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Everything posted by kd7ost

  1. For what it's worth, Lipo batteries perform pretty well in the cold. So do Nimh. Not Nicds though. As they get colder they can't spply the higher levels of current needed for max on your motor. I wouldn't think there should be a problem with the lower current draw of the AV system. Dan
  2. You might concider one axis on the camera, and one axis on the craft? It will be easier and the craft will already have yaw capabilities I presume. (Pan) Dan
  3. I like that idea. We've also been talking about the "Way Point Sequencer" on the other site. What I would like to see is the ability to have an altitude lock as you describe. Couple that with a GPS enable type device. In this case you aren't loading in waypoints, but the electronics is looking at Lat and Lon from a GPS. You can fly via RC and Video link to a specific location to photograph or observe. Once you manually fly to a location where you want to loiter, enabling the device will lock in the altitude as well as cause the plane to start to loiter around that location. It would stay that
  4. A full scale pilot also has and uses trim tabs to help in flight to balance keeping altitude, speed and pitch setting where they want. I find in my UAV style plane, with a fair amount of adjustment and tweaking the setup, that full throttle causes my plane to climb. I don't have to touch the elevator once I have rotated. It will continue to climb but no tendency to stall until it were to run out of fuel or lift. Then watching the video Link and GPS overlay altitude information I know that by adjusting my throttle I can get the altitude to stay reasonable steady where I want. At this setting
  5. I'm embarrassed to say I have a few of those chips programmed up but never used. One of each two flavors in fact. It seems like the Helicopter guys would use them the most. Where there are two operators. One for flying the machine and one for flying the camera. At the time I was designing my early UAV and thought I needed pan and tilt in a camera pod. I had a buddy of mine at HP download the files and program them for me. In the end I use a standard Futaba 9001 servo for tilt, and my rudders for panning. It’s a lot less complicated and allows me to be the camera and aircraft operator both.
  6. OK, then it's like you said, it just hasn't made it that far yet. It seems as if inertia was making it overshoot, then it would stop and then move the oposite direction to come back to where the pulses are telling it to be. It might simply be that with a well balanced unit you could get away with using a servo like one of these 1/4 scale versions. http://www2.towerhobbies.com/cgi-bin/WTI00...L=++&search3=Go Best of luck. Dan
  7. Does the pencam chip continue to put out pulses based on last position information though? Or does it stop putting out pulses when you aren't moving the stick? Dan
  8. Bummer. Drats is right. Sounds like you pegged it though. So in this case, it sounds like the transit time for the servo is too slow. Having pulses stay there will certainly prevent overshoot from coasting the gear train. Can you increase the gearing any in the Robotzone device? Maybe you can try a high speed servo to raise the transit time. Do you need the full 90 degrees of motion in the servo unit? Maybe changing out the potentiometer to a different value, or simply adding some fixed resistors on the ends of the pot will provide less motion but increase the response time within th
  9. Oops, So much for my idea then. It sounds as though you already have a handle on the HD parts. It sounds like the 5 pounds mass of the camera, is keeping the servo in motion through inertia. The increased gearing is giving the mass an effective longer lever arm. I don't know the panncam device, but it sounds like when it's time to stop motion, center stick, that no pulses are being sent. What if you try to operate the camera/servo device right off the receiver? Put in on a channel with a stick that spring centers and see if it stops it when the stick is centered or if it overshoots.
  10. You might consider changing servo's too. You may already have it nailed down but servos like the Airtronics 94738, Futaba S9405 et al are high resolution, lower speed and higher torque mechanical devices. They use coreless motors and metal gear trains. You might also look at the products from some of the robotics mechanical companies. Take a look at servo modification projects from http://www.servocity.com/ These slow down the mechanical action, and increase the torque. The servo city parts would allow you to use a servo like the Futaba S9001. There are other servos that will work too. I just
  11. Here's a hardware mod if anyone is interested. Dan http://mypage.yhti.net/~dmcdnld/s148retract.htm
  12. So the 4015 can be used as a level shifter? You just gave me an idea. Would the 4050, noninverting Hex buffer, do the same thing for up to 6 channels? Any idea if there is a single chip that would do up to 8? Dan
  13. Mmmmmmm, food grade servos. There are a lot of options. There are some that are pretty well sealed. How much torque does the servo need to have? I'm sure the arms will be supported on there own with the servo just doing the motion part. Servos come in many price variations too. Do you have a spending limit on such an ambitious project? Dan
  14. Maybe the contact information you're using is outdated. Try this one. http://scalerobotics.com/store/catalog/ Radiohound is part of an active group holding pretty much daily discussions about the RCAP development. He has been very available to us. Check this thread for the latest. http://www.rcgroups.com/forums/showthread.php?t=484568 Join in over there. We'll look for you. : Dan
  15. We have to stop looking to the PDC-10 guys. I tried my best please, please, please, to UNAV but the deal isn't on the table. It's a pragmatic business decision and I respect them for it. The code represents a great deal of intellectual property and much of it resides in their new Pico pilot. The owner told me the PDC-10 represents a lot of work and effort for just too little in return from a business standpoint. As I said, I do respect the decision. It's not a hobby for them but a way of life. I suggest we continue to support Walter with the RCAP unit and its development. That is what I int
  16. I have the PDC-10 manual in PDF form. If you PM me with your e-mail address I'll send it to you. Dan
  17. Hey Mike, This thread is alive and well again. We have another group posting some troubleshooting issues here. Would you be able to take a look and join us? We would sure welcome you. http://www.rcgroups.com/forums/showthread.php?t=484568 Dan
  18. Pista Good looking project Pista. I have a RCAP and am beginning testing on it now. I don't know what the erratic behavior at the last waypoint would be caused by. Depending on what it is, it might be normal. Let’s make some points for everyone working with these units here. Firstly, I have a lot of experience with the PDC-10. I am anxious to see how the RCAP functions to take over for the retired UNAV product. These devices are typically designed to manage flight with dynamically stable airframes. If your aircraft is an aerobatic one it does not likely have a lot of dynamic stability
  19. I was the one that reported they didn't work, but I was premature. What I didn't know was the code isn't looking at those pots every time around. It only checks them right after the unit has been enabled. I was trying to adjust then on the move and see the throw decrease and when it didn't work, that’s what I reported. Radiohound told me about only being read during enabling so I did that and it worked then. I have a lot of experience with the PDC-10 so am making comparisons. So far it’s a little different alright. I’m still working on it. I don’t have it dialed in yet and that’s a shame.
  20. Hi Pista, Help us understand what you have going on. Can you post a picture of your plane and the setup? I'm interested in your rudder style and size. Also what GPS you're using. We can start working it bit at a time. Can you run the system outside of the plane? Dan
  21. I apologize all. I thought I found everywhere I posted this and updated the information. I forgot this one. I wasn’t able to swing a satisfactory deal with owner of the code. But, there’s good news anyway. There is a replacement unit available. It is being sold in kit form or ready to use by radiohound. Check out the details here. http://www.rc-cam.com/forum/index.php?showtopic=666 Dan
  22. MrRCCam is right, Does the receiver drive standard servos without the co-pilot? If yes, It is possible that both pitch and roll pulses from the "459 mhz" receiver are being sent at the same time. Essentially in parallel. The co-pilot cannot process the pulses if they arrive that way. Futaba PCM radio's have the same issue. The easiest fix action is to put 1 to 2 servo buffers in line with either your elevator or aileron signal between the receiver and the co-pilot. This will delay the pulse on that line so it will lag the other one. It doesn't matter which control you do that to but
  23. kd7ost

