items for Experimental Aircraft.

aircraftspecialty@gmail.com

www.aircraftspecialty.com

Last edited by Aircraft Specialty : 09-24-2017 at 10:28 AM.
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  #12  
Old 09-25-2017, 06:44 AM
TS Flightlines TS Flightlines is offline
 
Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,113
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Jim---factory is .014, ours is .015.

Tom
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Tom Swearengen, TS Flightlines LLC
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC
www.tsflightlines.com
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  #13  
Old 09-25-2017, 08:55 AM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 7,717
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Quote:
Originally Posted by TS Flightlines View Post

In looking for this SB, I found an interesting one--SI-912-008r1, which (paraphrase) refers to fuel pressure indication problems. Check for the proper tolerances of the crush washers around the banjo bolts. It only affects the pressure INDICATION on the gauge, NOT the actual supply pressure.
(The TS Flightlines/Aircraft Specialty retrofit kit uses AN hardware and not banjo bolts and is not affected by this.)
The standard Van's supplied installation is not effected by this either (the attachment of the fuel pressure sensor is done in a totally different way) so whether you have the standard installation or the Flightlines kit they will perform the same.
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Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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  #14  
Old 03-27-2018, 09:50 AM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 7,717
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Coming full circle back to this....

There has been discussion in the past regarding differences in the orifice restrictor diameter for the return hos on the VA-216 kit supplied hose assembly, and the specification listed in the Rotax install manual.

The orifice used by Van's in the VA-216 hose assembly is a standard off the shelf part supplied by Rotax.
It has a restrictor orifice that measures .020-.021" diam.
The install manual specifies that it be .014" diam.

It took a while, but I have finally been able to confirm (all the way back to engineering in Austria) that the specification in the install manual is an error and will be revised.
The Rotax factory supplied part with the .020 orifice diam. is the desired size, and will produce the desired amount of return flow.

Knowing this I need to amend my previous post.....
Quote:
Originally Posted by rvbuilder2002 View Post
The standard Van's supplied installation is not effected by this either (the attachment of the fuel pressure sensor is done in a totally different way) so whether you have the standard installation or the Flightlines kit they will perform the same.
I believe the Flightlines kit uses a .014 restrictor as specified in the install manual. That being the case the return flow will be lower so the performance in that aspect will not be the same.
__________________
Any opinions expressed in this message are my own and not necessarily those of my employer.

Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")

Last edited by rvbuilder2002 : 03-27-2018 at 09:57 AM.
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  #15  
Old 03-27-2018, 03:28 PM
Aircraft Specialty Aircraft Specialty is offline
 
Join Date: Jan 2012
Location: Oconomowoc, WI
Posts: 334
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Quote:
Originally Posted by rvbuilder2002 View Post
Coming full circle back to this....

There has been discussion in the past regarding differences in the orifice restrictor diameter for the return hos on the VA-216 kit supplied hose assembly, and the specification listed in the Rotax install manual.

The orifice used by Van's in the VA-216 hose assembly is a standard off the shelf part supplied by Rotax.
It has a restrictor orifice that measures .020-.021" diam.
The install manual specifies that it be .014" diam.

It took a while, but I have finally been able to confirm (all the way back to engineering in Austria) that the specification in the install manual is an error and will be revised.
The Rotax factory supplied part with the .020 orifice diam. is the desired size, and will produce the desired amount of return flow.

Knowing this I need to amend my previous post.....

I believe the Flightlines kit uses a .014 restrictor as specified in the install manual. That being the case the return flow will be lower so the performance in that aspect will not be the same.
First off... Thank you Scott for checking into this further. I am glad that Rotax is fixing the published documentation so that it is accurate.

The ASFlightlines kit currently has a .015 orifice restrictor, which is .001" larger than the one that has been listed in the official Rotax documentation (and continues to be listed) since we first started doing Rotax hose packages. We will modify our package to utilize a .020 orifice restrictor to match the revised documentation that Rotax is planning on releasing.

We have done real world testing on an aircraft that had the .020-.021 restrictor installed and then changed over to the .015 restrictor. There was a slight difference in fuel flow and a minimal/almost negligible difference in fuel pressure.

We have also tested in real world application the difference in restrictor locations between our kit and the stock Vans kit. Location does not appear to have any appreciable difference on fuel pressures.

In short, the reasons that our kit appears to fix the low fuel pressures that SOME RV-12s are having does NOT appear to be due to the slightly smaller orifice restrictor or its location.

We are currently working on assembling a "modification package" which we will provide (***free of charge-see below***) to any customers utilizing our kit. It will consist of a #76 drill bit to enlarge the orifice from .015" to .020". We will offer this to anyone who has EVER purchased a kit from us and chooses to modify their restrictor.

We have modified our website with an order page already. If you go to the front page, it can be found under the "Manuals/Service Tab". We anticipate we will have the drill bits in stock no later than 5-1-2018 (hopefully sooner) and will enable online ordering as soon as we have them.

As always, thank you all so much for allowing us to earn your business.

Steve and Tom

*****FREE***** - Our payment provider doesn't allow $0.00 transactions for security reasons. So, the kit will be sold for $0.01.
__________________
Aircraft Specialty is Your Source for Custom CNC parts, CNC cut instrument panels and labeling, Teflon fuel/oil hoses, Headsets, and many other items for Experimental Aircraft.

aircraftspecialty@gmail.com

www.aircraftspecialty.com

Last edited by Aircraft Specialty : 03-27-2018 at 03:37 PM.
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