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KAVAN Cumul 100 - Instruction manual
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=== Flying === Be sure you are using fully charged batteries. Now (and before any further flight again) check correct function of whole radio equipment, motor and moving of control surfaces. Be sure any part of flight equipment cannot move during flight. We strongly recommend making a range check (see your radio instruction manual for details). '''The first flight:''' Wait for a calm day. Fly only on a safe site as a RC club flying field. Glider will be very happy on your favourite slope on a calm day. The very light lift will allow perfect fine trimming out. '''Glider:''' Switch your transmitter and then the receiver on and check all the working systems one more. Facing INTO the wind hold your transmitter in one hand; grip the model in the other hand near the centre of gravity. Hold it at head level and give the model a fairly powerful push exactly into wind; wings level, nose slightly down. Your model should now glide in a long, flat and straight path without needing any help from you. Use the controls gently if necessary, and adjust the trim tabs until your CUMUL 100 glides above described way. Now check the position of control surfaces; set length of pushrods to bring back trim tabs on your transmitter to central position if necessary (we strongly recommend doing it in any way). Check again gliding of your CUMUL 100. Now you are ready to make your first bungee launch. Always use a bungee set appropriate to the size (100β150 m) and weight of your model! '''Electric version:''' Switch your transmitter and then the receiver on and check all the working systems once again. Launch your CUMUL 100 with throttle fully open INTO the wind. During climbing be gentle on the controls; try to keep the model flying into the wind until you have about 100β150 metres of altitude. Climb slowly - too steep climbing may cause the model will stall and fall to the ground. You are at 150 metres - this is time to trim out your CUMUL 100 at full power. After everything is OK - it means the model at approx. 50β60% of full throttle flies straight without turning, descending or ascending (if your CUMUL 100 already tends to ascend you will have to increase motor down thrust), turn the motor off and test CUMUL 100βs gliding characteristics. Keep your CUMUL 100 into the wind and observe its flight. If it turns without power right (although under power it kept the straight direction) it will be necessary to increase motor right side thrust and vice versa. If descends too much without power (although under power it kept the level flight) you will have to increase motor down thrust (assuming the centre of gravity is correct! - check it after landing). '''Final fine tuning:''' During next flights trim out your CUMUL 100 to find optimal setting - safe climbing and good gliding - it is a compromise, of course. You might find useful programming a butterfly/camber β elevator mix (if your radio allows) that will eliminate the nose pitching when the butterfly brake is being deployed or the camber changing flaps/ailerons are being extended. In general the CG position should be located between 77β81 mm behind the wing leading edge. By moving the CG back you get better gliding performance whilst reducing the stability. It makes your model more sensitive on controls and increases the model reaction on thermal. The back CG position makes the model more difficult to fly and requires more attention from you, while a nose heavy model is easier to fly but you will lack the performance. We recommend starting with the CG at 77 mm behind the leading edge. Beyond 81 mm the increasing lack of stability starts to prevail over the gain of gliding performance. '''Enjoy your new CUMUL 100, have a ball!'''
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