How to calculate the correct LDB (LANDING FUEL INDEX)

[davidngr]

I am struggling to understand on how to calculate the correct LDB, when it comes to setting the correct pitch trim setting for LILW.

The formula is the following LIZFW-LDB=LILW. I have read thoroughly the manual but something is still unclear to me. Could someone give me a real example on how to get there?

[TOBS]

I would say forget this. It is not possible to trim the plane correctly with this formular cause you cannot load it accurately. It does not matter where you place people. Just trim your plane to the Vref and a desired sinkrate (On final). This is what I think. There are other planes in xplane where you change the balance with your payload - not the CRJ 200 - not yet I think.

Cheers Tom

[thiengo]

When you did calculate the weight and balance on departure airport, you put the payload and fuel to destination.

You know your Basico Operational Weight, immutable..

The payload did not dropped from aircraft in flight.

But your fuel was consumed and this weight is smaller then before.

This is the reasoning to find the LW... and trim... and vrefs...

Get the TOW and have in mind the amount of fuel on takeoff, and trip fuel.

the LILW is based on fuel consumption.

LITOW = LIZFW - FOB(Fuel on board) weight from fuel will generate the index.

LILW = LIZFW - LDB (Landing fuel) this is the FOB minus trip fuel.

To land the important is the LW.

see fuel index variation.

The manual do not mention landing speeds, but the vcards are done to demonstrate the vspeeds for takeoff and landing too, as: V2, Vt, Vref(Manouver and approach) for flaps based on weight, wind and atmosphere data. Landing field(condition) lenght are present too.