Bud and all,
Respectfully, there is absolutely nothing superior about a rubber hose
versus a conductive teflon hose EXCEPT for some cost savings. A properly
assembled and tested Conductive PTFE hose assembly will be lighter,
stronger, have far superior hose end connections and will outlast any
rubber hose on the market. To say that a rubber hose is superior is akin
to touting the attributes of a Ford Pinto as a rationalization for why it
is the best car in existence.
The reasons for this are too numerous to list here. We build thousands of
hoses annually for the experimental aircraft community, to include Reno
Racers, Competition Aerobatic aircraft teams, and OEM manufacturers.
Everyone needs to make their own decisions on what is an acceptable level
of safety/performance versus cost.
One of the incredible things about experimental aircraft is not having to
utilize certified parts. This has allowed a whole aftermarket of extremely
high quality products that provide an equal or higher level of safety than
certified products at a much more reasonable cost structure. Our market
niche happens to be fuel and oil systems for experimental aircraft.
We have a lot more information, including fabrication videos at
http://aircraftspecialty.com/howwemake.html
If anyone is interested in having a more in depth discussion about hoses,
please feel free to reach out to us. We are aircraft builders and love
working with other builders to find perfect solutions for their projects.
Have a great evening and have fun building.
Steve
On Sun, Jun 2, 2019 at 5:10 PM Bud Yerly <budyerly@msn.com> wrote:
> Will and others,
>
>
> If you go to :https/ www.customflightcreations.com I have the fuel and
> other hose recommendations.
>
>
> In the US, Gates, Continental, Goodyear or any of the reputable hose
> manufacturers manufacture =9Cbarrier=9D fuel line that meet t
he EPA Recommended
> Emissions Requirements are fine. R7 is old line and has been replaced wi
th
> R14 which has a higher permeation resistance, and now is pretty much the
> standard. The Emissions standards are printed on the hose normally (mari
ne
> hose is an exception) and can be identified easily by looking at the hose
.
> It is just rubber hose, lined with a butyl or viton inner liner . Normal
> carburated line is perfectly fine rated to 2-3 bar or about 30 to 50 PSI.
> It is cheaper also than the fuel injected line $4 vs $12. The difference
> is more nylon webbing sewn into the rubber hose. The liner keeps the fue
l
> smell to virtually zero and as a result, the ethanol or fuel additives wi
ll
> not harm the hose and it stays remarkably supple over time.
>
>
> Researching fuel line is not enjoyable. Manufactures do not give enough
> info, so simply go by the R rating.
>
> Stay away from Teflon and PTFE hoses as they get brittle and take a set
> overtime and what should be a lifetime hose ends up being a significant
> leak hazard if the hose is simply moved during maintenance or rerouted.
>
>
> Below is an excerpt from my own N12AY Parts List rather than the on line
> less detailed version.
>
>
> Best Regards,
>
> Bud Yerly
>
>
> *Hoses:*
>
> *Recommended Fuel Hose: * 5/16=9D R14 or similar odor resistant
> silicone/butyl/viton lined carburetor hose.
>
> However: Parker Superflex Fuel hose is R7 equivalent and is OK for
> ethanol/diesel/biodiesel etc.
>
> From Aircraft Spruce SUPER FLEX FUEL LINE HOSE 5/16"/7mm single braid
> 100PSI working pressure, 0.562=9DID 14.3mm OD, 2" min bend radius,
ACS P/N:
> 05-07223 $3.50
>
> I still prefer auto or marine hose R14 or J1527 15gm/m2/day from auto or
> marine dealers.
>
>
> *Recommended Rotax Engine Coolant Hose suppliers: * Are either Rotax
> supplied rubber 17mm hoses rubber and one bent silicone hose, or I now us
e
> Silicone heater hose of better quality but with issues on clamping as
> different spring clamp may be needed or buy proper silicone hose clamps.
