Titan Dynamics Falcon V2 - Aircraft Performance Analysis

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2.2: Aircraft Performance:
Below are some plots showing aircraft performance at different all-up weights.
The
values predicted are not perfect, and values like efficiency can vary greatly based on
the choice of motor and propeller, among many other factors.
These just serve to give
a rough idea of the sort of performance you can expect and give you an idea of the flight
envelope of your aircraft before you fly it and help narrow in on the most efficient cruise
speed. The stall speed assumes a C
Lmax
of 1.42, and the minimum speed line is just 20%
above stall speed. Below the minimum speed, a tailwind gust can cause the aircraft to
stall unexpectedly, so be careful.
Using the drag plot can help figure out how much thrust you’ll need in level flight at a
given speed. This allows for the use of propeller data from companies like APC to choose
the best propeller for the type of flying you want to do.
The plot depicting power required for flight can help you estimate your loiter endurance
at a given speed. If you want the maximum time in the air, fly at the speed which uses the
least power to stay in the air.
The efficiency plot shows you what sort of efficiency to expect at each speed. With it, it’s
possible to choose the best cruise speed for your setup and see how changes in that
speed may affect your efficiency.
The fuselage angle of attack plot shows you what angle of attack the fuselage will be at a
given speed. This can be useful when setting the TRIM_PITCH_CD parameter in Arduplane
to the angle of attack value that corresponds with your cruise speed.
The plots in section 2.2.2 are just to give an idea of the sort of performance that can be
expected for certain battery configurations.
They are not a guarantee of performance
,
as there are too many variables to account for when individuals build the aircraft. Extra
draggy antennas, inefficient motors, surface quality, etc. can all change flight
performance drastically.