I want to build a Quad for tethered flight. Something that can climb and hold for long durations. Its just a hobby project, so I don't have any huge problems regarding reliability right now.
So here are the requirements:
1. Should be able to climb upto 200ft.
2. if the power supply fails from ground station the copter just lands using its battery power.
3. should be able to carry a gimble and go pro.
The weight of twisted pair cable that long will come out about 700-1000gm. Plus the wind effect on cable and craft. I think an addition 1kg of payload capability will be good. So a total payload capacity of 2kg should be good. Plus if I decide to give 220V AC from the ground station to keep the losses low and wire thin. I will need an additional about 1kg for the power supply.
So lets say 3kg of total payload.
I am little tight on budget here so I was thinking of buying IRIS and modding it to my requirement. But IRIS has a payload capacity of only ~450gm. And I think, after putting the camera and gimple it has none. Can an IRIS be modded for that kind of payload. I now an x8 configuration will be better from reliability perspective but its too expensive. If I have to build one. What kind of frame/motors/props should I look for.