Phil,

The doppler method is certainly more accurate than the eagletree stuff as soon you are able to correctly read the spectrograph.
the doppler method involve less measuring equipement than a eagletree stuff and is purely mathematic based.
the only incovenient is that it measure a ground speed (like the gps and the radar gun) the eagletree system measure the thrue airspeed........

By the way here is the first trial of the eagletree system

It was freezing this morning and I forgot my gloves home, so I made a short flight.
the sky was overcasted at 1000 Ft. I made that flight using 10 procent nytro APC 9*7 I am unable to give you my RPM because there was not enough light for my photocel rpm measuring tool and I don't have the eagletree racer expander (I will order that stuff now !!)
I tuned the engine with my ears and eyes (smoke and noise)

I made a very short flight and as you can see I reached the top speed of 93 MPH exiting a moderate dive

that's exactly the speed I was expecting !!!

I also pulled up a vertical who bringed me to a maximum recorded altitude of 894 ft, at this time the plane was disapearing in the clouds.

the unit recorded one glitch one elevons when I switched the system on and numerous glitches on my throttle servo. I have a old servo on my throttle.

more infos when the weather will be better


here is a screenshot of the display as it appear at the end of the playback. you can see the max altitude and airspeed display and the total amount of glitches.

I choose to not display the stick position because the soft doesn't support elevon mixing yet and the display is completly wrong, the artificial horizon also. (I exchanged some emails with eagletree support during setup and they said they are working to a software update )