---------------------------------------------------------- KIS-List Digest Archive --- Total Messages Posted Mon 11/16/09: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:51 AM - Re: Long Range Fuel Tanks (jerzy krasinski) 2. 05:41 AM - Re: Long Range Fuel Tanks (Galin Hernandez) ________________________________ Message 1 _____________________________________ Time: 04:51:58 AM PST US From: jerzy krasinski Subject: Re: KIS-List: Long Range Fuel Tanks I have similar tanks in my plane. - However, II have hard time to understand the cross flow between the tanks. The spar is in the way and drilling the spar does not look good. Did you-make -the cross flow within the lower skin? - In my plane I installed extra pumps to transfer the fuel from the rear to t he front. The engine is fueled from the front tanks only. I used the rear fuel tanks only once flying from-Mt Pleasant,-Michigan to Stillwater, Oklahoma. I put only 10 gal in each of the rear tanks for th at flight, and of course-full front tanks. Jerzy - --- On Sun, 11/15/09, Galin Hernandez wrote: From: Galin Hernandez Subject: KIS-List: Long Range Fuel Tanks All; - After a LOT of work, we finally finished increasing the fuel capacity of my airplane. We (read mostly Rich)-sealed up a bay just behind the existing fuel tank and created a cross flow from this bay to the existing one.-Be tween the two bays we put a cross flow section and a fuel vent so the new f uel-bay empties into the existing one via the cross flow eliminating havi ng-to complicate the existing fuel system. The cross flow section has an equivalent size of a-2" hole-so plenty of fuel can cross over. It also has-a fuel drain since water can possibly pool here. With this setup, I n ow have 46Gallons of useable fuel in each wing for a total of 92Gallons of fuel.- I also added a metal tab which indicates approximately 30Gallons w hen the fuel reaches it. The max gross weight stays the same so I have a re duced payload with full fuel. It also-slightly changed-the fuel tank's center of gravity from 43 to 48". However even under all possible combinati ons of fuel loading, you can't get the CG out of limits. - It didn't go without a fight. The right wing went off without a hitch. We ( once again read Rich) had a LOT of problems properly sealing-the left win g tank. We had to open and seal the bay twice. Even then, it leaked and wou nd up having to-dissasemble the wing twice before-it was-completely s ealed. - With the 92Gallons of useable fuel, I now have 11.5hrs of endurance which t ranslates to almost 1500NM range-if burning 8GPH at max range speed of 13 0Kts. I am now limited-by-bladder capacity, not-airplane fuel capacit y. While flying around Central America I have arrived at airports that were supposed to have fuel but didn't. Now if this happens I can continue on to my next point instead of having to wait a few days for fuel to be delivere d. I also took advantage of the fact the tanks were empty to-verify the f uel-meter indications-and calibrate a "Universal FUELHAWK" fuel gauge s pecifically for my tanks as I filled them for the 1st time. I now have exte nded range as well as-real good-fuel management data. - I posted some pictures of the work on my webpage: http://puertoricoflyer.co m/cgi-bin/photoalbum/view_album/191461 - Galin N819PR - - - - ________________________________ Message 2 _____________________________________ Time: 05:41:16 AM PST US From: Galin Hernandez Subject: Re: KIS-List: Long Range Fuel Tanks Jerzy; The cross flow goes under the spar between the tanks. Rich cut a hole in the bottom of each bay, then built the cross flow slightly underneath the wing. It has a slight bulge under the wing in a teardrop shape. Once closed up, it looks real good and makes a perfect place to put a fuel drain. This eliminated any transfer system or possible failure point. I added two more pictures of the crossover to give a better idea. Galin N819PR On Mon, Nov 16, 2009 at 6:50 AM, jerzy krasinski < jerzy_krasinski@sbcglobal.net> wrote: > I have similar tanks in my plane. > > However, II have hard time to understand the cross flow between the tanks. > The spar is in the way and drilling the spar does not look good. > Did you make the cross flow within the lower skin? > > In my plane I installed extra pumps to transfer the fuel from the rear to > the front. > The engine is fueled from the front tanks only. > I used the rear fuel tanks only once flying from Mt Pleasant, Michigan to > Stillwater, Oklahoma. I put only 10 gal in each of the rear tanks for that > flight, and of course full front tanks. > > Jerzy > > > --- On *Sun, 11/15/09, Galin Hernandez * wrote: > > > From: Galin Hernandez > Subject: KIS-List: Long Range Fuel Tanks > To: kis-list@matronics.com > Date: Sunday, November 15, 2009, 10:51 PM > > All; > > After a LOT of work, we finally finished increasing the fuel capacity of my > airplane. We (read mostly Rich) sealed up a bay just behind the existing > fuel tank and created a cross flow from this bay to the existing > one. Between the two bays we put a cross flow section and a fuel vent so the > new fuel bay empties into the existing one via the cross flow eliminating > having to complicate the existing fuel system. The cross flow section has an > equivalent size of a 2" hole so plenty of fuel can cross over. It also has a > fuel drain since water can possibly pool here. With this setup, I now have > 46Gallons of useable fuel in each wing for a total of 92Gallons of fuel. I > also added a metal tab which indicates approximately 30Gallons when the fuel > reaches it. The max gross weight stays the same so I have a reduced payload > with full fuel. It also slightly changed the fuel tank's center of gravity > from 43 to 48". However even under all possible combinations of fuel > loading, you can't get the CG out of limits. > > It didn't go without a fight. The right wing went off without a hitch. We > (once again read Rich) had a LOT of problems properly sealing the left wing > tank. We had to open and seal the bay twice. Even then, it leaked and wound > up having to dissasemble the wing twice before it was completely sealed. > > With the 92Gallons of useable fuel, I now have 11.5hrs of endurance which > translates to almost 1500NM range if burning 8GPH at max range speed of > 130Kts. I am now limited by bladder capacity, not airplane fuel capacity. > While flying around Central America I have arrived at airports that were > supposed to have fuel but didn't. Now if this happens I can continue on to > my next point instead of having to wait a few days for fuel to be delivered. > I also took advantage of the fact the tanks were empty to verify the > fuel meter indications and calibrate a "Universal FUELHAWK" fuel gauge > specifically for my tanks as I filled them for the 1st time. I now have > extended range as well as real good fuel management data. > > I posted some pictures of the work on my webpage: > http://puertoricoflyer.com/cgi-bin/photoalbum/view_album/191461 > > Galin > N819PR > > > * > > ollow target=_blank>www.aeroelectric.com > /" rel=nofollow target=_blank>www.buildersbooks.com > ofollow target=_blank>www.homebuilthelp.com > llow target=_blank>http://www.matronics.com/contribution > =nofollow target=_blank>http://www.matronics.com/Navigator?KIS-List > et=_blank>http://forums.matronics.com > * > > * > > * > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kis-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/KIS-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/kis-list Browse Digests http://www.matronics.com/digest/kis-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.