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I'm quoting the physics, not my own experience - and the physics is clear and indisputable. They'll fly, of course - the lift is proportional to the diameter, not the pitch. The consequence of blade stall (which will only happen near the root where the pitch is highest) will be reduced lift...

I could be wrong, but I think every time I mention JXF props from HiModel on this or any other forum, they go out of stock ;-)

I'm in Portugal, so I only know European suppliers: http://www.carbonscout-shop.de/CFK-Carbon-Rohr-gewickelt-16x14x1000mm-geschliffen-lackiert.html

Yep - multis like low pitch props because it's the swept diameter that produces the hover lift, not the pitch per se. The pitch (a.k.a. angle of attack) compensates for high speed inflow of air, like on a fixed-wing aircraft that's travelling at high speed. High pitch props on a multi will...

Depends if it's the silicon multi-strand that broke (in which case, sure - splice and get back in the air) or the motor winding wire itself where it comes out of the bottom of the motor(in which case you'll need to strip the shellac coating and effect a very careful twist/splice - really tricky...

14x8 is way too high a pitch ratio for hovering - they will exhibit "pitch stalling" - too high an angle of attack for the airflow over them. :)

What are these 16mm booms made of? "Break"? - as in: snap, crack, fold up, shatter? I'd agree they sound too thin, but really that depends entirely on the material and the wall thickness. I'd say that a quality 16x14mm pulwinded CF tube would be just dandy at 5kg. A cheapo 16x14mm pultruded CF...

In theory having higher pitch on the bottom should result in equal thrust from top and bottom. In practise a precise balance is probably impossible to achieve. But I think the pertinent point is that this is only considering a single moment in time. In practise the yaw is being controlled by a...

Not if you have different pitch for the lower props - then you'd need to find two different pitch props in both CW and CCW: difficult!

Fixed

Just for the record, the OpenPilot CopterControl can have the motors spinning in any combination you want. I agree though that all top one way and all bottom the other way gets the job done - and certainly makes prop sourcing a little easier.

Would one of you guys who are in communication with DJI care to ask them if a filter and a lens hood can be used? ;-)

I just did some fiddling in eCalc. I set up a 5kg (11lb) craft with eight motors, 4S power, 13x4.75 props on Axi 1814/22 motors. Why 13x4.75? Because that happens to bring the hover throttle to exactly 50%. Now if I change the motor count to "7" (all other variables remaining unchanged) the...

I suppose you could build yourself a "soak rig" - a hard-mounted motor inside a safety cage. Each new prop could be mounted, run for n hours at x rpm followed by a careful visual inspection. At the least, that would weed out the infant mortality factor.

Sure, but he asked the question - so he can choose between my reasoned answer or your "fuggit" approach ;-) Either is valid - particularly because of what ToniCH just added.

Good point :)

Gotta disagree with you on that one. Most (all?) plastics are affected by UV light, which will make the plastic more brittle. Plastic also exhibits stress deformation, fatigue and crack propagation in a similar way to metals. Plus they can be attacked by many chemicals (whether you apply them...

To add my €2-worth... The Avrotos, Torxpowers and Quadpowers are all definitely made by RCTiger. Whether they use the same winding, bearings, etc. I can't say. The top of the bell on the Avrotos is a different design to the RCTiger standard, but that's probably of no significance. I believe...

Good question - and I'm surprised nobody else seems interested in it ;-) Certainly I've never seen manufacturers in this sector quoting relevant figures. In general engineering terms, this is connected with MTBF - Mean Time Between Failures. As an operator, you have to decide the criticality of...

The DJI website quotes 2100W maximum consumption at 6S (22.2V) - that's just under 95 Amps! Where were you thinking of putting these EC5 connectors and 12AWG wiring? ;-)