Calculating Pitch Rate
Dave Jesse on June 5, 2013

One of the derived parameters that we deal with in FDM is the rate of pitch of the aircraft. There are conflicting requirements here, with a high pitch rate at takeoff making a clean transition from ground-

When Does the Aircraft Land?
Dave Jesse on May 29, 2013

This appears at first to be a simple question, but like all things in life if you dig deeper it gets more complex. Working out exactly when the aircraft touches down on the runway can be difficult,

Stretching your Python – Part 2
Dave Jesse on May 22, 2013

In this, the second of a two-part thriller, I promised to look at the numerical python library Numpy. Numpy is one of a pair of extensions to the Python library, with a partner Scipy dealing with scientific

Stretching your Python
Dave Jesse on May 17, 2013

The Python programming language (actually, it’s named after Monty Python, not the snakes) is very popular and its user base is growing rapidly. I don’t plan to go into the reasons for this here, just take

Key Point Values
Admin FDS on May 9, 2013

Those of you who have downloaded the POLARIS software will have seen a module which computes all the Key Point Values (KPVs) from a flight segment. This blog will just scratch the surface

All in a Flap
Dave Jesse on May 1, 2013

To allow an aircraft to fly slowly flaps and slats of various forms are used. These both increase the effective wing area and increase the camber of the wing, which increase the lift that can be achieved

Breaking Runways
Dave Jesse on April 19, 2013

This week I am at a conference in the USA, so it’s a quick blog from the hotel room between presentations. Let’s talk about runway_snap, one of the POLARIS library routines. The POLARIS open source

Truck and Trailer
Dave Jesse on April 10, 2013

After a short Easter break from blogging, it’s time for a nice easy topic. As you will see, I really should have posted this one two weeks ago… Imagine, if you will, a delivery truck bringing chocolate

Ground Cushions Are Not Fair
Dave Jesse on March 27, 2013

Imagine you are a particle of air way up in the atmosphere. An aircraft flies past 100ft above you, and for a moment you duck to let it pass by. This is a happy way of thinking about the local air movements

Inertial Smoothing
Dave Jesse on March 21, 2013

Aircraft height and speed are typically sampled once per second. Sometimes this is not good enough for the question we are trying to answer, for example “what was the vertical speed at the moment of touchdown?”.