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
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: 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 <galinhdz@gmail.com> wrote:
From: Galin Hernandez <galinhdz@gmail.com>
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
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: 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 <galinhdz@gmail.com>* wrote:
>
>
> From: Galin Hernandez <galinhdz@gmail.com>
> 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
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|