"@Essam Your operating altitude is going to depend on the field of view of your selected lens. If you need the camera to capture a single image to cover 120 acres, and your lens has a 38 degree viewing angle, my maths say you'll need to fly at…"
"Did you run your design through ecalc.ch? I think you've got a good power system design, although I don't see your specific motor on the site. While ecalc is known to be pessimistic when it comes to its calculations, especially with…"
"From a practical standpoint, there's minimal difference between a 10x4.7 and a 10x4.5. According to ecalc, the higher pitch would increase the power per motor by a whopping three watts.
Going the other direction, reducing the pitch from 4.7…"
"You may wish to examine the Roswell Flight Test Crew's setup for their demonstrator hexacopter. A recent "viewer response" Q&A video outlines the expenses involved in that particular project. Short version, if the manufacturer…"
"Looking through the logfile you provided, I'm seeing ERROR messages for subsystem 5, which is the throttle failsafe. Since you say the problem comes up when you're flying at a high forward speed, I'd start by checking the wiring…"
"Randy Mackay has a good YouTube video on the pre-arm checks the APM goes through in ArduCopter 3.0 and later. I'd suggest you view that video, then look at your log files the way Randy did and see if there's something in your configuration…"
"Marc, if you're completely new to flying quadrotors, I'd strongly suggest you start by learning to fly one of the small ready-to-fly aircraft on the market, e.g. Traxxas QR1 or similar. Multirotors are typically more stable than…"
"The people who are opposed to UAVs, UAS, or drones have some very real and valid complains regarding WEAPONIZED UAVs and UAS. Unfortunately, due to the valiant efforts of the American media to convince the public that those are the only uses…"
""Voluntary guidelines" are exactly what both AMA and SUAS have tried to put together. The problem is that first word: voluntary. The evidence, such as it is, points to someone not thinking those guidelines should apply to them. And even…"
"AC 91-57 is a guideline, this is true. However, AC 43-13 is ALSO a "guideline"...one that aviation mechanics are required to follow in order to obtain their certificates as aviation mechanics. The FAA can, and does, fine persons who…"