The basic criteria for this build has been:
- A flight time of 15+ minutes
- Capable of lifting a decent camera and FPV equipment.
- Enough left over power to have decent maneuverability and keep fun flying characteristics.
To accommodate this it turns out that you need to scale things up a bit.. to 11 inch props at least in order to get a decent trade off on battery weight and flight time.
I have chosen a large frame (660 cm) in order to accommodate the large props and give it more stability in the air. The motors are quite slow (970 KV) but generates a lot of lift with the large props without drawing unreasonable amounts of battery power. Its is expected to carry 2 battery packs connected in parallel rather than one enormous pack in order to optimize the mA / kg ratio.
This is the basic calculations used for the build. I have used the excellent calculator over at www.ecalc.ch. I can not stress how much this service has been worth the few dollars that it costs. If I had run with my own, rather naive, choices i would have ended up with overheated engines and destroyed ESCs in no time. Not to talk about the small inconvenience of the 27s flight time ;).
And the corresponding shopping list:
| Component | Name | Price (EUR) | Quantity |
|---|---|---|---|
| Flight controller | KK2 | 26 | 1 |
| ESC | TURNIGY Plush 25amp | 15.26 4 | |
| Frame | X666 | 15.68 | 2 |
| Vibration Damping | Vibration_Damping_Balls | 5.52 | 1 |
| Motors | GT2812/10 | 20 | 4 |
| Prop guards | 12 Inch Universal Multi-Rotor Propeller Guard | 4.08 | 4 |
| Propellers | Slow Fly Electric 11x4 | 3.52 | 1 |
| Propellers | Slow Fly Electric 11x4 (CW) | 3.52 | 1 |
| Power | distrubution Hobbyking Multi-Rotor Power Distribution Board | 1.69 | 1 |
| Battery | Turnigy 5000mAh 3S 25C Lipo Pack | 25.47 | 2 |
| Connectors | T-connectors | 3.2 | 1 |
| Lights | 6 LED Strip GREEN | 1.62 | 2 |
| Lights | 6 LED Strip RED | 1.62 | 2 |
So here we go! :)
