Hamburger 3330 Fuel filter

[joedallas]

Hamburger 3330 Fuel filter

I thinking about using this filter for fuel from the wings to the
two facet 40105 fuel pumps

http://www.jegs.com/i/Hamburgers/497...ductId=1168208

This is the best fit in the area available

Has anyone ever heard any thing about this company


Thanks

Joe dallas

[spark68]

Jegs is a reputable company and Hamburger has been manufacturing auto race parts for many years so no problem there.

It's kinda small though. Think about the filter area and how quickly it could fill with debris and stop you fuel flow.

BTW, this is posted in the RV-12 area. Don't they just have one fuel tank in the fuse?

[joedallas]

Yes they do
I have built home made tanks in the wings of my 12

http://joesrv12.com/Builder%20Log/al_06_03.htm

and a header tank under the floor in the baggage area

http://joesrv12.com/Builder%20Log/al_06_05.htm

There are screens on the fuel pickup fittings in the tanks

The wing tanks feed the header tank and there will be a filter at each tank.

And also a fuel gauge at each tank.

Thanks

Joe Dallas

Originally Posted by spark68

Jegs is a reputable company and Hamburger has been manufacturing auto race parts for many years so no problem there.

It's kinda small though. Think about the filter area and how quickly it could fill with debris and stop you fuel flow.

BTW, this is posted in the RV-12 area. Don't they just have one fuel tank in the fuse?

[Dave12]

Impressive work Joe.

[Walt]

I agree, to small and to fine to be on the suction side, especially with auto fuel!

[joedallas]

[Walt

I agree

I have a small place that I can get to easy

To use a larger filter I would have to put in the wings and it would be harder to service

I will look for a slightly larger filter
at about 50 to 70 Micron

The pump and filter are lower than the wing tanks
and I will not use auto fuel

Is anyone using a fuel filter in front of the Facet 40105 fuel pump and do you know what Facet recommends


( I just checked Facet site they recommend a pre-filter of 74 Micron in front of the pump )

Thanks

Joe Dallas




QUOTE=Walt;1076824]I agree, to small and to fine to be on the suction side, especially with auto fuel![/quote]

[David Paule]

Joe, how do you carry the shear load through those middle ribs?



Dave

[joedallas]

Not sure what you are asking.
I think the answer you are asking for is

The section modulus of the top and bottom cord.

Section modulus is a geometric property for a given cross-section used in the design of beams or flexural members.

Joe Dallas

Originally Posted by David Paule

Joe, how do you carry the shear load through those middle ribs?



Dave

[Pat Stewart]

Two Facet pumps?

[David Paule]

The section modulus describes the relationship between the bending load and the bending stress. I've shown a somewhat arbitrary load in the figure below, but any ground or air or handling load will introduce loads to the ribs. For that matter, load will go in to the ribs from the rear spar. Also, if the load is indeed from the fuel, unless the tank is attached to the top cap of the rib, all the shear force will be on the bottom cap, because the load path round the back of the rib and then forward across the top cap appears relatively flexible compared to the more direct load on the bottom cap.



The shear is the actual force being carried and I showed that in red. The blue vertical arrows represent the reaction shear forces due to this load, while the horizontal arrows represent the reaction forces on the spar from the load. In your photo, the shear is carried into the spar by the flange on the front of the rib, and the fasteners between the rib and spar there, and that appears to be in order. But there's very little material at the forward end of the ribs to connect to those flanges, and it's not clear how that shear load is transferred.

If the stiffness at those points is considerably lower than the beefed-up rib flange assembly, the forward end of the ribs can act as a hinge. In that case, those ribs, having little shear stiffness, can't carry much load.

This stands in contrast to the significant amount of material and the generous radius of the forward lightening hole at the front of the RV-12 ribs, as the factory designed them. Also, note the formed bead around the hole, which helps prevent local buckling.

Hence my post.

Dave