Articles Blog


December 3, 2019

this project respects our country law / Fly safe the beginning of the project between march and april, i saw a report on arte channel it spoke about a team building solar electric plane “pionneers” to have solar electric flight it was a small team the builder of the electric aircraft was a rc plane builder, he builds the wings, the fuse, all the structure so, if they build real airplane with a rcplane maker, , why could’nt we make a rc solar glider at home? that’s Yves who tolds me about his solarplane project , i found the idea interresting So i look on internet for the solar cells price and the solar parts were very cheap, why not So il look at the solar cells price, high performance and i saw on the web that it was very cheap So, it was cheap to buy solar cells To build a large rc electric glider we must be able to, if not we will find how to JJ had begun to work with 3d printers as a hobby that allows us to build a lot of wings and fuse parts we draw the parts on personnal computer, exactly at the good size and JJ knows perfectly the autopilot opensource For printing the parts, we choose a new filament, PET with % of carbon with this new filament, we can make thin , light solid parts we have more than 60 rib in the wings the size of the rib was as big as the 3d printer, so we hab to print using diagonal of the bed it takes a lot of times to print them all I said that maybe using all our skills we could have an endurance plane able to fly for a long time alone at low cost with solar enegy the first fly was in july the first fly went wrong because the motor we choosed was too light the current was too strong during the first climb, at about 60 meters high the motor burned with smokes so we emergency landed For the second flight, the weather was better and with a stronger motor we have been able to really test the motor, with several climbs and pilot it finnally the plane was not cool to pilot the rudders were not efficient it was too soft on the roll axis and on the pitch axis, the reactions of the plane were strange one of the solution was to change the motor angle because it was at 0 we had some degrees and the model was better we also hab a problem on the tail boom, it was too soft for the total weight of the plane so we reinforced it so the second flight was better but gave us more works to optimize it after the weather was bad, we had to wait we changed the gps place because of some interferencies the first real endurance flight was the 3rd september it lasted 6h50 the meteo was cloudy and the first flights have damaged many solar cells and also the handlings… the solar cells are very fragile we only get 6h50 on the first flights, to have a soft fuse a bad motor angle and also bad radio settings and average autopilot tuning the plane often stalls so we were anxious the stalls stopped easily in manual mode but started again regularly we changed the center of gravity and the angle of attack of the wing and at the rigidifications and settings we got big stalls because the climb rate was too strong by reducing the climb rate we stopped this problem climb rate 1m/s no stall with all these changes the plane was safe it can be pilot in manual or auto mode without any risks now we choose a 4m10 wing span plane folding props f5j with electric motor (quadcopter motor) a thin fuse with V-tail dihedral wings in the fuse we install the batteries li-ion , soldered at home 4S 7800MAH all the solar energy and 5v energy are in the wings in the fuse there is only batteries and esc because in the wings you have a lot of empty space we install solar cells everywhere we could 48 solar cells the solar panel produces 27v and between 5 / 5.5 amps maximum so we have between 120 150 watts, depends of the weather and the sun tilt on our youtube channel we will upload videos about flights and making tips about structure about electricity and wiring and about using the plane, our ground station and the team’s job during flights

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