C/2020 F3 (NEOWISE)Made a photo of С/2020 F3 NEOWISE comet, making all the news now. Sigma 70mm F2.8 (@3.5), 60x2.5s (stacked).
After subtracting background - double tail became visible (dust & gas).
On mouse over - color, on click - annotation. Core is indeed slightly green
Got radio call sign : R2AYNAfter several years of listening to radio via SDR (1, 2) I am now officially allowed to transmit.
Exam was straightforward, paperwork took more time than theory preparation.
Initially I will focus on digital-mode radio (like FT-8) with DIY transmitters. Hopefully, I will be able to reuse some of my HF hardware that I was preparing for plasma experiments in vacuum.
Links for contacts: eQSL qrzcq
Edwards EXT255H turbomolecular pump - first run
It did not disintegrated itself I was surprised that it runs quieter than rotary vane backing pump.
Of-course it's used, came from disassembly of some science equipment in Israel. The only issue was 1 bend pin on a pump, which was probably not used. Anyways, I was able to straighten it up easily.
Ytterbium pulse fiber laser at work@1700W peak power. Visible light emission due to multi-photon excitation, non-linear effects. There is also some IR leakage through camera filter. That was a little bit scary.
Flying FPV - Beta85x
It took me 3 years of sparse attempts to start flying FPV. Finally it looks like I got it. At some point my brain rewired RC controls to helicopter flying experience in Battlefield 3 and it all snapped into place. What finally pushed it over the edge was reducing rates, enabling AIR mode permanently and getting 5 batteries (on such tiny quadcopters each battery lasts only ~3 minutes).
I compiled some of the first FPV flight attempts on Beta85x with some after 30 minutes of flight time:
PS. This is my second FPV quadcopter. I was flying first one (ARRIS C250 V2) visually mostly, and it was completely wrecked beyond repair in less than 20 minutes of flight time. It makes this hobby the most expensive one, if you calculate per hour expenses
Oxy-hydrogen torch @2800°C
Hydrogen flame at 2800°C melts glass like butter. Electrolyzer runs at 12V x 25A using 15% KOH electrolyte. Oxy-hydrogen gas is filtered through silica gel and fine air filter.
Observing SpaceX StarLink satellite groupUsing TLE from celestrak.com I was able to observe and photograph Starlink satellite group. They are visible in binoculars (10x50, 18x50), fly in sequence - dozens and dozens of satellites. Too sad I started to observe them only 5 days after launch, by now they've spread quite far already on their orbit.
Shoots are made using A7III + Sigma firstname.lastname@example.org (1/30sec, ISO 20000). 6 frame average, skipping 2.
Here we can see 4 Starlink satellites:
Here we can see 2 Starlink satellites and another satellite at higher orbit and different inclination:
Ducks do fly!In urban Russia we used to see ducks and swans not able to fly due to their trimmed feathers. Or maybe after generations of not flying there is no one to teach them fly? I wonder if a bird can learn to fly if it's parents never flown...
Here in Italy - ducks and swans do fly. But people say several years ago there were much more swans, probably they have flown away... Freedom comes with a price tag.
One can see these ducks learned a lot: how they increase angle of attack at landing to reduce landing speed, how they can land with or without thrust reversal (if they feel it's safe), how they neatly tuck in flippers in flight to reduce drag (reminds me of Boeing 737 landing gear)... They even have sharklets!