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10-09-2018, 09:37 PM
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Join Date: Sep 2008
Location: Christchurch, New Zealand
Posts: 187
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Page 337 in "27 Years of the RVator" has some info on putting fuel in the wing tips.
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10-10-2018, 05:15 AM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,626
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I've used Hotel Whiskey tanks in both of my 10's and the 7, and have installed them in other customer's airplanes as well. Be patient. I'm sure they will get back to you. It is a good product, tried and proven.
Vic
__________________
 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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10-10-2018, 07:22 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,652
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Quote:
Originally Posted by F1R
It has been done many times over the years by various builders. You might have do some forum searches to find what you are looking for.
Several Harmon Rockets have been made with wing tip fuel tanks.(Before the F1's came along with larger main tanks as standard) Those tips are the same air foil /wing tip profile as the 4, 6 ,7 and 8 wing. You might check with John Harmon in Bakersfield CA for photos and contacts that have done it. Most often personally designed and fabricated. Some have a recessed fuel filler cap inside a hinge door similar to the oil inspection door on the engine cowl. There are lots of different solutions.
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A other popular option from John is bigger tanks. He sells new skins for extended tanks to get you about 58 gallons total- a bit more if you reverse the end ribs. Ive looked at a variety of options for more fuel and bigger tanks keeps winning as the most reliable way to go in the long run. My Rocket will be so modified eventually.
__________________
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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10-10-2018, 07:38 AM
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Join Date: Sep 2009
Location: Wichita, KS
Posts: 557
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Having read a lot of these ?extra fuel? threads and still being undecided on whether I wanted to incorporate extra tip tanks or LE tanks or just a temp tank in the baggage compartment, I contacted Andair directly and ordered this:
The extra positions can be capped (and labeled INOP).
I think it was an extra $40 or so, but gives me a lot of flexibility.
I really like that I won?t have to affect the standard fuel system.

__________________
Andrew Z.
Engineering Flight Test Pilot/Engineer, CFI-A, CFII, ATP
RV-7 in work (See my build log.)
Empennage...Done (except rebuilding the rudder.)
Wings...Halfway complete.
2018 Dues Paid
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10-10-2018, 08:33 PM
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Join Date: Jul 2008
Location: Santa Rosa, CA
Posts: 580
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26 gallon tanks on my RV6
I wanted a little extra range so I got some 6' tank skins from John Harmon (don't know if he makes them anymore) I then cut them back so I had one extra bay.
I did several structural changes to the spar and to the top wing skins to accommodate the extra weight. Has worked perfect for 1300 hours.
Steve
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10-10-2018, 09:00 PM
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Join Date: Sep 2009
Location: St. Louis, MO
Posts: 1,788
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I just installed the hotel whisky Er tanks in my completed 10. I did so without removing the main tanks. It was not an easy task, but it can be done. I have used them now on several trips. I really wish I had installed them when I built the plane. I did make a slight modification to the transfer system. I added a ?T? in the transfer line and a 2psi pressure switch to confirm that fuel is indeed flowing into the main tanks. I did not feel relying solely on the fuel gauges to confirm the transfer was a reliable solution.
__________________
Bill Peyton
RV-10 - 1125 hrs
N37CP
First Flight Oct 2012
Aviation Partners, LLC
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10-10-2018, 10:42 PM
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Join Date: Oct 2012
Location: LA, California
Posts: 323
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I put one of those baggage compartment smoke oil tanks in my 6 for an additional 7 1/2 gallons. I have a pump under the floorboard to move the fuel to a wing tank as soon as I make room for it.
Ed Holyoke
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10-11-2018, 07:23 AM
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Join Date: May 2006
Location: Pocahontas MS
Posts: 3,884
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Romanov,
Couple of thoughts. Some have mentioned just building bigger tanks. I like that idea, if the plane is not aerobatic (or you don't intend to do acro), but... If you plan on acro, there'd be no way to keep fuel weight confined to the design location. That affects spin characteristics, makes it more difficult to manage quantity, etc.
Several of us who are building 2 seat RVs have simply (ha ha) wet a few bays of the outboard leading edge to add capacity. This is probably the lightest way to do it. I think that all the parts for a pair of 13 gallon tanks weighed about 2 lbs (plus fuel line, valving, etc). Plumbing has been done multiple ways. If you bring the aux tank lines to the fuel selector in the cockpit, you can keep the fuel delivery system almost completely stock. Not a small consideration, since many homebuilt accidents are related to fuel delivery issues.
FWIW,
Charlie
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10-11-2018, 07:41 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,652
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Quote:
Originally Posted by rv7charlie
Romanov,
Couple of thoughts. Some have mentioned just building bigger tanks. I like that idea, if the plane is not aerobatic (or you don't intend to do acro), but... If you plan on acro, there'd be no way to keep fuel weight confined to the design location. That affects spin characteristics, makes it more difficult to manage quantity, etc.
Several of us who are building 2 seat RVs have simply (ha ha) wet a few bays of the outboard leading edge to add capacity. This is probably the lightest way to do it. I think that all the parts for a pair of 13 gallon tanks weighed about 2 lbs (plus fuel line, valving, etc). Plumbing has been done multiple ways. If you bring the aux tank lines to the fuel selector in the cockpit, you can keep the fuel delivery system almost completely stock. Not a small consideration, since many homebuilt accidents are related to fuel delivery issues.
FWIW,
Charlie
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Not sure what your pro/con analysis is suggesting here. Building a larger tank a few bays towards the tip is less overall weight than "wetting" a few bays AT the tip, and certainly results in a lower MMOI. The bigger tank also has zero changes to the supply plumbing, which is better than "almost completely stock".
Adding bays to a fuel tank design has some drawbacks, but from a systems integration and weight perspective its about the best way to go.
__________________
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
______________
Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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10-11-2018, 08:34 AM
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Join Date: May 2006
Location: Pocahontas MS
Posts: 3,884
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My point was, that if it's an acro-capable a/c, I want to keep it as close to 'stock' configuration as I can for acro. By keeping the aux fuel in separate tanks, with minimum achievable weight gain to make the tanks, I'd hope to preserve acro ability (with empty aux tanks) and still have the option of extra range and/or tankerage.
Everything's a compromise; I accept the compromise of an extra position on the fuel selector, to keep acro capability.
For non-acro planes, I like the idea of just making the tanks bigger, as I said in the 1st paragraph of my earlier post.
Does that help?
Last edited by rv7charlie : 10-11-2018 at 08:37 AM.
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