"CF props have round(er) edges because carbon is very brittle, it doesn't hold an edge like plastic or metal does.
Graupner's carbon-reinforced nylon props' edges aren't sharp either."

"What's the wingspan? Assuming the cylinders are 100 mm in diameter and 1000 mm long, the total volume comes to some 15-16 liters. As a rule of thumb, one liter of hydrogen (or helium) offsets one gram of weight. So you'll be lifting 16 grams tops.…"

"Can't wait!"

"Looks like you have swapped the red and black wires on the twisted pair. You have the red wire going to the GND and the black one to the power pad."

"It would help with prop wash on descents in ideal gas. Real flow has turbulence below the craft no matter what you do. It's very easy to test - get it to hover and then get some smoke above it (visco fuses work well). You'll see massive vortices…"

"You might want to read up on Pendulum rocket fallacy and then remove that silly 10° tilt. You'll gain some extra flight time, reduce the complexity of your build and you won't be losing any stability. At all."

"Note that 868 MHz is regulated to hell in Europe - 10% duty cycle over an hour effectively cuts your max. 300 kbps data rate to 30 kbps average, making it useless for any kind of video."

"@Greg Dronsky, yeah! There are 10% hover time gains every single time. You can visualize what's going on with sound (no more sharp buzzing) and smoke - the intake part of the prop has air coming in slowly from a 180° hemisphere and exiting fast in a…"

"So what's the deal with obstructing a fifth of the prop disc with obscenely wide arms these days?"

"What's the reason for using an FPGA here instead of a libc-compatible 8-bit microcontroller such as AVR? Other than "that's all I had lying around". More expensive, more difficult to program and debug..."

"Excellent footage... what camera were you using on the night shots?"

"Chris: as others have said already, it's the certification that racks the price up. A transponder that isn't certified and sealed (and probably audited every year for a nominal fee) is as good as no transponder, because then it would be possible to…"

"It is a bad idea, even the slides say why. The transponder is a 1lb brick, costs in the neighborhood of 5 grand and when boiled down, this is just the Gov forcing people to buy a product of select few companies, nothing else.
And, as usual, those…"

"Unobtrusive tips (embedded into the splash screen) are a great idea - they've been used in all of the later Call of Duty games and worked fine.
90s style tips in individual pop-up windows are a waste of time - everybody turns them off on the first…"

"Sure could use a better gimbal though."

"Get a piece of soft fabric, some alcohol, and wipe that lens clean. It's ridiculously greasy on some of the shots. Don't touch it with KFC fingers!"