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  #1  
Old 05-25-2017, 09:24 PM
Aircraft Specialty Aircraft Specialty is offline
 
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Default Prefabricated Fuel Lines

How much interest would there be in prefab rigid fuel lines for the RV-12? There is no set time frame on this, and there would be some hurdles to overcome. It may be possible to offer rigid fuel lines that drop right into place. Some would be pre flared, and some would need one flare put on after installation.

Any thoughts from current RV-12 builders? Or any thoughts from those who already built lines and would have liked to have this option available?

If we did something like this, it would be similar to the lines we prefab for the rv-14. They would be bent with a CNC tubing bender and come ready to install.

Thanks in advance for the input.
Steve
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Old 05-25-2017, 09:34 PM
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Phantom30 Phantom30 is offline
 
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Quote:
Originally Posted by Aircraft Specialty View Post
How much interest would there be in prefab rigid fuel lines for the RV-12? There is no set time frame on this, and there would be some hurdles to overcome. It may be possible to offer rigid fuel lines that drop right into place. Some would be pre flared, and some would need one flare put on after installation.

Any thoughts from current RV-12 builders? Or any thoughts from those who already built lines and would have liked to have this option available?

If we did something like this, it would be similar to the lines we prefab for the rv-14. They would be bent with a CNC tubing bender and come ready to install.

Thanks in advance for the input.
Steve
This would be especially nice from aux fuel pump back to fuel tank (with provision for tank drain and maybe a plugged 1/4" female for pressure sensor) for fuel level...the type Belite sells.
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Old 05-25-2017, 10:53 PM
rv9builder rv9builder is offline
 
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Originally Posted by Aircraft Specialty View Post
It may be possible to offer rigid fuel lines that drop right into place. Some would be pre flared, and some would need one flare put on after installation.
I think more builders would be interested if you offered a full set of all the rigid lines for the RV-12 pre-made so you wouldn't need to buy a tube bender and flaring tool.
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Old 05-26-2017, 04:43 AM
RFSchaller RFSchaller is offline
 
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I like the idea of providing a drain under the tank. That would be worth the hassle of a retrofit.
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Old 05-26-2017, 05:44 AM
Aircraft Specialty Aircraft Specialty is offline
 
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Originally Posted by rv9builder View Post
I think more builders would be interested if you offered a full set of all the rigid lines for the RV-12 pre-made so you wouldn't need to buy a tube bender and flaring tool.
Mark,

I agree. However it is not physically possible in the rv-12 to have prefab lines with both flares done for every hose. The line from the valve to transducer is an example. It passes through a grommet and won't fit through the hole if both ends are pre flared. Other lines, such as from the transducer to the firewall and the tank to the pump can be pre flared on both sides.

The tubes which would require one flare to be done by the builder would be pre built, pre bent and ready to slide in place. After sliding in place, one flare would need to be made and then it would be tightened down. It would turn those tubes into a single flare event.

The bends would be made on a CNC tubing Bender and accurate within about .010 of an inch. Preliminary testing with a few lines has shown 100% repeatability and a very simple installation.

If we ended up clearing some of the logistical hurdles of this, it may be possible to have a "floating" tool that the purchase of this package would include for rental for a few days. It could move around from builder to builder.

A package like this would be something we would want to discuss with vans for Elsa reasons. (EAB would be no issue at all) However, it would have a positive effect in that it would guaranty that all critical fuel system components would fit perfectly.

Just some thoughts
Steve
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Old 05-26-2017, 06:08 AM
TS Flightlines TS Flightlines is offline
 
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This is one of the great things about having a plane under construction where you can put eyes on the target and really tweek things. Fortunately, Steve and Bob are building a 12 and can test fit everything right there, and NOT have to use USPS! LOL. Wish every project was like that.

Seems there are some edge distance issues with some of the bulkheads where the tubing passes through, same area as the brake lines. Steve and I have talked about this alot.

Tom
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Old 05-26-2017, 08:38 PM
waterboy2110 waterboy2110 is offline
 
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The RV12 may be very close to the 51% rule limit. Buying prefab parts could put you over. Just something to consider - especially for those who adhere strictly to the ELSA aspect.
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Old 05-26-2017, 10:49 PM
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KALEWIS KALEWIS is offline
 
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Quote:
Originally Posted by waterboy2110 View Post
The RV12 may be very close to the 51% rule limit. Buying prefab parts could put you over. Just something to consider - especially for those who adhere strictly to the ELSA aspect.
There is not a 51% rule for ELSA
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  #9  
Old 05-30-2017, 08:08 PM
waterboy2110 waterboy2110 is offline
 
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Quote:
Originally Posted by KALEWIS View Post
There is not a 51% rule for ELSA
Yes - I remember reading that when I first started building. Been a while.
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Last edited by waterboy2110 : 05-30-2017 at 08:44 PM.
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  #10  
Old 05-30-2017, 09:09 PM
sf3543 sf3543 is offline
 
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Default FYI

Rotax has a service instruction, SI-912-022, which is a cancellation of the five year replacement requirement for fuel hoses, for a lot of the 912 engines, since they came from the factory with teflon hoses.
Although it doesn't address the oil and coolant hoses, it is worth looking at and could save a lot of time and money.
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