Here's my problem: I am working on an aircraft at the moment (the first I'm doing). Here its configuration: -DJi S900 -ZenMuse GH4 -DJI A2 -IOSD MK2 and a Futaba T14SG to pilot this. I've got a 6S Lipo 12 000 Mah battery. Do you think that this battery is good to fly during 15 minutes? The second thing is I want to secure the aircraft because i Heard about some bugs with the DJI A2, can someone confirm or infirm this? In order to prevent from a crash, I found out rescue systems to install on the aircraft as DJI dropsafe http://www.dji.com/product/dropsafe or this parachute rescue system from Opale Paramodels http://www.opale-paramodels.com/index.php/fr/shop/parachute-de-secours/parachute-drone/rescue-kit-for-dji-s900-detail. Never heard on these products, so I would like to know if there are some owners of those products, who can advise me about the reliability of these systems, just to know if it worth it or not! Thank you Cheers!
IMHO, you do not need a parachute.............and given the added weight your only going to cut down your flight time. If this is your first UAV, I would suggest getting flight time on a smaller less expensive model first. Spending $1000's on a first on is only going to lead to disappointment when something dose go wrong (and it will). As to the battery size, well without knowing the total weight of your UAV, the current draw of the motors, what propeller size, etc there is no way to guess what flight time you may get. Personally, I have built 100's of UAV's for my customers and private use. They have, and I have, lost a few due to some glitch, and a few from human error.......it happens. Most time we find them and repair the damage (if any) and go flying again. Adding the complexity and additional weight of a "recovery system" to me is a waste of time and money.
In fact, a friend of mine lended me his F550 a few months to learn some basics (even if it's only few compared to the amount of knowledge you need to be really efficient). For the Opale Paramodels system it's only 600g for a total of eight kilos. Do you think that will impact the flight time so much? Thought it could be interesting because of the cost of the total setup, protect people or animals that could be found at the bottom of the aircraft, or simply for your insurance lol and with the aircraft at 20 meters high to take pictures I think it is enough time to deploy the system. For the battery size, I have a total mass of 8kilos, E600 motors. I was advised a 22 000 Mah battery to reach my flight time time, even though it doesn't matter if it's 13 or 14 minutes.
E600 SYSTEM Recommended Load 600 g/axis Maximum Thrust 1600 g/axis Working Temperature -5 °C ~ 40 °C Recommended Battery 6S LiPo Units Per Package Quad or Hexa Quad or Hexa ESC Current 20 A OPTO Signal Frequency 30 Hz~450 Hz Voltage 14.8 V~25.2 V Battery 4S~6S LiPo MOTOR Stator Size 35×8 mm KV 415 rpm/V Weight 90 g ROTOR Diameter /Thread Pitch 31×11 cm 12×4.2 inch From those specifications I calculate that you do not have enough power to even hover.............it weighs too much as it is if your real weight is 8 Kg...5Kg would be your maximum weight for that UAV. I used http://www.ecalc.ch/xcoptercalc.php to calculate the above. Yes I saw that DJI claims 8.2 Kg max but they do not state the test conditions..... Seriously, too big of a UAV this early and with your experience in flying................but good luck
