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  #1  
Old 04-12-2019, 11:35 AM
Draker's Avatar
Draker Draker is offline
 
Join Date: Jun 2016
Location: Livermore, CA
Posts: 699
Default Rubber grommets for fuel line routing

For the the nose dragger + flop-tube configuration, your 3/8" fuel line needs to route through three separate 1-inch holes, in addition to the snap bushings near the valve:

A: Steel landing gear mount
B: Gear attach web + Fuselage side skin
C: F-796 fuel tank attach bracket



Van's drawing only calls out a rubber grommet for the "B" pass-through. Is there any benefit or need to grommet the other two pass-throughs? I'm not sure I like the idea of a fuel tube just sitting there suspended inside these holes unsupported, but if there's no possibility of rubbing/chafing, then I suppose grommets would be unnecessary. What is the prevailing wisdom here?
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Livermore, CA
https://stiletto.smugmug.com/RV7
Donated 12/31/2021
RV-7A (N12VD): Finishing final tasks for airworthiness

Last edited by Draker : 06-16-2019 at 09:41 AM.
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  #2  
Old 04-12-2019, 11:45 AM
TS Flightlines TS Flightlines is offline
 
Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 3,085
Default

Even though we do ours alittle differently, if you make the tubes correct they wont hit, or contact the structure. McMaster Carr has a good selection of grommets as well as Spruce.

Tom
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Joint Venture with Aircraft Specialty
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  #3  
Old 04-13-2019, 09:27 AM
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Snowflake Snowflake is offline
 
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Location: Sidney, BC, Canada
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As Tom says... The holes are sized such that you would need to bend something before the lines would hit anything. The reason for the grommet at B is probably as much for sealing airflow between the cabin and the wing root cavity as it is to support the line.
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1996 RV-6 "Tweety" C-FRBP (formerly N196RV)
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Old 04-17-2019, 11:11 PM
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Draker Draker is offline
 
Join Date: Jun 2016
Location: Livermore, CA
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Thanks for the thoughts. Looks like I won't worry about supporting the tubes here. Although I'm not sure I buy the "airflow sealing" aspect, what with the huge holes for the aileron pushrods right next door under the seats!
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Livermore, CA
https://stiletto.smugmug.com/RV7
Donated 12/31/2021
RV-7A (N12VD): Finishing final tasks for airworthiness
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  #5  
Old 04-18-2019, 06:58 AM
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Raymo Raymo is offline
 
Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,339
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Quote:
Originally Posted by Draker View Post
Although I'm not sure I buy the "airflow sealing" aspect, what with the huge holes for the aileron pushrods right next door under the seats!
Talk to Abbie at FlightLine Interiors. They make a nice boot to seal the aileron tubes. You'll also need to seal the wing root, though.
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RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
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