Svarichevsky Mikhail - RSS feed Svarichevsky Mikhail - RSS feed en-us Tue, 10 Jun 2006 04:00:00 GMT Sat, 19 Sep 20 23:22:43 +0000 120 10 <![CDATA[C/2020 F3 (NEOWISE)]]> body:after {
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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
Mon, 20 Jul 20 01:26:20 +0000
<![CDATA[Tesla coil x2]]>

Tue, 25 Feb 20 05:29:16 +0000
<![CDATA[Got radio call sign : R2AYN]]> 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
Tue, 04 Feb 20 21:05:30 +0000
<![CDATA[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.

Centering ring was grinded from one side to allow use of sheet of glass instead of vacuum chamber to see the rotor during first test run on nominal speed (60'000 RPM):

EXDC160 controller:

Was recording video for the chance of capturing rapid unscheduled disassembly, so not much is happening on the video. At 3:53 - roughing pump is turned off to hear the sound of turbo-molecular pump. With such small "chamber size" venting without exceeding maximum pressure rise rate is quite challenging - hence venting and slowing down the pump took much more time then start-up.

Update: Could not resist taking second one from the same seller as a spare, also works fine:
Mon, 16 Dec 19 06:58:56 +0000
<![CDATA[Ytterbium pulse fiber laser at work]]> ]]> Sun, 28 Jul 19 10:54:20 +0000 <![CDATA[Ferrofluid fun]]>

Sat, 20 Jul 19 12:56:32 +0000
<![CDATA[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
Fri, 05 Jul 19 09:00:28 +0000
<![CDATA[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.

Flame of filtered and dried gas is nearly invisible (it emits light in invisible UV). Had to turn off the lights to take a photo:

Torch is modified to have 45° bend at the end using standard compressed air parts:

Electrolyzer with 25plates is configured for 12V operation for now (will switch to 48V later).

Update: Melting gold with it:
Mon, 24 Jun 19 01:00:14 +0000
<![CDATA[Observing SpaceX StarLink satellite group]]> 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 135mm@1.8 (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:
Wed, 29 May 19 23:36:10 +0000
<![CDATA[Ducks do fly!]]>
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!

Tue, 14 May 19 23:18:22 +0000