    UAV Help

    You might want to bounce this off of Bob Young in your homeland. http://www.silvertone.com.au/ He's been in the business for a while and has a handle on the local Au laws etc. It's a large undertaking and I think you're asking for help that is a few steps down the road. It might be good to pick a platform, a guidance system and start growing the system one aspect at a time. But contact Bob at Silvertone. He's great guy and will be of help to you. Dan
  24. http://www.rcgroups.com/forums/showthread....ight=long+range Here's a thread where some of that was discussed. There are some people chiming in that work in the UAV community. "Long Range" is a pretty subjective term. Generally speaking, a low RPM big prop will be more efficient than a small prop turning fast. 4 stroke glow engines are much more efficient than 2 stroke counterparts. It comes complete with glow fuel residue though. (Think pusher) They're more expensive than the two strokes too. You can convert quite a few variations of 2 stroke glow engines to diesel using a converte
  25. Depending on altitude, you can get 2 to 3 miles out of a stock RC system. The higher the better. If you have a fairly clear area I consider it safe only as long as you use a spotter. Once you're that far out you need a Video link to see what is going on. The spotter helps by scanning for other approaching aircraft. I live in the Idaho High Desert so on a still day you can hear full scale planes when they're farther than 10 miles out. You just have to be able to respond if one starts heading your way. I use a GPS device with a co-pilot stabilizing unit as well as a BP altitude lock. If I need t
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