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Multi engine fuel system set up

Old 06-29-2008, 12:12 PM
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Props4ever
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Default Multi engine fuel system set up

I like to know what would be best way to set up fueling system on the IB engines on my Connie.
There is no room for the fuel tank(10oz) to be placed in the nacelle as there will be main LG there. I am thinking on the lines of setting up separate tanks for both IBs in the fuselage and routing fuel lines through the wing into the nacelles and out the firewalls. Now there is almost 20" plus distance from fuel tank inside of the fuselage to the firewalls on both IBs..

Would it be wiser to gravity feed the tanks constantly as presently tanks will be higher then where engine will be mounted on IB nacelles. Or use some type of fuel pumps and cut the wing in the center to make a pocket where tanks will be set on little lower height or even 2oz hopper tank to pressure the system.

http://www.rcuniverse.com/forum/m_45...18/key_/tm.htm

I need your opinions and expertise to achieve proper set up for smooth fuel distribution from tanks to engines.

Cheers...
Old 06-29-2008, 12:41 PM
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Wayne22
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Default RE: Multi engine fuel system set up

Is there room in the wing for a sullivan saddle tank (11oz) or they also make slim oval tanks of various sizes.....

A draw of that much would certainly require a pump for each, plus if the tanks sit higher than the engines, you will need a shut off valve or clamp when the engines are stopped.....

Old 06-29-2008, 12:45 PM
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Props4ever
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Default RE: Multi engine fuel system set up


ORIGINAL: Wayne22

Is there room in the wing for a sullivan saddle tank (11oz) or they also make slim oval tanks of various sizes.....

A draw of that much would certainly require a pump for each, plus if the tanks sit higher than the engines, you will need a shut off valve or clamp when the engines are stopped.....

It's yes and no situation in my opinion, i guess i can cut out some foam between fuselage and IB nacelles on the wing to make a pocket but what type of saddle tanks are you referring to, do you have i picture of it?
Old 06-29-2008, 05:06 PM
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Default RE: Multi engine fuel system set up

hello sammy

i think this will solve your problem , it is called " folower tank "
http://www.rcscalebuilder.com/forum/...82&PN=1&TPN=11

look at this post of mine and roll down , not the first draw but the second one , you will see drawing of one 4oz tank near the engine and big tank in the wing on the CG line .

this will work fine for your plane
cheers - cobi
Old 06-29-2008, 07:17 PM
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Props4ever
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Default RE: Multi engine fuel system set up

Hey Cobi!!!

Long time no hear from ya man, How is life and how is your B24 coming along..

Can you post your thoughts on here please, i'm having problems accessing RCSB these days.

Thanks
Sammy
Old 06-29-2008, 07:27 PM
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Default RE: Multi engine fuel system set up

Well the only place on the wing i can think of installing tank is between fuse and IB nacelles and that is in front of CG point. I saw what happened to Mike's Hawkeye on his maiden flight and i don't want to repeat that with my model.

Here are the pictures from last year with wings separate from the fuselage sitting on the table. This tank could only be installed between LE and front and center spar between nacelles and fuselage.



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Old 06-29-2008, 10:47 PM
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Default RE: Multi engine fuel system set up

Being more specific of the fuel tanks locations if incorporated into the wing.

1- Between both front and canter spar, between root rib and IB nacelles.

or

2- Between LE and Front spar at same between root rib and IB nacelles.

I think i might have to make custom fiberglass fuel tanks to fit int these location soon.
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Old 06-30-2008, 06:36 AM
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Default RE: Multi engine fuel system set up

Can't believe the electric guys haven't jumped all over this one yet!.... Seriously, have you considered this? - no worries putting the "fuel" in the fuz then. I'm no electric convert, but this plane has electric written all over it.

Cam
Old 06-30-2008, 08:28 AM
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Default RE: Multi engine fuel system set up

ORIGINAL: camdyson

Can't believe the electric guys haven't jumped all over this one yet!.... Seriously, have you considered this? - no worries putting the "fuel" in the fuz then. I'm no electric convert, but this plane has electric written all over it.

Cam

Ha Ha, sponsor it then!!, i can't justify myself adding $1700-$2200 on top of other costs....

