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Everything posted by moonomaly

  1. Finally got to grips with my cheap Chinese 3D printer and am making proper end caps now, should be usable this week.
  2. https://dailygalaxy.com/2019/05/suns-11-year-cycle-powered-by-tidal-forces-of-venus-earth-jupiter/
  3. Having watched some youtube videos of the stars through night vision devices i wanted to do the same and see it for myself, the light-gathering power of the P8079HP is impressive, the manufacturer's manual says it multiplies incoming light by 100,000. Some specs on the tube here from the manufacturer's manual : https://www.dropbox.com/sh/rnnkvasq5t6o2dy/AADmr9Ftu9FrdnRR2OohXQJpa?dl=0 It takes from 5 to 6.75 DC at 35mA max in my experience though the manual says 50mA max, these tubes are old so mileage varies. To use it as a stand-alone unit it needs an objective lens in front of the input and an ocular/webcam/video-device-of-some-sort plus power to the device, usually in the form of an AA battery or project box with a switch, and maybe a power LED if you're feeling fancy. A few people have built some very nicely finished units, this thread is informative and has lots of photos, though most of it is to do with using it for hunting : https://www.ar15.com/forums/Armory/DIY-Cascade-Tube-Thread-/18-359614/?page=1 I've been putting my one together, i'm gclarke66 on that thread, the most recent post since it's a fairly inactive thread.
  4. Thanks for replies, ended up getting a raspberry pi plus the IR camera. I was hoping i'd see something in the sky but i've seen nothing, i suppose the sensors are short-range, should probably read more before embarking on these projects! What i have been wanting to do for years is skywatching with night vision, i finally bit the bullet and got one of those P8079HP NV cascade tubes, it's nearly done, will post a thread on it. Cheers and beers
  5. Lots of videos on youtube, mostly using a 35mm film tube for a housing but i can't find one that's about removing the IR filter AND attaching to a scope. I opened up my logitech C270 webcam but the filter is part of the surface-mounted CCD chip so i'm not touching that, i need one where the filter is part of the lens assembly so that it's easily removable, or even breakable, but also one that is easy to fit to the star diagonal. Any advice/experience/failure stories greatly received
  6. Were the Orionids busier than usual this year? I can't find after-reports but a few of my friends saw more than one, which is unusual judging by what pals have seen in previous years here in Leicestershire.
  7. Ah, thanks rocky, i get it now. I have to read up on the basics of it all, so much i don't know!
  8. Yes, i spent ages trying to dissuade flat-earthers and the like but they seem to be willfully ignorant, and don't get me started on Nibiru and 'second sun' channels, they end up blocking me!
  9. Well i thought i'd ask the experts I still don't quite understand though, i understand about the secondary mirror,but i don't understand why the dark disc stays in the centre of Mars when the telescope isn't moving, i woudl have thought it would appear to edrift to the left as Mars moves to the right?
  10. If it is an obstruction, i'm wondering why it moves with Mars and not his scope?
  11. I think he's just looking for mysteries and seeing what he wants to see. I love mysteries but there's nearly always an ordinary explanation for them.
  12. An amateur astronomer has a video of Mars but there's a dark circle in the middle of Mars. Ignore the UFO in the title, he admits he's not experienced, it obviously isn't a UFO (or an asteroid as he says at one point!) since it moves with Mars, so it must be some kind of optical effect ?
  13. I was wondering about how it would be done programmatically and then stacking came to mind, his hardware setup is pretty busy!
  14. http://www.richardgregory.org/papers/telescope/technique-minimizing-atmosphere.pdf
  15. Yes i think you could beat 1M. I know how long it takes,i started manually, then i built a jig operated by electric drill, then years later i bought this freom ebay : http://lechacal.com/wiki/index.php/Albawinder
  16. This is why i'm so keen on investigating the ion-wind effect. Different groups in NASA have reported different results, there is a fair bit of disagreement about exactly what's going on, and non of the big boys (that i can find yet) have produced a paper detailing stringent tests comparing observed thrust with predicted aerodynamical results. Eyeballing some net videos of previous experiments there's no way that such an imperfect aluminium 'wing' can produce the thrust required to lift the frame, here are some experimental calculations from other experimenters : http://blazelabs.com/ http://jnaudin.free.fr/lifters/main.htm
  17. Great thread, love that amazon unit, a larger version of what's inside plasma balls.
  18. Loving the wireless power transmission, something MIT bragged about a few years ago, like coil-builders didn't exist and hadn't done it already! The 'toy' one is nice and decently-priced, your big one looks a little too close to your telly and hifi for my comfort ;+} Lovely work pal, nicoe coil, how did you wind it ?
  19. Could be done with easily available parts, or custom boards, depends what you want it do do once it's up there ? Don't be out !
  20. That's interesting, sounds like it may be the same effect at work. Was it a doughnut top ?
  21. Problem 1 - Propulsion, intro. Having looked at available methods, none suffice - we can't take fuel on our microsat, we can't use electromagnets since they stop working once we are too far away from the Earth's magnetic field and we can't store enough water to use microjets as a propellant. What about electricity? One technology that i think is worth exploring is the so-called 'ion wind' effect, it comes from early experiments with asymmetrical capacitors and is a field with plenty of room left for exploration by domestic researchers. Standard capacitors work by creating an electric field between two plates, storing energy there. It's been found by experiment that when one of the plates has a different form from the other (thin wire vs thick wire, or small surface area vs large) that a net thrust is generated in the direction of the smaller plate. A simple model that shows this effect is the famous 'lifter' model, basically a trianglular (or square, or more sides) balsa wood frame, with an aluminum skirt and a very thin copper wire. Ths skirt is mounted on the lower part of the frame and the wire on the higher, here's a starter experiment (please rewind to start since i pasted video at near end) : These are high-voltage (HV) devices, so to reach 30kv can typically cost you a few of amps of current (when we step up voltage output, current output goes down so we need lots to start with), and power sources that produce enough current are prohibitively large. So, in order to develop a micro HV transformer we need to explore different materials and topologies to find the most efficient model. Some apparent experimental behaviour i've collected about lifters from available data (the thin wire being the emitter and the aluminium skirt being the collector) : 1. smaller gap = larger force 2. more collectors = larger force 3. larger, single collector = more force than 2 4. more rigid aluminium sheet = larger force (smoother surface?) 5. smaller emitter diameter = larger force 6. effect works when emitter is in a vacuum 7. pulsed power improves by an order of magnitude at least (sawtooth wave seems best) 8. pulsed ac is apparently better 9. more current = larger force 10. increasing AC voltage results in a nonlinear increase in the force I've been meaning to start experiments to prove the assertions in the above points 2,3,4,6,7,8 and 10 but i've only just got the test-bed near readiness after 8 months so progress will be slow.
  22. Next week please! Seriously though, that's one of many questions yet to be explored, navigation, telemetry etc. Need to start off with formulating a propulsion system that will generate enough force and fit into a cube or tubesat, so the first step is to prove that simple ion thrust devices generate more thrust than airflow alone would achieve. Baby steps.
  23. A thread for thoughts on launching a cubesat or tubesat (micro-satellite) in low Earth orbit (LEO), and then sneaking off to the Moon instead of decaying back to Earth : Launching the sat for $8K-$15K (£6k-£11.5K) : http://www.interorbital.com/Cubesat Kits http://www.interorbital.com/Tubesat Kits First problem is leaving LEO, second problem is navigation.
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