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01-18-2011, 07:44 PM
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Join Date: Oct 2008
Location: Utah
Posts: 8,151
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I kept my mouth zipped for 10 months  Now I can unzip - I saw work on the tanks during my stay at RV Hotel  Impressive.
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01-18-2011, 09:40 PM
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Join Date: Jan 2011
Location: Hillsboro,OR
Posts: 136
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In wing oil
I'm interested in how you did this?
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01-18-2011, 10:03 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Welcome to VAF!!!!
Brenden, welcome to VAF
Good to have you on board.
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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01-18-2011, 10:45 PM
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Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,867
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Quote:
Originally Posted by rocketbob
...if you have any sort of leak in the cap won't that prevent you from drawing from the outboard tanks?
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That's part of the reason I'm going with a pump in addition to a suction pickup (two separate pickups) on each outboard tank. I plan to operate just like Pat, pump on for takeoff or any time it looks like the outboards aren't feeding. I'll have capacative senders in all 4 tanks.
With the clipped HRII wing, I could only fit 16 gal in each outboard for a total of 74. Hoping for 5hr/1000nm range with a healthy reserve.
__________________
Miles (VAF# 1238, Paid up as of 2018)
RV-7 TU 904KM (reserved)
Wings Fitted and Finish Kit on site
Construction Log
Picasa: Empennage Album, Wings Album, Fuselage Album
1955 Cessna 170B flying since 1982
'To get something you never had, you have to do something you never did.' -Unk.
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01-18-2011, 11:38 PM
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Join Date: Nov 2007
Location: Reno, NV
Posts: 2,125
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Quote:
Originally Posted by Kahuna
Per plane this averages ~4 gallons depending on position. Guys with 3 gallon tanks had to upgrade to 5.
Guys with 5 gallon tanks modulate to the best of their ability so as to not run out for the big show ending.
A 6 gallon tank would meet the all demands of the pilots for our performance.
Funny thing is. The guy who needs the least, me cause im out front the most, has the most to burn (13 gallons). Strange.
Having the most smoke available does have its advantages. One being that many of our shows we do a circle the jumpers, then a missing man, then the routine, no landing for more oil. The missing man -3 burns a ton of smoke. Guess who gets to be the missing man due to excessive smoke oil availibility? 
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Great gouge, thanks! Looks like upgrade time...3.5 to 5.5 (or a custom job for more). Extra smoke and extra HP for the MM -3...mind if I follow your lead!
Quote:
Originally Posted by MeAndMyToys
I'm interested in how you did this?
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Me too (looked on your web site for it...still trying not to pester...will the questions never end?  ) Smell...pun intended...like another thread?
Cheers,
Bob
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01-19-2011, 05:34 AM
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Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,589
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hum
This is very interesting to me. More fuel, longer range fits in my planning for my 9A, but with cruise speeds under 200, you still have to out about every 600 miles, right?
IF you can figure out how to cruise at 250-300 with that range---I'd really be interested in that--oh, with a similiar fuel burn. I know---we cant have everything. might be a neat discussion--
Tom
Quote:
Originally Posted by Kahuna
Range in this configuration will be 1500nm with vfr reserves. Im working on getting it to the ~2300nm range.
Weight is TBD with further testing.
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__________________
Tom Swearengen, TS Flightlines LLC, AS Flightlines
Joint Venture with Aircraft Specialty
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC
www.tsflightlines.com, www.asflightlines.com
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01-19-2011, 09:20 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Red flag time
Quote:
Originally Posted by TS Flightlines
More fuel, longer range fits in my planning for my 9A-----
Tom
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The 9 is a totally different wing, IIRC. It is not designed (stressed??) for aerobatics----and is longer.
What worked on an 8 may not be appropriate for a 9.
I would be sure to do a bit of informational digging before making a quad tank setup in your plane.
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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01-19-2011, 09:26 AM
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Join Date: Oct 2006
Location: Brooksville, FL
Posts: 356
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Quote:
Originally Posted by Kahuna
I did it this way. Build the tanks. Set the outboard tanks up on the wing spar. ALign the outboard tank with the outboard skin. Use the holes in the tank skin as guides for drilling into the spar. Let the holes fall where they may. Its essentially what I did on my first set of wings for the 2 outboard bays. This will leave a nice ~4" gap between the tanks for plumbing. Only the inboard tanks have indicators. This makes fuel flow accuracy more important than before.
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Plumbing. In my installation, the engine only gets fuel from the inboard tanks. Further, the inboard tanks only vent to the outboard tanks. If there is fuel in the outboard tanks, it will get pulled into the inboard. Only the outboard tank is vented to the outside air. Testing has proved this to work fine. My outboard tank vent, vents at the fuse in the normal vans location. Note: Since a very sealed tank is now mission critical to the success of this senerio, the Vans usher caps are junk and had to go. I went with some double sealed locking caps from ACS. I must have caps that will NOT leak or I wont get the fuel pulled into the mains.
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Interesting.. I built tanks into the wing tips (like Jon Johanson's) getting about 9.5 gals per side. But I like your solution better.
I put a direct gravity feed between the tip tank and the main. Vented it the same way you did (tip tank back to fuselage vent). I did use van's caps successfully, but found that I needed to keep them lubed with "Fuel Lube" to keep them air tight, especially the lower tank.
I fly a lot of IFR, so also put a alternate tip tank vent in the end of the wing by using a Andair check valve just in case the main vent gets blocked.
Have you had any issues with the long vent line back to the fuselage. I've found that if the tank vents fuel into the vent line, it results in quite a suction necessary to draw fuel out of the main tank. The tip check valve helps that situation out a lot....
__________________
Fred Stucklen
wstucklen1@cox.net
RV-7A N924RV Flying (1825 Hrs & counting)
RV-6A N926RV 875 Hrs (Sold)
RV-6A N925RV 2008 Hrs (Sold)
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01-19-2011, 10:26 AM
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Join Date: Jul 2006
Location: Flower Mound, Texas
Posts: 122
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Quad Tanks
Hello Kahuna,
What a great idea! I am fascinated by what you did. How about some pictures?
I'd like to see how you handled the skin gap between the tanks and the location of the tie down ring mount.
I guess from your description that the inter-tank plumbing feeds from the bottom of the outboard tank to the top in the inboard tank. Is that correct?
I'm sitting here looking at my partly completed -7 wings thinking that this is something I might want to do. More info, please!
__________________
Jim Ellis
RV-7A, N23VC, Slider, Garmin G3X Touch Panel,
Barrett Precision Engines Superior XPIO-360,
Dual P-Mags, Airflow Performance FM200A,
Classic Aero Designs Interior,
GLO Custom Aircraft Paint,
Flying
RV-9A N155T, Sold
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01-19-2011, 11:32 AM
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Join Date: Dec 2004
Location: Gold Hill, NC25
Posts: 2,400
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Quote:
Originally Posted by Jim Ellis
Hello Kahuna,
What a great idea! I am fascinated by what you did. How about some pictures?
I'd like to see how you handled the skin gap between the tanks and the location of the tie down ring mount.
I guess from your description that the inter-tank plumbing feeds from the bottom of the outboard tank to the top in the inboard tank. Is that correct?
I'm sitting here looking at my partly completed -7 wings thinking that this is something I might want to do. More info, please!
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Wing tie down remained unchanged.
Few other pics here.
__________________
Kahuna
6A, S8 ,
Gold Hill, NC25
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