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  #21  
Old 11-17-2019, 08:14 PM
erich weaver's Avatar
erich weaver erich weaver is offline
 
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Quote:
Originally Posted by TS Flightlines View Post
To answer Larry's post, finding conductive teflon hose from an industrial source is tough. Most 'race car' hose suppliers dont use it. Ours, -4 and larger when used for fuel and oil are conductive. Those for brake systems with a clear chafe cover are not-----brake fluid doesnt flow to make the brakes work, its compressed, so it doesnt pick up static electricity. Thus a conductive liner for brakes isnt necessary. High quality suppliers like Earls and Goodridge have excellent components for the builder that wants to do their own assemblies.
So do Earls and Goodridge carry conductive Teflon hose or no?

Thanks,

Erich
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  #22  
Old 11-17-2019, 08:33 PM
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Never heard of conductive teflon hose.

What's it used for? Why?
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  #23  
Old 11-17-2019, 09:03 PM
Aircraft Specialty Aircraft Specialty is offline
 
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Originally Posted by bobnoffs View Post
for me they were much cheaper. how can a brick and mortar business hand you a finished product that costs no more than the ''raw materials''? i am not saying the service isn't worth it, but it costs more.that's the way it works.
Quote:
Originally Posted by JonJay View Post
Buying power..... but you’re probably right.
JonJay- Tom and I buy and manufacture our own components in very high volumes. This allows us to keep control over the quality as well as help keep pricing in line. In addition, we have built a very efficient and high volume shop. We keep our overhead as low as we can by not having a fancy website and doing everything in house that we can.

Regarding hose pricing.... here is an example

-6 hose 90/str with firesleeve.

EARLS SPEEDFLEX


1. Earl's Speedflex conductive teflon hose (Very high quality) - 24" - $12
2. Earls Speed Seal Hose end 90 degree Stainless fitting - $63.02
3. Earls Speed Seal Hose end Straight Stainless fitting - $24.76
4. Milspec AS1072 Firesleeve - 24" approx $22 from Spruce.
5. Firesleeve Bands - about $5 for two of them from Spruce.

1. Total $126.78 for the hose assembly components.


2. ASFlightlines Assembly- -6 with firesleeve 90/str 24" flare to flare - $117.04


3. ASFlightlines Integral Firesleeve Assembly - $134.60

4. Vans Aeroquip Build it yourself Hoses- These are not conductive Teflon, but rubber assemblies. They are also the most expensive of the options.

1. 2 feet of -6 hose $32
2. Right Angle Fitting $71
3. Straight Fitting $30
4. Firesleeve $29
5. Firesleeve bands (Not sold on Vans but about $5 from Spruce)
Total $167

Different configurations and sizes may vary, but when you are comparing the same quality components, our pricing is very competitive with what it would cost to build yourself. With that said, those same hoses can be fabricated for half the cost, but won't be conductive teflon with true stainless ends, milspec firesleeve, etc..... Every one of our assemblies undergoes a hydrostatic pressure test prior to shipment and comes with a 10 year warranty.

There are lots of builders that choose to fabricate on their own for the experience of learning. We fully support that. But for those that want professional hoses fabricated with the highest quality components at a fair price, we will do our best to earn your business.

For those that are interested in how we assemble our hoses....

http://aircraftspecialty.com/howwemake.html

Part 3 of the conductive teflon hose video series shows crimping and pressure testing utilizing a fully automatic CNC crimping machine.

Over the last year Tom and I have made some significant investments in additional equipment and will have some new announcements in the coming months.

If anyone wants to talk about hoses, please give either Tom or I a call. We are both builders, and spend most of our days talking with other builders about custom solutions for their aircraft. It's extremely rewarding to be able to be a small part of so many of your projects. We have a massive database of different aircraft/engine/servo/mag, etc... configurations that we can draw from to help you with your fuel/oil systems. However, if none of our "stock" kits fit, we will help you configure the perfect custom hose setup for your project.
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Last edited by Aircraft Specialty : 11-18-2019 at 08:49 AM. Reason: Updated Aeroquip pricing
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  #24  
Old 11-17-2019, 09:10 PM
Aircraft Specialty Aircraft Specialty is offline
 
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Quote:
Originally Posted by emsvitil View Post
Never heard of conductive teflon hose.

