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DreadLlama posted:Yeah but it'll mean an alternator which means (at least) a gas turbo and probably at least a bridge rectifier + small battery and a parasite DC circuit for running the cassette+whatever to run the speaker. And then also you've got a speaker hangining out of your fuselage, and also you've got to supply the extra thrust to lift said speaker. Why would you need an alternator? A big battery, a speaker and mp3 player somehow is insufficient? You could probably just hook it up in some big cargo type plane and that thing would fly for 30 minutes at half throttle.
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Mar 11, 2015 12:46
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I guess some radioshacks didn't move their expensive stuff over to the stores that were going to remain open
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Mar 11, 2015 17:35
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A Yolo Wizard posted:I guess some radioshacks didn't move their expensive stuff over to the stores that were going to remain open Holy poo poo. That is super cheap.
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Mar 11, 2015 19:45
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DreadLlama posted:What's the next-noisiest to a pulsejet thing that you can imagine flying? A flying lawnmower engine is still pretty noisy. Heck, quadcopters aren't even quiet. The cheapest per watt way to make noise is to use a small electric motor on a siren. At least, if my goal were noise, it's what I'd do.
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Mar 11, 2015 20:52
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Sort of obvious but a cool fact for DIY guys: I was pulling apart a DVDR/W drive for the rack and pinion inside and it turns out the entire laser carriage is set up on those rubber ball isolation mounts. I love opening stuff up and finding more useful things than you anticipated. also it turns out the laser carriage uses a worm screw to move  the drive tray uses a rack and pinion but it is way larger than I want. EDIT: Holy poo poo this thing is small, just came from the 3D printer:  That's a AA battery for scale. bring back old gbs fucked around with this message at 23:33 on Mar 11, 2015 |
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Mar 11, 2015 21:40
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Odette posted:Holy poo poo. That is super cheap. the one place that I actually found it is in the third wave of closings (up til march 31) and is still selling at 750. I'll try calling later
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Mar 12, 2015 00:41
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Did anyone else participate in international drone day? I went to an event in Clinton Ontario. Lots of people from the general public but not many pilots who were ready to fly in the large available space. The big guys only went up once for a few minutes. https://www.youtube.com/watch?v=yIoiOa-PXgQ I got in a bit of racing but the large group coming from out of town bailed due to weather so there was only two people capable of racing. Partway through I had an ESC fail when I armed the quad. 
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Mar 15, 2015 00:16
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Dang, that fucker cooked off good. 
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Mar 15, 2015 02:25
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A fully charged lipo with a convenient place to dump energy will do so at a very fast rate.
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Mar 15, 2015 16:14
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Is anybody who checks this thread familiar with any RC shops (ideally DJI distributor) in Salt Lake City, UT? I'm heading out there this week to take some aerial shots for a ski lodge and it would be nice to pick up some extra props and possibly another charger while I'm there.
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Mar 15, 2015 20:18
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can you parallel discharge / storage charge
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Mar 16, 2015 23:49
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Absolutely but make sure they are pretty close in voltage just like parallel discharge.
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Mar 17, 2015 00:05
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Can anybody provide guidance on troubleshooting odd flight characteristics of my quad? I built it on a 450mm frame, and am having trouble finding the correct battery size. A 3000 mAh battery lasts maybe 4 minutes before the low voltage warning kicks in. I tried a 5500 mAh battery about an hour ago, but ended up flipping it over on takeoff (it tipped right, not towards the battery). From what I could tell, the center of balance was within a half inch of center in both axes. Also I noticed when flying on the 3000 mAh battery, it kept 'twitching' while hovering - every couple of seconds it would tip ever so slightly and then recenter. It would also randomly decide to fly left or right in attitude mode. It does not hover well at all. I feel like it is overweight - in manual it seems neutral at around 60% throttle. But I'm not sure where I could lose weight (besides the landing gear and camera/gimbal, but that's the whole point of the quad). Here are the quick specs: 450mm frame DJI Naza V2 2209-980Kv motors 10 inch props 30A ESCs 1360g without battery Obvious next step is to take the landing gear and camera off and see how it flies. I'll do that this week when I have time, but until then, is there anything else I can look at? Any way to know if my motors are undersized or something? Here's a picture of the shitpile:  
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Mar 17, 2015 02:54
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Hit up Ecalc.ch to find the optimum battery. You might be able to find a better cell count for your particular setup as well. Found some more footage from international drone day in Clinton. I am the little orange guy having an R/C staring contest at the beginning. https://www.youtube.com/watch?v=I5ql6waqSsA
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Mar 17, 2015 03:15
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Life really does get in the way. I put in some more work on the QFO tonight. First, here's a link to my blog post: http://realtinker.blogspot.com/2015/03/the-qfo-gets-lit-and-space-becomes-issue.html And for the lazy, here's the highlights: I finished making the lighting boards low profile enough to fit in the arms.  That is a heck of a lot of very suspicious looking dust. Then I did a little soldering.  That daisy chain is long enough to reach into each arm, with a fair amount of slack. I then stuffed the lighting boards into the arms. I wedged them in with cardboard.  But it looks really good when sitting on the desk.  Annoyingly, I ran out of space in the airframe tonight. I think my next move is to de-pin the Flip32, and de-case my receiver. I'm going to go PPM, and run only the essential wires around the airframe. I should also order a FPV camera for this, I think I"m going to go with one similar to the one I bought for my RedBull 130x.
