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Bill Reining
Joined: 13 Aug 2007
Posts: 13
Location: Oakland, California
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 Posted: Tue Nov 27, 2007 10:41 am Post subject: How to avoid vapor lock: building tips |
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My son and RV-10 building partner, Jon, was researching a possible autogas STC for his Citabria 7KCAB at the Petersen website (http://www.autofuelstc.com). Petersen does lots of autogas STCs for various aircraft and engines. Anyway, buried in the site was this guidance, which I thought might be of interest to the RV-10 community:
"Homebuilders can improve the fuel system of an airplane under construction in a number of ways to reduce the likelihood of vapor lock. NASA vents incorporated into the vent system help provide positive pressure. Fuel pumps should be installed in the fuel tanks, or as close to the fuel tank as possible, and should be of the maximum pressure and flow rating allowable for the carb. Any 90° fittings should be replaced with 45° fittings, or tubing with very smooth gradual bends. Fittings should be made as tight as possible to prevent air from entering the line. Lines should be secured to prevent vibration & harmonics. Fuel lines in the engine compartment should be insulated to prevent heat from soaking through to the fuel. Fuel lines should not be located in close proximity to hot spots in the engine compartment.
Composite materials used for the construction of some homebuilts may react negatively when they come in contact with fuel. The early Vari-eze homebuilts had a tendance for the spar to come apart after fuel tank leaks dribbled fuel onto the spar. Homebuilders should contact the kit manufacturer to see if material used throughout the airplane is compatible with the type of fuel you will be using and to receive other recommendations."
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Bill (and Jon) Reining
40514 |
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AV8ORJWC
Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"
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| Posted: Wed Nov 28, 2007 10:53 am Post subject: How to avoid vapor lock: building tips |
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The president of the Oregon Pilots Association now former president and former editor of Kitplanes magazine (Dave Martin)reported that the Oregon legislature just passed a mandate for 10% ethanol MOGAS which invalidates the Peterson STC. The EAA sent a formal letter of immediate concern for pilots from other states who refuel in Orygun.
A post on another matronics site mentioned many such states moving towards E85. Before anyone plans on MOGAS, there needs to be someone listing the difficulties of such a decision. The Peterson/EAA STC was for older engines of lower compression and are not of the same variant as the D4A5.
I thing Rhonda and Monty might chime in on what costs would be incurred to do a dyno of an RV-10, Lycoming D4A5 running 50% 100LL Avgas and 50% E85 Mogas like the Rotax do. Anyone game to volunteer their engine? This is no light topic so bring it on.
John Cox
40600
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recapen(at)earthlink.net
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| Posted: Wed Nov 28, 2007 11:22 am Post subject: How to avoid vapor lock: building tips |
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I believe that the systems attached to the engine (injection mostly) are compatible with alcohol containing fuels.
What about out aluminum fuel tanks?
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| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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