What's it used for? Why?

Ed,

Great question. Teflon material allows you to have a hose that won't degrade over time like rubber lined hoses. This is why it is "on condition" replacement, versus rubber hoses that need to be changed because they get brittle over time and are affected by certain fuel additives, ethanol, etc.

The bigger portion of this is Conductive versus Non conductive Teflon. This is a critical point. When you have a fuel line hose carrying gasoline at a relatively high flow rate, static charges build up. The static charges can arc to the stainless outer braid. Over time this will cause pinholes in the teflon hose and the hose will begin to weep. (Like those garden soaker hoses).

A conductive hose has a layer of carbon impregnated into it that allows this static to dissipate through the fittings and not cause these issues over time.

Take care,

Steve
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  #25  
Old 11-17-2019, 09:16 PM
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johnbright johnbright is offline
 
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Default conductive Teflon

Quote:
Originally Posted by erich weaver View Post
So do Earls and Goodridge carry conductive Teflon hose or no?

Thanks,

Erich
Earls does have conductive Teflon -4 and above. As far as I can tell they do not offer conductive Teflon in -3 size. Perhaps no one makes conductive Teflon hose in -3 size because it is normally for brake lines where there is no flow.
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  #26  
Old 11-17-2019, 09:19 PM
Aircraft Specialty Aircraft Specialty is offline
 
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Quote:
Originally Posted by erich weaver View Post
So do Earls and Goodridge carry conductive Teflon hose or no?

Thanks,

Erich
Erich,

For those builders that are interested in building hoses themselves, Earl's Speedflex is a high quality solution for a conductive Teflon assembly with stainless ends. It won't result in much of a cost savings (It might be more expensive in some situations), but is a great option for those that want the experience of fabricating their own hoses.
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www.aircraftspecialty.com
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Last edited by Aircraft Specialty : 11-17-2019 at 09:22 PM.
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  #27  
Old 11-18-2019, 08:50 AM
Aircraft Specialty Aircraft Specialty is offline
 
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Post #23 above was updated to also include a price comparison of the Vans Aeroquip self fabricated assemblies.
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  #28  
Old 11-18-2019, 03:22 PM
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And advantage of DIY is that tricky hose where you need to trial fit to get the length just right, and get the clocking on angled end-pieces just right (angled pieces on both ends).

I dislike swivel ends because they always seem to eventually get an oil film on them from a leak that's short of a drip.
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  #29  
Old 11-18-2019, 03:34 PM
RVDan RVDan is offline
 
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I purchased my-6A that had been flying about 500 hrs. About 50 hrs later I was climbing out and began to smell fuel. Really smell fuel. Shortly later my feet started to feel wet. Checked under the panel and my fuel line going to the firewall was pissing a stream on my feet. Turned off the electrical boost pump, and the stream stopped. Now got worried that the engine driven pump would be sucking air. Declared a precautionary landing, and got on the ground ok with my shoes and carpet soaked in fuel. I had visions of my legs on fire before landing.
As it turns out, the builder decided to make his own using Earls parts. He misassembled the end fitting, and obviously never pressure tested it.

Flex lines must be pressure tested to pressures not likely available in your shop.
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  #30  
Old 11-18-2019, 04:52 PM
Aircraft Specialty Aircraft Specialty is offline
 
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Quote:
Originally Posted by emsvitil View Post
And advantage of DIY is that tricky hose where you need to trial fit to get the length just right, and get the clocking on angled end-pieces just right (angled pieces on both ends).

I dislike swivel ends because they always seem to eventually get an oil film on them from a leak that's short of a drip.
Ed,

We DO NOT use swivel ends for that exact reason. We warranty the hose assemblies for 10 years, and a swivel end will eventually likely start to leak.

What we do for these clocking or complicated fit issues is to send the customer the raw hose and fittings and let them do a mock up with the actual components. Once they are marked to the exact lengths and clocking, they come back to us for final assembly, pressure testing and shipment.

This is not normally necessary, but for some very critical lengths and clocking, we do utilize this method.

Also, we have master "clocked" hoses for certain setups so that we are able to duplicate it the same every single time. This is for hoses that we utilize often for standard type set ups.

Steve
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