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Mar 17, 2015 07:36
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Wow, nicely done. I'm not a huge fan of yellow, aesthetically, but I can see how great a color it is when it ends up crashing somewhere.
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Mar 17, 2015 14:37
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Me either. I didn't actually get a choice in airframe color. It comes in red, and yellow. At least yellow won't show dirt as much as white would. Or yellowing of the epoxy. this weeks task, is ordering some white LEDs, and designing and ordering some PCBs to replace my hand made modules.
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Mar 17, 2015 20:41
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So this is pretty awesome. Guy took a Canon 6D and a Phantom 2 with a GoPro Hero 4 and made a really awesome video of Hang Son Doong, a massive cave. It looks gorgeous and the cinematography is pretty great.
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Mar 18, 2015 01:33
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T1g4h posted:So this is pretty awesome. Guy took a Canon 6D and a Phantom 2 with a GoPro Hero 4 and made a really awesome video of Hang Son Doong, a massive cave. It looks gorgeous and the cinematography is pretty great. My god this is gorgeous. Has vimeo always had such lovely compression though?
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Mar 18, 2015 02:45
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Laserface posted:My god this is gorgeous. To be honest, I didn't even notice any compression issues. But then I'm also used to YouTube which artifacts everything like crazy so I might just not see it 
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Mar 18, 2015 18:13
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Vimeo's video player seems to use a nearest-neighbor type of down-scaling. If you view the video at native resolution it should look a bit better.
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Mar 18, 2015 20:53
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http://www.reddit.com/r/Multicopter/comments/2ziwgr/how_did_the_current_crop_of_250_racer_frame/ Another person who doesn't understand the rocket pendulum fallacy. Is it that hard to grasp that the thrust from a quad is always in line with the body and therefore cannot maintain static stability? If you could just hang the battery down low why would be need these fancy gyros? https://www.youtube.com/watch?v=Tx4cjP-GRAY helno fucked around with this message at 03:58 on Mar 20, 2015 |
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Mar 20, 2015 03:51
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helno posted:http://www.reddit.com/r/Multicopter/comments/2ziwgr/how_did_the_current_crop_of_250_racer_frame/ Most people have no idea how much work the gyros do in a multirotor. I had a colleague who was totally shocked to see me have absolutely zero control of an aircraft with a failing IMU. Also gently caress reddit.
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Mar 21, 2015 01:29
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helno posted:http://www.reddit.com/r/Multicopter/comments/2ziwgr/how_did_the_current_crop_of_250_racer_frame/ He's a lot less stupid than your post here made him out to look like. The only point he's "off" on is thinking the weight under the quad will help in corners. reddituser posted:1) Centralized mass within the bounds of the quads motors. The tighter the better. Though he needs to think a bit more about how to make the frames better. I've been toying with a method to make 250 race quads.. a lot faster. That said, he also misses that most of what drives race quads is durability, rather than performance. So.. my idea? Make the fuselage a vertical wing. Stop leaning into turns. Just tip the quad forward, and pivot. Pivoting will generate side force without wasting lift energy. Obviously that will fall apart in the really slow corners, but for the fast stuff, you'd be way ahead of the game. The airfoil will also be a challenge, as it needs to maintain "around the same" center of lift at many angles of attack, and sideslip angles. Your airfoil will see oncoming air as sideslip as you tip the quad forward. My first thought was a disk, or an oval. Streamline the arms that hold the motors... I can't believe nobody is doing that yet.
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Mar 21, 2015 01:56
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Been getting a chance to get the planes out finally. Flew my night flyer assassin, hearing various replies from "that's awesome!", " it's a plane!" To "what the gently caress is that?!". Did a roll and loop to get the awesome comment. I think my next goal will be to scale back my ambitions for my Bix3 FPV plane. I'll aim to get it up in the air flying LOS, then get the GPS hold/RTH function working. With that working, I can fly up, put it in hold, toss on the goggles, orientate myself, then flip over to manual. Then I could fly back, toss it on RTH, and land LOS. Later I'll work on landing from FPV. Golluk fucked around with this message at 02:42 on Mar 21, 2015 |
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Mar 21, 2015 02:03
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Nerobro posted:He's a lot less stupid than your post here made him out to look like. The only point he's "off" on is thinking the weight under the quad will help in corners. I would describe him as argumentative rather than stupid. I was getting pretty annoyed when he kept explaining stability to me with examples that are firmly planted on the ground and have natural inherent stability which is not possible in a multirotor. He essentially kept parroting that the fallacy does not apply because in his opinion it is only applicable to rockets on a ballistic course. Most quads with the batteries on top are built like that to center the mass. Hanging it below will really move the CG away from the center of lift. And ironically it is easier to stabilize a system with the CG above the center of lift rather than below it because they exhibit two different modes of instability.
