François DUCASSOU retrieves his F1C at a distance of 16 kilometres

Published: 2016-04-18 17:39:42
Categories : Icare2

François DUCASSOU retrieves his F1C at a distance of 16 kilometres
19 September 2015,
- I made 4 flights with the number 3 and each time I dethermalised with the RDT, the flights  being set at 2 minutes. I did this in order to gain sufficient clearance from the field.
- during flight 5 the model took off correctly, climbed well and levelled at 140 m (receiver GPS data).
- after around 2’30 of flight it was impossible to dethermalise with the RDT. So I waited 3 minutes and nothing happened. I followed the model for a few more minutes, but in vain.
- I went back to the car to try with the programming unit but had no results.
- I stopped the competition, threw the equipment in a heap in the car and quietly followed  the model for about 1 hour.
- after 1 1/4 hours of flight the altitude began to decrease steadily and substantially, a sign that the model had dethermalised. 
- I found it dethermalised on the grounds of a company near Pons.
- it was 16.2 km as the crow flies from its point of departure.
 Trajectoire du modèle enregistrée
After examining the flight track on  Google Earth, I saw the motor had dethermalised at 1137 m of altitude and took 19 minutes to land. I arrived in the area by car
3 minutes later and found the model after 3 more minutes. Which may seem incredible. I was back in the field at 4:15 pm, approximately 2 hours after the beginning of the flight.
In conclusion, you no longer go out ‘to recover’ a model, you simply go and fetch it.
Method: stop the competition and immediately follow the model  with a suitable means or delegate someone else to do it (major competition, European or World championship), why? Because of the duration of the batteries powering the beacon (a few hours) , which is much less than a normal Ruyter-type beacon (a few days).
F1C studied the situation and concluded that I had had the same problem as Pierre and Gauthier. And yet Pierre had warned us about this on 24/04/2014.
ADVICE: given that precision is of little importance for DT, open the slot in the dural to create more space, so that the CAP/DT is very free.
The CAP/DT had been jammed. The problem was due to my double neglect of 1) not having understood the problem and taken it into account, and 2, of not having cleaned the comb on the timer relay.


In the end, it was just another problem due to negligence. In any case, it is never the model’s fault.
With a normal beacon recovery would have taken much longer, and may even have required a flight, in any event the model would have been recovered (it landed on the grounds of a company).
This negligence gave me the opportunity to carry out a full-scale test of the  Icare2  beacon and to appreciate its qualities.
My (non-objective) opinion: ESSENTIAL.