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Pista

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About Pista

  • Rank
    RC-Cam Visitor
  • Birthday 07/13/1969

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  • Website URL
    http://www.leteckafotografie.com
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  • Location
    CR Prague - central Europe
  1. I made this I am getting it ready available as a kit There is a whole thread about it here: http://www.rcgroups.com/forums/showthread.php?t=1564878 That camera turret was inspired by this very expensive product (4000 USD):
  2. Pista

    RCAP

    Hi The autopilot set up is so easy. The goal is in an idea that struck me one day. Speed hold. We measure the difference between static and dynamic pressure. All of you understand how this works. On the plane we have the Pitot tube, from where the two pressures are lead to the engine servo interface (Speed Hold). It is a board where two pressure sensors are integrated along with electronic that tells the engine servo what to do. It works in this way: After take off you fly the model at a requested speed. Then activate the speed hold by a switch from the transmitter. By another proportional channel you adjust the sensitivity and time reaction for the servo. After it has been activated, the plane maintains the set speed and the engine servo operates the accelerator. When the speed hold is activated, you cannot operate the throttle from the transmitter. The FMA Copilot levels the plane. Here is the golden idea: We put the infrared sensor on a swing. The swing can turn the sensor forward or backward according to what we want from the plane to do (climb or descend). The swing is operated by a servo that takes the decision from ALT HOLD. The elevator servo is operated by the copilot elevator output. By this way we ensure nice climb or descent without any abrupt changes of attitude, even using such an unstable acrobatic plane as we used. Alt hold It is a similar thing as the speed hold. It has only one super sensitive pressure sensor and it takes the static reassure from the Pitot tube. You gain some altitude with the model plane, than you activate the Alt Hold and the Copilot. Since than the swing with the sensor on it starts rocking and the elevator does what the copilot says. The result is that the plane maintains the altitude that the plane was at when the ALT HOLD was activated. You can still operate the elevator, but cannot operate the swing servo. If you force the plane down and than loose the controls, it would climb back to the decided altitude. It is really funny. It is possible to change the gain settings of the ALT HOLD by a spare proportional channel. The plane goes on a route thanks to a GPSNI. It works on the same basis as the RCAP, but without its inefficiencies. I studied RCAP for a long time and believe me it is not a good thing to use on big fast planes. We are not happy with the GPSNI yet as it is not able to solve the crosswind error. We are working on it. At this stage it is capable of flying on a predefined route. We deal with the CTE (cross track error) by setting more waypoints along a longer route. In this way, the plain is not blown away from the wanted track. Basically it navigates very well. I like its behavior when it gets to the last waypoint. It holds there in nice circles without any hesitations. The GPSNI switches on and off by a separate channel. When it is switched on, you cannot operate the rudder control. All the autopilot channels are predefined on the fail safe. If the radio is switched off, the plane lives own life and starts the programmed route. This set up is really at the beginning. We need to do more tests before the components are ready for any sale. I expect the prices for the components would be: Speed hold - 250 Alt hold - 270 GPSNI - 300 Count up the copilot price, the Pitot tube can be made in the workshop. I am a user of the www.u-nav.com things. The Pico pilot I got from them never worked, the sped hold can not be compared with the one we made and the alt hold integrated in the Pico pilot was useless. I tested their products on an electrical sale plane. What ever I did with the surface linkages or other adjustments, it would not fly the plane at all. I finally returned it back. It cost me a lot of time and money for nothing. I believe them their stuff flies autonomous planes, but it did not fly mine. I need a set up that would fly any plane. The incorporation of the autopilot must be fast.
  3. Pista

    RCAP

    Hi everyone. We have rebuilt the RCAP as I promised. It is now working much better then the original RCAP. The main fault with the old one was that the servo kept the rudder position for only 1/10 of a second. Then the servomotor stayed without power. If the plane was fast, the wind would blow down the rudder in to the center position. That was the trouble. Such a fast plane would not be able to turn. Our GPSNI (GPS Navigation Unit) keeps the rudder under power all the time. There is another success. We built the speed hold and ALT hold as wel. Our acrobatic plane is able to travel on a predefined route in set altitude. It keeps the alt within +- 10 meters, but we will improve this. Copilot levels the wings. If there is an interest, we would be able to sell these things. Guys it is such fun. Imagine. You take off the plane, and switch off the transmitter at a constant speed and a determined ALT. then the GPSNI navigates the model to a waypoint lets say 10 miles away. When it gets there, it starts holding over it. Meantime, you drive a car to the place. When you get there, you have a look above and it is there, circling. Just make sure there is enough fuel for it.
  4. Hi Terry I have made power point presentation regarding the arrow pointer. Where do you want me to post it
  5. Pista

    RCAP

    Hi Thanks a lot for the replies. The reason why I chose this plane is as it is fast, big, can carry some payload and a lot of fuel. Copilot handles it very well, even the rudder driven by RCAP is fine. I shortened the linkages and it is fine now. It flies 50 - 70 Mph. I am a licensed pilot. I fly ultra light planes. When all is ready I will follow the model plane on a route by a real plane. The model must be fast, otherwise I could not do it. It might happen, that when it arrives at the final point, it is so fast, that the reaction to the rudder takes some time, and before it actually starts turning, the GPS decides the opposite direction of the turn. Well I have to admit this doesn’t happen always, but often. If you leave the plane holding at the final point for some time – let’s say 10 minutes, the event will come and the plane disappears in left and right half turns. I do not know what would happen if I let it go. Maybe it would return back after having flown some distance. I didn’t have the nerves to allow the plane get away. I had the nerves to let it go pretty far from the waypoint (in the half turns) It might have been 0.5 mile distance. It didn’t appear that it would come back. It would be good to add some software specifying the holding patterns. Do I understand that the pots are supposed to work only when the Rcap is being enabled? And then it is not possible to affect the rudder servo movement by them? I must try this. Dan, the GPS sends data to RCAP once per 2 seconds I have flown 5 waypoints beyond the visual range of a pilot. Not much, but enough to see it works. I am not sure about the led, but I have interesting story when due to vibrations the GPS batteries lost contact in the GPS case. Very dangerous, once the plane is on its way. Everyone prevent this to happen. Walter, give me some time to have a look at your technical questions. That is my friend’s part.
  6. Pista

