I am using eCalc to design my first DIY drone. The design goal is a platform for photograghy. I've backed into some of the parts so excuse some of the selections. The motor selection is what is currently confusing me.
The frame is a 450mm so it can be large enough to stable enough to support a gimbal (Zenmuse H3-3D 3-Axis Gimbal) and a camera (Campark X20 4K 20MP). Those two things I kind of backed into. I would like to have a drone that would support a GPS only because at some point I would like to program a flight path (plus I am afraid of losing it).
With a goal of 20 minute flight time I am having a problem with motor selection. I think I need a motor in the range of 950 to 1100 KV but either I don't get anything close to flight time or the thrust numbers are wacky. Increasing the battery capacity just makes the thrust numbers worse, I assume due to weight. I have a 3S 5000 mAh battery in the design but not sure that is correct.
The question is how do you go about sizing the motor and then finding it with a reasonable shipping lead time? It seems like every motor I think might work is shipped from overseas.
P.S. Please let me know if I am going down the wrong path here. As a noob any input is welcome and won't hurt my feelings.