Hexaltitude
Description
WORK IN PROGRESS UPDATES : [20/08/2020]4S 5000mah LIPO + 2212 920kv + 1038 gave approximately 11mins14s flight with weight equivalent to gimbal+camera (13mins30s without). This is correct eprformance. However this propulsion can't handle motor loss (copter can maintain stability but sacrify yaw control because too few thrust, just allow an emergency harsh landing. This can be solved by replacing 2212 920kv by 2216 810kv. However by this solution low cost side is abandoned for equivalent performance. As I want now to have compact copter only for video, I switch on 6S quadcopter design. Conclusion : motor redundancy is efficient ONLY if thrust is more than enough, unless this, hexacopter don't have interest. [03/07/2020] Retractable landing gear available and testing video https://www.thingiverse.com/thing:4519648 https://youtu.be/M7KORC912Xo [22/06/2020] Source DJI advice, up to 1800g aircraft 3S batteries appear not suitable, it need 4S (maximum 2500g) that induce others propeller's (1038, 9", 8"). https://youtu.be/Nzm3Du8Mqqs [17/06/2020] New battery case and door available for Ovonic 3S 8000mAh New equipment plate for FS IA6B receiver, GPS and vented TX526 mount Hexaltitude is a modular, low cost, foldable hexacopter. (on the photo, no retracts yet) It’s was created from the original design of the hexocopter(https://www.thingiverse.com/thing:2169165). This original design appeared perfectible for different reasons : - battery size limited - difficult to change the camera support - difficult to access to the power distribution board - not reliable and unstable tripod landing gear (the most problematic for me) So I decided to bring my own solution. Why this design : - Hexacopter for the load capacity, motor redundancy (if failure of a motor & low weight, can allow RTL or emergency landing). - Aluminium arms more rigid and compact than plastic, easier to find than carbon fiber. - Foldable for transport (however I never fold mine). - Rear landing gear fixed to gain weight, front fixed or retractible (for the view). - Customisable battery case to fit another battery size. - Battery case and camera on picatiny rail for modularity. At the bottom of the copter is a Picatiny rail that allow you to attach everything that you want and to remove it easily (1 srew). It’s especially useful to overcome the problem of battery case, enclosed there is a battery case and freecad files that you can adapt (if you feel ok on freecad) to your own battery size if you need it. Use : I use this copter mainly for fpv with gimbal and photogrametry with fixed mount (with aim of crop survey test in future). Miscelaneous : - remix of a 3axis storm32 gimbal for the rail (https://www.thingiverse.com/thing:4437200) - fixed gopro type mount (https://www.thingiverse.com/thing:4437210) My Mission Planner parameters file for the copter is enclosed. WARNING : all calibrations are of course only for my equipment, follow tutorial on internet to adapt to your equipment. NB : my landing vertical speed is big (2.5m/s) but slow down at 7 meters altitude (50cm/s). Rretractible landing gear mount based on PZ-15094M size was never printed/tested (I don’t have the parts yet). Possible enhancement : - To increase endurance, motors and propellers can be bigger with lower KV, 11inch possible now, for 12inch it would be better to extend the arms few (actual 640mm, it can fit but props would be 0.59inh from each others). - Carbon arms could ensure lower weight. - An electronic hood would be fine but must not hide the pixhawk status light (transparent ?). - Motors support are tilted 5° on the original design, probably for better stability, I ignore if this is useful or only cost more power / flight time. BOM : - All printed parts - Some M3 and M4 srews and nuts +-5€. - Aluminium square tube 12mm (2m probably) +- 5€. - Power distribution board +-3€. - Battery, take care about the Number of C you need, if not enough flight time would be reduced or even can cause a crash +-35€. - Kit with Pixhawk controller, it’s mount, safety switch, buzzer, powermodule and GPS +-58€. - Receiver according to your radio (I have FS IA6B for example, IA10B would be better) +-12€ - ESC 30A, DJI2212 or A2212 (around 920KV) motors and 1045 or 1038 propellers X6 (or other kind that you estimate suitable) +-58€. TOTAL without options : 176 Optionally : - telemetry modules +-20€ - VTX +-11€ - OSD +-5€ - PZ15-094 retracts x2 +-20€. - 3 axis gimbal +-43€ - video 5.8ghz antenna x2 +-9€. - Video receiver ROT G1 pro +-13€. - Av cable for camera +-3€ TOTAL of options : 124€ All this doesn't include remote control, battery charger, camera. Estimated performance : Total weight with 8000mah battery (420g), telemetry, vtx, and 3 axis gimbal with camera (+-200g) is 2.23kg, +-10 minutes flight time. Advices : - Choice between Telemetry+vtx or OSD+VTX is hard, for purely video use I recommand OSD+VTX but with bluetooth telemetry (5€) that will allow you to calibrate, upload parameters and waypoint / missions from computer or phone without cable. - if you have GPS problem with the telemetry on, antenna is probably bad I had a crash due to this, that caused automatic landing in high grass because battery over before to be at home! - After unmounting ESC or Motor, always test well the rotation direction of your props with mission planner. - DJI type motors like the 2212 920KV (readytosky for example) require DJI type propellers hub, I would probably choose another similar kind of motors if I knew it was not standard. - I often ask to myself to change motors for 11 or 12inch props but it’s less standard (motor & propellers) so price is bigger when you need to change something. Good luck!
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