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Arthur P.

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About Arthur P.

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  1. Not my project but might be of interest to the Graupner MX12 / JR .... 6 channel radio users: adding two channels to this TX using an ATtiny processor and some code: http://forum.mikrokopter.de/topic-4405.html
  2. Hi Vic, Sorry about that. Haven't looked in that forum for a long time. I thought they did have a bit of an international section. There is currently a new UAVP parameters thread in www.RCGroups.com under Aerial Photography. If you post your question there, I expect you will get confirmation quickly.
  3. You could also do a search for DX6 and AR6000 in the forum on http://www.uavp.de/ . It is one of the frustrating forums where you have to register before being allowed in. But it does supply a lot of info on the UAVP system, and will get you a lot of support if you post quesions there. I don't believe they're too strict on the use of German.
  4. Hi Victor, I didn't check completely, but I think you're pointing to the same set as the US shop is offering. I expect you'll have it quicker and with less hassle with e.g. customs when you order there. And it will get you English language support from them.
  5. -AT-Victor, Assuming your located in the USA: http://www.quadroufo.com/ Look under Flight Controler for the populated board. I would suggest that you check with them whether you an use the AR6x00 and/or AR7x00. I believe the UAVP had problems with the latter due to the unusual sequence of the channels. Also check whether the ESCs you want to use will work if you want to use PWM control. You can of course use Holgers, YGExxi-s, or converted TowerPro 18A, 25A, or 30A ESCs over I2C/TWI. Note that there are two threads here on UAVP and/or Mikrokopter under Floobydust. E.g. http://www.rc-cam.com/forum/index.php?showtopic=2524.
  6. And a closeup.. Of note, I would really urge anybody who has TowerPro type 2 like ESCs (with the BEC on a little satelite PCB, as used in the type 2 and 3) to check the FETs. If they are those used in the type 2, as I call it, either replace the FETs or the ESCs as soon as possible. In any case ensure you use type 2's at loads of 10A or more, ensure forced cooling, and avoid accidental blocking of the prop. BECs 7805's stacked up on main pcb = type 1, no overheating problems. BEC on breakout board and hot TC8114/TC8111 FETs = type 2, can seriously overheat. BEC on breakout board but different FETs TPC8107 und F8113 which don't seem to overheat at all on my 11min flight = type 3 Best to replace the TC 8114/8111 with better alternative Si4425. Quax has done that and it solves the overheating problem.
  7. That toy is the standard X-UFO with a mechanical gyro. Not very stable for more than a minute or so. It has taken quite some time, but I have two of my four APMk's (Aerial Photography Multi-kopters; but also derived from my initials ) flying since last week. First outdoor testflights ocurred with winds gusting to 45kmh, no problem. APMk nr 1 has Turnigy 2213/20 motors and EPP1045 props, RTF weight about 1350g, will fly a bit over 6 minutes on a 2150mAh 11.1V lipo. APMk nr 2 has Turnigy 2217/20 motors and currently still EPP1045 props, RTF weight about 1550g, will fly a bit over 11 minutes on a 4000mAh 11.1V lipo. For the smaller motors I will have to get the RTF weight down to well below 1000g, probably somewhere in the 800-900g range. APMk nr 2 really isn't breaking out in a sweat with those mid-sized motors. I-ll probably also try GWS 10x6 three bladed props and maybe even APC 12x3.8 SF props on those to see what gets me the best balance re performance. In addition, weights above 1500g are a bit high for the frail EPP props. I did have a bit of a fiery adventure with APMk nr 3, with four HYX3542C motors, 5000mAh 11.1V lipo, and APC-E 12x6 props cut down to 11 inch. RTF weight of that one is about 2150g, but with max thrust close to 2000g per motor, that should still allow quite some cargo. Problem that occurred was that on first testflight, after rising 1.5m without any problems, on going into a hover, one of the motors suddenly developed extreme vibrations, the axle going back and forth up to 2cm !! Emergency landing resulted in a tipover, causing two props to be blocked. Before I had righted the craft the two involved ESCs were on fire. How's that for special effects.... Besides the turned burned ESCs no further damage to motors and electronics. Cause of the very quick burnout was most likely that these motors can handle up to 45A while these TowerPro 25A ESCs, type 2 with "hot" FETs which can rapidly overheat on low loads, of course should not go beyond 33A max for just a couple of seconds. Cause of the vibration was most likely resonance vibration of the 4mm thick plywood motor-mount. All four motors show roughly the same behaviour, with no vibration at any throttle setting with the props turning in the wrong direction, but sudden vibration between 1/2 and 2/3 throttle when turning in the normal direction and thus pulling up on the motormount and arm. The severity differs a bit with two motors showing extreme vibration, one of which had already caused the motormount to start splitting. So time for a stiffer, thicker mount, before going for a next test flight with heavy APMk nr 3. More details and pics in the RC Groups aerial photography forum, in the Multikopter build thread.
  8. For some reason they don't want to guarantee shipping outside of the US and Canada. So here I am with my high Euro/low Dollar and I can't even buy US stuff (even accepting excessive customs taxes in the bargain)..... Guess I-ll have to wait until united have them back in stock ;=))
  9. -AT-Labmaster, That replacement receiver is really impressive !! Certainly deserves a separate thread ! Btw, where do you order your satelite receivers from?
