What is the ratio betwen the dead weight of an air craft to passenger plus cargo?

Question

i hope both are not equal -

Answer 1

Depends on the range.  Short range airplanes have a higher operating empty weight (OEW) to MTOW (max takeoff weight) ratio, because they carry less fuel.  The farther the airplane can fly, the more its MTOW is fuel.  OEW is usually about half the MTOW or so, with the difference being about half payload and half fuel- ie payload is about 1/4 of MTOW.

Answer 2

Each aircraft is different based design, engines, fuel amount, structal design.

I actually figured this out with cargo config aircraft, due that the cabins are removed and there is nothing in them except fire protection.

Using a  ratio of MTOW vs Useful Load for a bunch of different aircrafts (dc-9, dc-9-30, b-727-200, da-20, be-99, c-310,grand carvan, cv-5800, and some others) and when averaged out, it comes out to about 3 lbs of a/c to 1lb of a/c load, or in other terms, for every 4 lbs the a/c weights at MTOW, 3 of it is dead weight.