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11-01-2013, 07:00 AM
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Join Date: Sep 2007
Location: Melbourne Australia
Posts: 76
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External Tanks
Trial fitting my new tanks. Extra 35Ltrs per tank. Not sure of the performance penalty but I think they look hot anyway. Only takes a few minutes to remove them for normal operations.
[IMG]  [/IMG]
Mick
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11-01-2013, 07:08 AM
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Join Date: May 2012
Location: Ga
Posts: 662
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Hard points
Ive often thought about those previous "a"model folks who have converted to tail wheel and how they could use the tricycle hard points to mount something external like a fuel tank or baggage compartment.
Your tanks look pretty real. I wonder what would happen if you accidently got close to a TFR here? The security over liberty mindset may not present a pleasant outcome.
By the way, they look cool and thinks for sharing!
__________________
Craig
RV-3 Sold
RV-4 Sold
RV-6a Sold
RV-9 IO-360 CS, Built and Flying
Aerostar 600A, Family Hotrod
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11-01-2013, 08:33 AM
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Join Date: Oct 2012
Location: Tellico Plains, TN
Posts: 12
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I like them. I want some, too.
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Lawrence Harris
Tellico Plains, TN
RV-7 emp. done, working on wings
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11-01-2013, 09:08 AM
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Join Date: Jan 2010
Location: Denver, CO
Posts: 1,967
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Friggin' awesome!
I want to see a picture from the front, showing the overall plane with both external tanks, please.
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11-01-2013, 09:43 AM
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Join Date: Jul 2012
Location: Western US
Posts: 98
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Now that is cool looking!
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11-01-2013, 09:46 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Proceed with caution. That much mass on what looks like a ~12" arm may cause a significant change in wing torsional frequency.
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Dan Horton
RV-8 SS
Barrett IO-390
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11-01-2013, 09:48 AM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,145
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Quote:
Originally Posted by DanH
Proceed with caution. That much mass on what looks like a ~12" arm may cause a significant change in wing torsional frequency.
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Just like wingtip tanks - each mod needs to be considered individually for those unintended consequences. Having said that, it's a cool looking mod!
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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11-01-2013, 09:50 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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They need fins on them.
Very cool! How did you plumb them into your fuel system and how did you support the tank? Do you think this can be done as a retrofit to a flying aircraft?
Here is a picture of an RV-4 with external baggage pods. I would think they could be modified into fuel tanks rather easily.

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Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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11-01-2013, 04:35 PM
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Join Date: Sep 2007
Location: Melbourne Australia
Posts: 76
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The center of gravity of the tank is just forward of the wing spar, about 1/4". The rear attachment is more for stability. This is just a test tank that has no plumbing installed and will be used for load testing only.
I will be plumbing the external tanks to the main tanks and transferring fuel with an electric fuel pump. My thoughts at the moment are that a line from the highest point on the main tank will return to the external tank so if the transfer pump is left on it will not over fill the mains and cause the fuel to be dumped out the vent lines. I would rather use the fuel from the external tanks first and this would allow me to run the fuel pumps until they are dry.
Mick
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