ZeXx86 wrote:
Both pressure sensor and GNSS are used for determining altitude of the model.
Spirit Settings software is displaying only readings from the pressure sensor. In the most cases pilots are doing setup in a building which is nearly useless for a positioning systems.
Anyway for real flights it is important that there are 12 satellites always which should be the case usually within 40 seconds from battery power up.
Waiting minute or so should be enough (from power up time) if the model has clear sky visibility.
Waiting has really benefit for Altitude Limit feature if it is first flight of the day or in a few hours. With next powerups GeoLink should be fixed within ~6 - 10 seconds.
Testing the altitude limit so that you will change collective pitch quickly is unfortunately the worst way as blades are changing pressure very significantly. Testing in a real flight with a high lower limit should be the best and the safest way.
Hello Tomas,
I was merely comparing acquisition time between indoor bench test and outside real flight and that the unit is sensitive enough to acquire satellites even in an indoor bench test situation.
As I mentioned on the first flight of the day I usually like to wait an extra 30 seconds or so after the indicator light on the GeoLink is solid blue before spooling up and taking flight. I also mentioned that succeeding flight in the same flight session should require less acquisition time as you also mentioned.
I believe you have read the test results that morrchew and I have provided that were confirmed by a third pilot and forwarded to you in respect to the performance of the Altitude Limit. With settings of 10 meter lower limit with triggering set at 10 (maximum) and rescue pitch of 90% that the feature would save the model say at a descending from a altitude of 30 meters with a pitch of negative 6° (heli descending in upright orientation) the Altitude Limit would save the heli even if it dropped to say 8 meters before ascending upwards. Given the noted scenario the heli continues descent and is not caught by the feature as our test results have shown time and time again. So I must ask was this feature made for sport flying with soft 3D, and for scale flyers where no sudden collective pitch maneuvers are made in flight and not for a novice who might panic with sudden adverse collective pitch movements that would send his model through the lower threshold and subsequently crashing to the ground.
A friend and fellow pilot had experience with the Skookum 720 units which also featured Hard Deck and it saved his model every time even with faster descending rates. I realize that the Spirit and Skooum are two different units and its like comparing apples to oranges, but I am curious what other possible component in the hardware or software enable the Skookum to preform that well under the same flying conditions.
In closing maybe my expectations of the Spirit and GeoLink Altitude Limit feature are more than what our test results yielded.
Best Regards,
Kevin