BTW my NIB Super Tiger G40s are coming in matter of days...he he
Old 06-30-2008, 11:43 AM
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Default RE: Multi engine fuel system set up

hello sammy

i dont know why but i can't put any photos in here ...... h e l p [X(]

my b-24 is going good , look at my post ..he..he

well my life is good ( and so is my wife ) ....thanks

i hope you solve your back problem and that you feel good

i will send you the folower tank draw by e-mail .

cheers - cobi
Old 07-02-2008, 12:24 PM
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Default RE: Multi engine fuel system set up

hello sammy

here is the draw of how the foloewr tank work , it is one system for one engine so you need 4 !!

cheers - cobi
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Old 07-02-2008, 03:16 PM
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Default RE: Multi engine fuel system set up


ORIGINAL: cobi.p

hello sammy

here is the draw of how the foloewr tank work , it is one system for one engine so you need 4 !!

cheers - cobi

Thanks for showing me the way Cobi, i will only need to add this system on my both IB engines as i can place main fanks in the fuselage and place 2 oz header tank in the nacelles with fueling dot.

My OB will be hooked up like any other 40-60sz single engine models.

Once again thanks very much

Cheers,
Sammy
Old 07-02-2008, 04:38 PM
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Default RE: Multi engine fuel system set up

hello sammy

NO ... dont put the main's in the fuselage , put them in the wing if possible on the C/G .

it is better having all the fuel tanks in the wings i.e. over the flying surface and not in the fuse as this places to much stress on the wing joints. As i said KISS one engine = one fuel tank system

cheers - cobi
Old 07-02-2008, 11:56 PM
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Default RE: Multi engine fuel system set up


I see what you are saying about placing fuel tanks in the wings.

Well i have an slight issue with this set up of placing fuel tanks in the wing!, my concern is about fuel swashing side to side once fuel is half or lower in quantity. Now if clunk picked up air while in turn, that engine will quit, wouldn't it?

Now if i would place them on center wing (Inside fuselage) then even if fuel is low, tanks won't turn so much to get air in the system. You know what i mean...

What type of already made fuel tanks are out there to be adaptable for my application in the wing?. I really would like to keep then near center of the aircraft Vs far out in the wing...am i making sense here!.


Sammy
Old 07-03-2008, 10:39 AM
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Default RE: Multi engine fuel system set up

well sammy you got it all wrong ...sorry

look good at the draw , the small tank ( 4 OZ ) is always in a full condition , only after the main ( big) tank is ampty the small tank start to drain , and you never get to it .

you will have right behind the firewall a small full fuel tank with no bubble's and with a good fule flow .

this is my 2 cent opinion

cheers - cobi
Old 07-03-2008, 01:55 PM
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Props4ever
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Default RE: Multi engine fuel system set up


So basically what you are saying that i should have both of these tanks close to each other in the nacelles?

If that is the case then i have rig up something to keep these in the nacelles, at this time it can't be done, let see what i can come up with once i have retracts and struts made for the mains and installed.

Old 07-08-2008, 05:25 AM
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Default RE: Multi engine fuel system set up

Why not to place fuel tank vertically? Conny is not aerobatic plane, so if you will not try to fly her inverted...
vertical tank may be more compactly placed inside
Old 07-15-2008, 05:34 PM
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Default RE: Multi engine fuel system set up


ORIGINAL: Wherewolf

Why not to place fuel tank vertically? Conny is not aerobatic plane, so if you will not try to fly her inverted...
vertical tank may be more compactly placed inside
Well i don't know about installing fuel tanks vertically, never seen one like that but it doesn't mean it hasn't been done yet either. Will need more info on placing fuel tanks vertically on multi engine model.
Old 07-31-2008, 02:39 AM
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Default RE: Multi engine fuel system set up

It does not matter 1 or more engines you have. Just imagine an ordinary placed tank on aerobatic plane, that flies directly up to the sky. Good aerobats has unlimited vertical perfomance, so I assume the will be no problem if you'll place your tanks right behind firewall, heading intake and pressure tubes up. Your intake will allways take fuel from bottom , unless you'll wanna do a roll ^_^
But the hight of an ordinary fuel tank ussualy smaller then it's length...



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