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Mar 21, 2015 02:27
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 Well great, guess I've got a 450 scale heli now. If I wasn't addicted before, I'm going to be in the following weeks This thing is pretty slick. Carbon fiber main rotor blades are pretty trick, and the DX6i it came with is a really nice setup. Can't wait to take it for a test flight tomorrow and (hopefully) not explode it into a bunch of tiny pieces.
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Mar 21, 2015 03:03
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T1g4h posted:
https://www.youtube.com/watch?v=gAYL5H46QnQ Just sayin' .. say hello TO THE GROUND .. ;-) CrazyLittle fucked around with this message at 05:29 on Mar 21, 2015 |
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Mar 21, 2015 05:13
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helno posted:I would describe him as argumentative rather than stupid. ... I should fly my quad tomorrow. T1g4h posted:
Pitch curve -2 to +80 ;-)
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Mar 21, 2015 08:58
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It didn't explode into a million tiny pieces! It was, however, still an expensive first flight. Shattered the main rotor blades, bent the spindle, ground a few teeth off the main gear, and lost a linkage. Lessons learned: The 450X is much, much faster and twitchier than my 120SR. By a large margin. And you need a lot more room to fly it, because it's way easier for it to accidentally drift into something and break stuff. But, I suppose that's part of the experience and it comes with the territory when you go from a fixed pitch micro to a full on 3D capable 450 scale setup. I'm pissed and frustrated with myself for letting it happen and for loving it up so badly on the first flight, but I learned a few important lessons. Next flight will be in a much larger, more open field and I'm going to see about adjusting the pitch and throttle curves to make it slightly less twitchy. For the very short time I had it hovering and flying, it was a glorious sight to behold and it made one hell of a noise. I'm hooked
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Mar 22, 2015 00:34
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I bought a little $30 Estes Quadcopter, I'm having a lot of fun with it.... I might now go buy a larger one.  
CommieGIR fucked around with this message at 02:58 on Mar 22, 2015 |
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Mar 22, 2015 02:00
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CommieGIR posted:I bought a little $30 Estes Quadcopter, I'm having a lot of fun with it.... I'm grabbing one of those after I do my appreticeship exam. They're loving adorable little things, and I figure it'll be a good intro to quads
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Mar 22, 2015 02:47
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I saw a thing that does pitch and yaw. http://www.hobbyking.com/hobbyking/store/__75930__HD_FPV_Camera_System_With_32ch_5_8GHz_Transmitter_and_Pan_and_Tilt_Function_Black_.html And I thought to myself, "The Oculus rift also does pitch and yaw. Does it exist yet?" Has anyone got head tracking to work with FPV gimbals? Surely I'm not the first person to think of this. You could probably get like a blimp and rent time on a VR spot to people over the internet.
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Mar 22, 2015 05:25
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T1g4h posted:It didn't explode into a million tiny pieces! See, this is where I think the 'bigger is better' theory when learning to fly helicopters falls apart. Yes, it might harder to learn it on a MCPX, but it's also an awful lot cheaper and quicker to repair 
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Mar 22, 2015 07:14
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ImplicitAssembler posted:See, this is where I think the 'bigger is better' theory when learning to fly helicopters falls apart. Yes, it might harder to learn it on a MCPX, but it's also an awful lot cheaper and quicker to repair I went with bigger mostly because while my 120 SR is fun, it cannot deal with wind unless it's about 3mph or less. This 450X has some weight to it, so I should be able to at least try and fly it most days, rather than having to wait for the rare windless days around here. I can deal with the increased price of the 450X crashes if it means I can get more flight time in
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Mar 22, 2015 08:18
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drat, all the low c, high density multistar packs are gone. maybe this would be a good time to learn how to build one of those li-ion packs. does anyone know the best place to purchase NCR18650PF (the unprotected kind)
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Mar 22, 2015 21:47
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A Yolo Wizard posted:drat, all the low c, high density multistar packs are gone. maybe this would be a good time to learn how to build one of those li-ion packs. does anyone know the best place to purchase NCR18650PF (the unprotected kind) 18650s can't be used to make li-ion batteries because they're not even the same battery technology.
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Mar 22, 2015 22:38
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Odette posted:18650s can't be used to make li-ion batteries because they're not even the same battery technology. are we arguing over terminology here or feasibility, because if its the former, then everything I read is calling them li-ion, and if its the latter, then using them to build larger battery packs is actually kinda well documented / discussed right now on rcgroups
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Mar 22, 2015 22:46
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A Yolo Wizard posted:are we arguing over terminology here or feasibility, because if its the former, then everything I read is calling them li-ion, and if its the latter, then using them to build larger battery packs is actually kinda well documented / discussed right now on rcgroups Really? Well, consider me happy to be proven wrong! I still wouldn't want to venture into that part of the hobby though.
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Mar 22, 2015 23:14
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Odette posted:Really? Well, consider me happy to be proven wrong! 18650s are definitely li-ion batteries (they're not li-poly, though, which might have been what you were thinking?). I've heard FastTech is a decent source for Panasonic li-ion cells, but be prepared for long shipping times.
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Mar 22, 2015 23:41
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