in the last two weeks i did three testflights with my nimbus and it was very exciting.
But i got some issues at my 3. flight... I lost one connector of the Turnigy CA120 Motor. Maybe the soldering was bad and the contact resistance to high. And i also recognized the higher temperature of the motor and the Lipos (about 70°Celsius). Can that be a reason of the red leaf (28x10)? At my test i got about 130 Amps at 55 Volts out of my 8000mAh Zippys.
I builded my frame like the CAD file from Gamba. All the stuff is balanced but when i switch on the motor the frame push upwards and so i get not all thrust forward...I climbed only 80 meters above the starting point. Does anyone have a sketch with a working nimbus?
addy wrote: I builded my frame like the CAD file from Gamba. All the stuff is balanced but when i switch on the motor the frame push upwards and so i get not all thrust forward
Sorry, but I don't think it is the design and I think It's an easy fix. To prevent the system from tilting when powered, the pressure point must be directly on your suspension point. If the pressure point is above the suspension point, the Nimbus will tilt forward/down... and vice versa. So, you just need to adjust the angle of the motor.
I'm not quite sur yet what material to use for the cage, first i wanted to use 8/2mm aluminium tube but this is not available locally. The other option would be CFK and GFK tube but im not sure if this is strong enough.
I already started with bending the aluminium tube, the first bend was not so pretty because the bending radius was too small (12cm) i then used a larger radius for the other bends (19cm) and that went quite well. Another problem that i ran into was that the end of the tube where the motor attatches is very far behind the end of the harness (30cm) i hope this still works.
The motormount and battery are ready. Still undecided what material to use for the cage, i would prefer 8mm aluminium tube but its not available here, so i probably have to go with carbon tube and glass fiber rod for the ring.