Date: April 2015
This is an evolution of my previous designs but using a very rigid frame to get rid of any possible frequency coupling, and in any case minimize levels of vibrations. The design shows a 161Hz natural frequency of arms/legs against 80Hz of excitation (for a 1.5KgAUW). This design criteria is the oposit of most ususal designs having excitation above frame resonances (and harmonics).
This waranty that any increase of payload mass up to 3000Kg+ is well covered by the frequency gap. For 3Kg AUW excitation grows up to 108Hz, still well below frame resonances. The price to pay is a bit more of frame weight and mass (not too much), but it really worth!
It has been tested with both PID and QUATOS control very succesfully.
- Motors: TM3508 700kv
- Propellers: TM 12×4
- Arm tubes: 25mm x 1mm carbon
- Dry weight: 1.1 Kg
- Flight time: 25 min with 5000mA, 4S
- ACC levels < 1m/s2
Files for 3DPrint available to share. Send me a PM