> Do not use Breeze or similar worm clamps as it cuts the silicone. Silico
ne
> hose should not need heat reflective sleeve as it is highly heat resistan
t,
> but protection is still recommended:
>
>
> *Alternate cooling hose: * 5/8=9D Silicone hose from Amazon Hose or
> Aircraft Spruce such as:
>
>
> HPS 4-Ply 5/8" (16mm) 1 Foot Long Blue Silicone Hose or
> Flex Tech www.siliconehose.com
>
> 5/8" ID x 1 Foot Length. Max Temperature Rating: 350F. HPS High Temp 4-pl
y
> Reinforced Blue
>
> ACS : Silicone Hose 5/8"ID, 0.95"OD, .220Wall, ACS P/N
> 05-00661 $9.65
>
> Silicone Tube Coupler Hose meet or exceed SAEJ20 standard
>
> Fits 17 mm Rotax fittings rather tight and can use the existing worm
> clamps but not the spring clamps.
>
>
> Better to order from the UK or similar 17mm line. Dayco is a manufacture
r
> but it is double silicone and slightly fatter than standard.
>
>
> *Europa Specific Shaped hose:* 1=9D shaped hoses are bought direct
ly from
> Europa. Europa stocks the new silicone hose at a good price. Highly
> recommended. CO5 and CO6 in silicone are about 36UKPounds each.
>
>
> If not available: Consider HPS formed hose like the 180/90/straight hoses
> fittings and a lot of clamps:
>
> 1" (25mm) 1-1/2" $25.00 HTSEC180-100-BLK
> HTSEC180-100-BLUE
>
> HPS 90 degree:
>
> 1" (25mm) 4" 4-Ply $21.32
> HTSEC90-100-BLK HTSEC90-100-BLUE
>
> HPS Straight typical:
>
> 1" (25mm) 1 Foot 5mm 4-Ply Polyester 350F $25.53
> HTST-100-BLK HTST-100-BLUE
>
> Proper Clamps and couplers are available also www.hps-siliconehoses.com
>
>
> *Recommended Oil Lines: *
>
> =C2=BD =9C Parker Push-Lok=C2=AE 836 multipurpose hose delivers hig
h temperature
> performance, up to 302=C2=B0F, and higher working pressures than 821 hose
.
> Approved with crimp or push on fittings and with a distinctive blue cover
> indicating a high temperature rating. Will fit on new 13mm fittings on
> Rotax 912 push on series oil tank fittings but must be heated and is a ha
rd
> fit. Cut off hose only once on.
>
>
> =C2=BD =9C Aeroquip AQP FC332 Push on hose is similar.
>
>
> Alternate: Mil 6000 -40F to +250F: ACS P/N: 6000-8 1/2ID 7/8OD
> 1000 $6.70
>
> I don=99t use these on the 914 due to the proximity to the exhaust
muffler
> heat they do work but you have to inspect more often and cover with
> reflective heat shield listed under heat shield:
>
>
> *Heat shield: *
>
> For lower engine coolant and oil lines use: Thermo-Tec Thermo-Sleeve
> P/N:14015 for 1 to 1.5 inch hoses, and P/N: 14011 for 5/8 to 3/4
=9C
>
>
> *For fire protection of fuel lines and or oil lines:*
>
> Fire Sleeve: Parker / Aeroquip 12 or 10 sized PN FBS2200 I prefer Parker
> Stratoflex as it is more flexible. Aeroquip is very stiff and is poor fo
r
> 2 inch bend radii.
>
> To seal the fuzzy cut ends use either Firewall 2000 or Permatex Red
> Silicone RTV or the new .
>
> Banding is: 10781-4 clamp to secure firesleeve material over the basic
> fabricated hose assembly if desired.
>
>
> *Fuel sight gauge hose/ clear tubing:*
>
> Aircraft Spruce P/N: 05-01063 3/8=9D OD, =C2=BC=9D ID
>
> Aircraft Spruce P/N: # 15-06094 Super Heavy Duty Pulse line 3/8=9D
OD, 1/4
> =9C ID
>
>
> *Brake Line: *
>
> Normally all Matco now: See Landing Gear Below
>
> Brake Line: =C2=BC OD .018 ID line: N Tubing - Natural P/N: 05-01011 ID
Wall:
> 0.035=9D, Burst 960
>
> A/C Spruce: Matco Nylon II Tube 1/4" 06-01133 MSCNNR4/035
> $1.49 Use with Matco Fittings.
>
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows 10
>
>
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