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Of course there does have to be a limit but in this instance the criteria on that limit are poorly defined and punitive to electric craft. The world of cars and trucks has had this one sorted out for many years: Weight-based divisions of UAS should be based on the gross weight of the aircraft -...

My next build is going to be a sub-7kg turbine-powered, belt driven multirotor with a HUGE fuel tank - should be easy to get to a take-off weight of around 30kg ;) But, of course it will be MUCH safer than a 7.1kg electric machine.

Thanks for finding that - but it is still only an "informational statement" not actually written into the ANA and therefore not part of the enforceable regulations as far as I'm concerned. You're right, of course - 7kg is a really awkward weight limit for a camera ship. That's why I'm kinda...

Sorry - what's the "Resource Group"? If this distinction is not actually written into the regulations then it holds no validity. As is so often the case in government matters, personal interpretations are laid on top of ambiguous/meaningless regulations and propagate as "fact" when they're not...

Yeah - this smells to me like an on-the-fly interpretation by one individual at the CAA. To my mind, unless the ANA clearly states otherwise then the battery packs (being the direct equivalent of "the fuel") are not included in the "7kg (without fuel)" definition. Furthermore, if the ANA is...

Yep - I can find statements from private individuals, but I cannot find anything in the CAA documentation that confirms this. Furthermore, I can see no valid logic in classing a Lipo as a "fuel tank" and the "stored charge" as the fuel. Given that the regulations are aimed at safety and 7kg has...

I've been searching the available documentation for an answer but cannot find a clear statement: does the 7kg limit include battery/fuel? The 20kg limit definitely does NOT include battery/fuel.

eCalc is pretty accurate IME, so long as you have the necessary data for the motor. But eCalc can't give any answers for a coax setup, for obvious reasons. And, by the same token, a database of accurate motor/prop data will only be applicable to flat layout MRs. Just my 2 cents.

Andrew - you want volunteers to compile a database so you can gain commercial benefit from it?

It doesn't make much sense to runner SMALLER props on the top motors. Normally one would be putting higher pitch of the same diameter on the BOTTOM in order to even the workload. The higher temperature of the top motors and ESCs indicate that they are doing more WORK than the bottom ones in...

It may be... but: without objective data to suggest a more realistic interval, and since I rebuild the machine after 30 flight hours, it's convenient (and cheap) to change the caps during that exercise (as well as the bearings, the power connectors and most of the power wires). I don't think...

That's what I'm hoping you can tell us :) Just common sense :) A few pages back it was suggested that temperature should be the focus and I'd agree with that: temperature is what destroys the caps, thereby exposing everything else to danger. Observing voltages may lead to an understanding of...

econfly - I appreciate what you're trying to do but I believe you're defending the wrong hill: your suggestion is that there's no need to change capacitors unless objective data proves otherwise. Simple knowledge of capacitors and their issues suggests (to me) the exact opposite: you should...

There's plenty of anecdotal evidence that capacitor failures bring down aircraft - plus one's general knowledge that capacitors deteriorate and die. In this application the capacitors are worked hard - very hard. So it entirely makes sense to replace them on a regular basis.

No objective data, just a low-cost precaution. I chose 30 hours to coincide with the rest of the maintenance schedule: complete strip down and rebuild @ 30 hours. The caps keep the machine in the air, so why skimp? ;) Glad to report not even a hint of glitch in over 100 hours logged hours so far.

Yes - those linked are good. I buy from Mouser UK: http://uk.mouser.com/Panasonic/Aluminum-Electrolytic-Capacitors-Leaded/FR-Series/_/N-1yzvjj0Z75hqwZ1yzv4gr. Datasheet: http://www.mouser.com/ds/2/315/ABA0000CE132[1]-293385.pdf AFAIK there's no problem with over-specing the caps, only...

Great info here :) Couple of things to add: Capacitor Voltage Rating: the higher, the better. The cap is having to deal with the induced voltage peaks, so higher voltage rating will be able to do that better. My rule of thumb is to use double the battery voltage. Capacitor Count: the caps...

Ah - Bart's definition of "a troll" again: anyone who persists with a position contrary to mine. Bart - you really must restrict yourself to one role or the other - either be the owner/arbitrator of this forum or participate in it as an individual. You can't seem to manage both.

The article fails to mention one of the most important factors: that the FAA is behaving/thinking as if they are the first regulatory agency in the world to address this technology and that the US airspace is somehow "unique". :)

Unfounded? Over-dramatized? Inappropriate? Let me paste in here the words that seem to have got you so riled: Please point out precisely what is unfounded, what is over-dramatized and what is inappropriate in there. Note also that it does not express an opinion, per se - it's only a...