  10. Very ingenous and very impressive Richard and Mr Cam-Man !! Actually, I believe the 2 second delay is in part due to the FC settings. At least in v0.68d the default delay in the MKTool is 20x 0.1 seconds I converted 8 new TowerPro 25A/2's on Sunday afternoon, am back to just quickly soldering the programming wires to the right legs and then removing them. Those are actually so easy, that it takes about as long as the multiple attempts needed to position the clay programming adapter. Overall time for conversions is down to about 45 minutes per ESC from starting to put on the battery connnectors to finishing up the new heat-shrink with in between connecting the programming wires, reprogramming for the correct motor, removing the porgramming wires, drilling through the existing incorrect route, checking correct resistance, rerouting one port, rechecking correct resistances, making an 3-wire TWI servotype connector, going from servo wire to wire-wrap wire with heatshrink isolation, connecting the SDA/SCL/GND lines, shortening the normal PWM connector wires so that the plug can still be used to power LEDs off of the BEC, testing the ESC over the TWI interface, putting a few dabs of epoxy over the new connections to fixate and isolate them, heat-shrinking the ESC back up, and retesting one final time. Not bad, looking at the number of steps I also modified the landing gear on all three APMk's by putting 3 6mm carbon rod braces horizontally between the legs about 5cm off the ground (along the sides and behind the camera, putting on carbon 6mm carbon rod "skids" on the bottom of the legs, and wrapping "pool-noodle" type pipe isolation around the skids with the rear 15cm coloured red with marker pen. Connections are made from 6cm pieces of 8mm plastic tubing with a small hole cut in the side halfway in the length (just bend the tube back on itsself and cut off a small corner). Adds just a few grams and has tremendously stiffened the landing gear with better distribution of forces over all four legs. I-ve testdropped the heavy APMk 3 (about 2 kg with battery) on the landing gear from about 20cm, no problem. And I think the skids with the rear 15 cms being red, will help with orientation. I also modified the camera mounts by putting a little block of wood below the gimbal ring so that it only swivels sideways. The FC can control the tilt correction very nicely, so no need to have gravity do that. On less axis of free uncontroled swinging
  11. Actually I have the FC ready and the parts all lined up for APMk nr 4. Got stuck with an additional one on a group order. I-m going to use that one as "experimental", i.e. for testing different frame improvements, new firmware, etc. Motors for that one initially will be Turnigy 2830 - 1050kV, so it will be a "lightweight", but may get 4 more and go for an octocopter on that testbed ;=)) The ESC on motor 1 of the heavy APMk nr 3 has me stumped. All connections are intact. The motor arms correctly with the nice Quax tones. But it isn't responding to I2C/TWI throttle commands at all. I-m considering trying to reprogram it (maybe it lost it's address??), or just convert a next TowerPro 25A ESC, and only then reprogram this failing one as a "spare".
  12. Well today was "the" big day, the first outdoor testflights. Conditions were "near perfect": 8 degrees Centigrade, heavy overcast, and winds gusting to 45km/h (about 30 mph) But in view of the good stability the machines had shown during some indoor handheld testing, I decided to just go ahead. Of course all did not go completely as planned. APMk (Aerial Photography Multikopter, but also a jab at my initials APM) nr 1 had a wrong and incompletely charged battery, so only several short hops, but still it managed the wind quite well, immediately hanging into it as soon as it got light on its feet. APMk nr 2 had a bit of a thump after the first hop due to my twitchiness on the controls and "lost a leg". But on a bit of a little slope it was stable enough on the remaining 3 to still do some more and increasingly long "hops", even going up to about 10 meters. And with a bit more weight, even more capable of handling the gusting winds. Really amazing. Only APMk nr 3 didn't make it into the air as motor nr 1 wouldn't start for some reason. All three have the Spektrum AR7000 on board, with the PWM2PPM v.2 converters. Work excellently !!! Thank you !! More pics and details here: http://forum.mikrokopter.de/topic-1023-2.html and here: http://www.rcgroups.com/forums/showthread....121#post9312892
  13. Little update from my side: as those following the thread in 'RCGroups.com / Aerial Photography / Multikopter build thread' know, I-ve had a few setbacks along the way which resulted eventually in having 4 flightready Mikrokopter flightcontrollers, multiple sets of converted TowerPro ESCs, and Richard's v.2 of the PWM2PPM converter to be able to interface the Spektrum AR7000 to the flightcontroler. I still have to finalize wiring up the PWM2PPM converters today, but I should have 3 APMk's (Aerial Photography MultiKopters, or in a pun at my initials Arthur P M's kopters) ready for test-flights sometime tomorrow. These three all have the same frame design with rapidly removable motor arms with integrated LED lighting (using the BECs on the ESCs), 25cm high landing gear (6mm carbon rods), 2mm model-building plywood frame (19cm diameter), and 2mm model-building plywood gimballed self-leveling camera mount with tilt servo. They do have different motors: Turnigy 2213, Turnigy 2217 and HYX 3542, and thus different ARTF weights (estimated from 1300 to 2200 grams including camera). Current frame hub is rather high, with a battery bay large enough to house up to 2x 4s 5000mAh Lipos. On the 4th frame I-ll be changing that a bit, reducing the height of the hub from just over 15cm to about 12.5cm and improve the way of (dis)mounting the landing gear. Whole frame should be packagable in a small box, about 20x16x40cm large, and assembled within minutes at site.
  14. Sorry about that Richard. It was indeed late, and it indeed concerns your v.2. PCB. I-ve corrected it in my post above (but can't correct the quotes which still call you Jim).
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