On 01/02/2009 05:42 AM, Torsten Dreyer wrote: >> For designers who prefer real volts: >> /systems/electrical/nominal = 12 >> /systems/electrical/subnominal = 7 > Doing it that way requires a definition of absolute values in each system and > for every possible operating voltage.
No, it does not require any such thing. The whole point of such a parameterization is to achieve independence from any particular absolute values. There is a scaling argument here, a dimensional analysis argument. By way of analogy, suppose we are asked to calculate the aspect ratio of a wing. The aspect ratio is dimensionless ... but the allowable and indeed conventional approach is to measure length in some dimensionful units and measure chord in the same units, and then divide. The units _drop out_. So it is with a properly jumpered instrument. The units _drop out_ of the final behavior. I repeat: The choice of units _drops out_ of the final behavior. This is the whole point of the jumper approach. This is what allows some designers to use nominal=1.0 while others use 12 or 28 ... with no change in the observable behavior and no loss of compatibility. ------------------------------------------------------------------------------ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
