Hi Brian, considering I intend to put a Subaru engine in my airplane, I'm not
to adverse to automotive stuff on my plane. What I was looking to do with the
ram air system is have a non mechanical/electrical solution. I like the
simplicity of the gravity feed system, and I would love to find a solution
that works without any pilot intervention. I may end up doing what Warren
suggested with separate plumbing, but that another valve that has to be pilot
actuated to make the system work... I like the idea of put fuel in the tank
and forget about it, it will find its way to the engine!
As far as wing loading, we are not really talking about modifying the
wing/tank design, just not drilling baffle holes in one of the tank ribs
effectively splitting the tank in two. The tank size and construction would
otherwise be build exactly to Murphy's instructions. By keeping the rib of
your choice be it the 3rd or 4th whole, and fully sealing it off you now have
two tanks in the same space as one large one. This should not effect wing
loading at all. On the other hand, while your idea of splitting the tank skin
and tanks by 6 inches or so may make installation easier, but it would take
one 32 thousandths solid tank skin and split and separate it which I believe
would impact the wing's strength.
I'd love to be able to connect the outter tank to the inner with nothing more
than a check valve, but if I cannot demonstrate that this will work
effectively, then I will plumb the outter tank through the inner and have
separate shut off valves on the root rib like Warren has described. I would
imagine you could also run a small like through the inner tank to a separate
set of sight guages if you didn't want the complexity or expense of electric
fuel senders and guages also.
Mike
195SR
On 4/14/2002 12:56 PM,
MURPHY-REBEL@DCSOL.COM wrote to MIKE DAVIS:
->
->
-> Hey Mike,
->
-> Wow! The cost of these simple items on planes still amazes me.
-> Anyway, I know nobody "likes" automotive stuff on a plane, but
-> Princess Auto has 12volt in-line fuel pumps for 89 Canadian, regular
-> catalogue price. That would give you some fuel management control
-> that I haven't read into your ram-air idea. =20
->
-> I realize you are trying to do this compartmentalizing by just
-> continuing the pro-sealing, but what about adding just one rib about
-> 6 inches over to separate the two tanks, then you've got room to work
-> at different methods and allows two top tank skins (one per tank) of
-> smaller size than one big one, and easier to proseal than trying to do
-> a huge one.=20
->
-> One more quickie. I don't know about the SR, but on the standard
-> Rebel, one end of the tank is the root, and the other end is at the
-> third rib. The wing strut attach area is between the fourth and fifth
-> ribs, admittedly forward of the proposed tankage area, but have you
-> considered the wing loading and flexing if you do what you are
-> proposing. Just a thought.
->
-> Brian Lawson,
-> Windsor, Ontario.
-> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
-> On Sat, 13 Apr 2002 22:35:32 +0400, you wrote:
->
-> >Mike,
-> >I weighed all the parts and the system will weight 955gms + per wing or =
-> 2.1lbs.
-> >Add misc. for a total of ~4.5lbs.
-> >Cost looks like it'll run about 650 USD. I'm short by about 300USD in =
-> parts but at least I'd be putting the 350 worth I have to use.
-> >
-> >1/2"x48" tube 125g 3US
-> >3/4"x48" tube 200g 5US
-> >Brass Fuel valve
-> >& fittings 175g 23US
-> >Fuel cap/flange 100g 50US
-> >Rib W-173 +? 48US
-> >Drain 015g 11US
-> >3x Lrg flange 040g 21US (3)
-> >4x Sml flange 020g 28US (4)
-> >Strainer 020g 7US
-> >Probe 200g 116US
-> >Rib Gussets 060g
-> >Total 955g 312USD per wing
-> >
-> >Plus: wire, nylon fittings, fuel line, x-vent line, proseal, rivets
-> >Less: holes drilled in skins.
-> >
-> >
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