    RCAP

    Hi Rcap has its imperfections. Have you read my report about RCAP testing? There would be the answer to most of your questions. I am using Garmin E-Trex, Acrobatic plane with a 2 meters wingspan, The trouble is not the pots. The trouble is the behavior at the final waypoint, and the servo handling when RCAP is on board. The servo works in jerky movements. Have you noticed? So far guys, it looks like no one here has actually flown the device on a route that ends with a destination waypoint. I am going to solve my problems in this order: 1 I will reprogram the chip with a file that radiohound is using (I hope he will send it to me) 2 If this doesn’t help, I will have Radiohound sending me his peace to find out if it works better. It might be possible that the problems are caused by using a bad file, or wrong components. The question of the day is: Can RCAP guide a plane without a cross track error? We know it can go from a waypoint to a waypoint. If the plane receives strong wind from a side, the flown track would look like a bow. But if RCAP can eliminate the cross track error, it would be a straight line. Can someone answer this? We need to know from some other person how RCAP did on the route. Built it and fly it and send the report here people. I am sending a picture of my RCAP Other pictures regarding the RCAP and SPEED HOLD could be found here: http://album.volny.cz/leteckafotografie/br...0&browse_page=0
  7. Nice you found domething. We are interested what it is
  8. Pista

    RCAP

    Well as soon as it gets to technical language. English is not my mother tongue. Can you give me more detailed explanation of what you mean. Please do not use abbreviations, as they are difficult to find in a dictionary if they are listed at all. Why would Mike (creator of RCAP) put the C9 and C10 of the published value there, if they were not supposed to work? I suppose he must have had them checked working. Would you have any different suggestion? We are nearly through the Alt hold and Speed hold, working on RCAP to guide a model properly.
  9. Pista

    RCAP

    Hi everyone. Has any of you flying experience with the RCAP as me? Do you have the Gain or Travel limit trims working? They are not working on my piece. I have tried Alt Hold of my construction. There are some problems but it looks it will work fine. I have bought and tested PicoPilot and returned it to the producer. I was not able to set it working. The support I got from the producer was nearly nothing. I would have to spend a lot of hours adjusting my plane and the control surfaces to start with it. Besides the software that enables the route planning was clumsy and not precise. RCAM, FMA Copilot, Alt Hold, Speed hold will do much better (with their limitations) and will fly any plane. I would need to talk to radiohound about his trims.
  10. Pista

    RCAP

    Hi I have sorely tested the RCAP in flight. These are the results. 1 The trims do not affect ether of the functions Gain or Travel limit. Solution to this is to reduce the rudder movement via the linkages. 2 Once it gets to the last waypoint, it starts holding there. As the intelligence of the RCAP relies on the GPS receiver, it would not hold in right or left patterns, but it would hold in random patterns. Typical example is: 3 right patterns, then two left ones then 1 right and so on. 3 The situation in number two can result in this: When the RCAP brings the model exactly above the final waypoint, it firs passes the waypoint and than the GPS decides which way to go back to it. The gps pointer suggests a right or left turn, then the rudder goes to a position according to it. The model starts turning, but before the turn is finished, GPS changes its mind and sets and opposite turn to the final waypoint. The model starts turning the other way round. This repeats until the model disappears in left and right turns. These tests were done on a 35 ccm acrobatic model plane. On board- FMA Copilot, RCAP, GPS Etrex, SPCM20 JR receiver. I expect that if I had a GPS receiver that would send data to the RCAP more frequently- mine is sending data once in two sec., this wouldn’t happen. The RCAP behaves OK during navigating on a route. It has only the mentioned problem when it overlies home waypoint and the waypoint stays exactly180 degrees behind it. Do you have the same experience? If not what GPS are you using and how often does the position data refreshes?
  11. Pista

    RCAP

    Thanks to all joining This is my experience with it. First I have to say I work on it with a friend of mine who does the programming of the processor. I am the test pilot. He had to correct the program a little as there was no oscillation on the processor. It was an easy correction. We used the available files to program it from the net. It started to work afterwards. There is just a problem with the servo movement when it is not engaged. If the rudder stick on the transmitter is moved quickly, the servo gets confused. Example: I move the stick quickly to the right the servo would go there, and as soon it is there, it would go fast left and than back to right where it should be. Has anyone such experience? I am using 35 MHz Hitec Rx, JR Tx, GPS E-track. Setting of the GPS is as it was already said. More questions following: 1 What file did you guys use to program the chip? 2 Has anyone actually flown it? –Experience? 3 Does it exclude crosswind from the flown track? 4 Is there a link to a person who did the program? 5 Can someone compare it to PDC 10? 6 Has any of you another source of information on the topic than the one mentioned? Is there an E-mail to inform someone about the mistake in the program? How about the seller of the already programmed chips?
  12. Pista

    RCAP

    We programmed it here using the published files on the nett JP
  13. http://www.rconline.ca/products/mi-soft/rcap/ Has anyone any experience with this? I am just about to try it.
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