Vario Comparison

On Saturday, September 8, 2018 at 7:14:46 PM UTC-5, SoaringXCellence wrote:
AOA devices are becoming very common in the experimental/homebuilt airplane world. A recent publication from the FAA (!) recommended that pilots consider getting a AOA sensor installed in their airplane. The newer completed aircraft in the famous Vans Aircraft RV series are almost all equipped with a AOA device.

I have been investigating a AOA system to install in gliders for several years but keep running into challenges due to flaps and spoilers and their effect on the system. The whole device is very easy if the airflow and overall AOA doesn't change much with configuration changes.

One fix is to set the system primarily for landing and disable it for other flight regimes. Unfortunately that means you can't use the best L/D AOA, or other selected angles to correct for weight changes.

I also have a Raspberry Pi and considered just starting to log the data for my glider. This winter I'm doing a refinish; maybe that a good time to install the pressure sensors and start logging.

Mike

In the SZD55-1 Flight manual,

http://org.ntnu.no/nthf/dokument/fli...als/LN-GAZ.pdf

p. 12a, it says that "For airworthiness the JAR-22 require the sailplane to be equipped at least with: airspeed indicator, altimeter and STALL WARNING DEVICE." I can remember there was some kind of a buzzer on the SZD-55 I used to own for a short time, but I never heard it sound nor don't know how it was supposed to work.


Any other SZD-55 owners/pilots here?