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Brian: yea I have the GPS shield on both MK machines. It works on both but on the rusty qaud is is just not nearly as good as on the CS6 where I mounted the navi and GPS on the arm.
And yep I got the GPS with the Naza, but too busy to put everything together. I did notice that the Naza has a feature where you can tell it where the GPS is from the center of gravity. Would be nice if the MK had that. When I do a spin place with the CS6, with AH and PH on, ( with the GPS on the arm) it spins around the GPS and not the center of the copter. |
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Best regards, Andrei |
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Throttle
Hey guys,
Do you ever use throttle curves? I have noticed when landing our octaXL with a SLR camera one click on throttle has a large effect on altitude. This makes for some tense moments on landing!!! Just wondering how you guys handle landing loaded copters. Marcus |
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Wright: I use throttle curve since my birds (quad and CS6) don't really take off till about 40-45% throttle. I adjusted it so I could have smoother landings and better hover control. But I have DX8 and the throttle is smooth, no clicks.
BTW: I'm heading to Winston-Salem tomorrow to tour some vineyards with "she who must be obeyed" for 4 days. Can you pvt message me with some recommendations re. vineyards and restaurants? Thanks, Gary |
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First, make your MK hover at ~127 (midstick) using the BL option PWM scaling (http://mikrokopter.de/ucwiki/en/BL-C...he_parameters:) After that, just do a slight s-curve around the center in your tx. Works really well for me. To make it makes sense to make the area around center stick less sensitive (thus, more precise input is easier). I'm not really using the otherwise large motion-range of the stick. It is a bit scary when throttling up from min-gas, as the it will go through the buttom throttle range very quickly, but once it's up, it's very smooth around hover. Also remember to do some expo on your ail and ele channels. Oh, and if your payload changes, you only need to change the PWM scaling, nothing else. |
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Were you having trouble getting smooth controls from the MK servo outputs? A friend has the same mount I have basically and his video is smooth. The difference is he is running the Wookong flight controller. Not sure if I would be better off getting the Hoverfly and bypassing the MK. Brent |
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Our video with original music on Vimeo:
Best regards, Andrei |
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Octo twitch
My octo twitches when in fast forward flight and/or high winds.
You can hear the motors make sort of a chirping noise when it twitches. It flies perfectly fine in calmer weather and slower forward flight. My thoughts are that it could possibly be some vibrations getting to the FC that are causing the accelerometers and/or gyros to freak out and send this twitching to the motors. Maybe the vibration only presents itself when in higher winds? Other than that...I'm at a loss. My PIDS are: P=85 I=126 D=15 Handles great with these settings except for the twitching. Tried the following to see if it still twitched and it does. P=100 I=75 D=10 Since it still twitches in fast forward flight with these drastically different PIDS...it makes me think it's not PIDS causing this. maybe some other setting? I really don't know. Looking for suggestions. Edit: I changed gyro comp to 32 to reduce the acc vibration effect and I double checked all props for vibration. No change. No matter what settings I try...it still makes the chirping noise (not from the buzzer, but from the motors) and twitches during fast forward flight. Thanks. Brent |
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Last edited by dmsgodeep; Jul 29, 2012 at 06:10 PM.
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Best regards, Andrei |
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What motors are you running? Yes...with Navi. Anyone have a good suggestion on motors? I've been running the Turnigy 2217/20 for 3 years and they have served me well. But now I want to run 12" props and they won't handle it. I thought about the Avrotos but would rather not spend $60/motor. Also...the last batch I bought, 4 out of 6 had bad bearings. Absolutely unacceptable when spending that much per motor. Someone mentioned Sunnysky motors, but I can't find them in stock. I'm thinking about a 700 - 900 kv rating for this sized prop. Is that about right? Any suggestions on motors would be appreciated. Anyone have experience with this motor? Thanks. Brent |
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For you guys with stability problems, have you taken the time to actually tune your PIDs rather than guessing at them?
No 2 MKs at the same for the most part. Different weights, radius, props, etc. will always provide different results. I changed from my APC 11x4.7s to Graupner 11x5's (the Graupners are heavier much to my surprise). I had to retune my Y6 to the new props. Tuning your PIDs is well described in the Wiki. You then need to adjust the PIDs for the GPS. If you don't, you will have the toilet bowel affect. I suspect that every other vendor has the same problem, it is that they are selling a complete solution that is pre-tuned for what they are selling. Take the time to Tune your PIDs. The difference is amazing. If you have tuned your PIDs and then still have a problem, then lets work through it. http://www.mikrokopter.de/ucwiki/en/MKTools-Setup BTW, a few weeks back, the person that crashed with GPS hold on and not manual, that might have been related to being between 2 buildings with the MK. GPS signals to reflecting off the buildings causing your location to jump around. To see what I mean, drive through any city with tall buildings and watch your car GPS move you from 1 block to the next. Mike |
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