Analog airspeed sensor means at least the following:
- new code
- add components price (sensor, Pitot, connection tubes)
- add weight (sensor, Pitot, connection tubes, airframe modifications)
- add multiple points of failure (code, sensor, Pitot - I've had on a real airplane twice in a week bugs and dirt into the Pitot tube resulting in indications of 20% real airspeed)
- for good results one should calibrate sensor-Pitot
An incorrect measurement is worse than a good estimation.
My proposal here is to evaluate the possibility to implement something similar to what exist on the UAVDevBoard - wind estimation without an airspeed sensor - the result is an approximation of both airspeed and wind speed.
Take a look at the theory:
http://gentlenav.googlecode.com/files/W ... mation.pdfand the implementation:
http://code.google.com/p/gentlenav/sour ... /estWind.c