To visualize to the customer how much the whole aircraft weight (or
cost, payload) will change if specifications are altered, trade studies
are used. For this particular aircraft a range to total weight
and a study on payload to total weight is especially intresting.
We recalculate the fuel fraction with some different ranges on the
normal cruise mission leg, say 690 and 740 nm and plot the resulting
file=tradestud1.eps, width=8cm
1100 lb is very much electronic equipment. When the aircraft is ready
to be equipped with avionics that will perform as required, the weight
of them will propably be halved some times. If we can ease the payload
by some hundred lbs we get this chart:
file=tradestud2.eps, width=8cm
in a chart:
Chart 4.1. Total weight vs. range.
Chart 4.2. Total weight vs. weight of avionics.