FMA FS-8 malfunction
ok i just about had a fly off yesterday , was finishing 45 min duration test , flipped switch to manual mode and added throttle and banked to turn towards myself , i soon lost all control of all surfaces and throttle. i only have rudder going through the controller for nav and channel 5 for mode switch , so whatever happened effected the receiver . it flew off to the east straight and level . panicking i flipped the mode switch back and forth . after about 30 seconds witch seemed like forever , it started working again and i was able to bring it back and land quickly . after going aver everything and considering how the airplane behaved the only conclusion i can come to is the fs8 geeked out and didn't even go into fail safe mode. here is what makes me think that.
#1 "receiver only" controls went out of control
#2 it wasn't a power loss to the receiver because the signal was still getting to the speed controller (it cuts out after 2sec if it losses signal)
#3 it didn't go into fail safe because it didn't do what i programmed it to
#4 after getting it home i found a Strong glitch in channel 4 with motor at full rpm even with AP stuff removed and different servo
#5 ch4 glitch goes away when receiver is replaced with a trusty hitech rx
and finally
#6 i went to the fma website and they no longer make them !!!!!!! cant find them any ware!!!!
#1 "receiver only" controls went out of control
#2 it wasn't a power loss to the receiver because the signal was still getting to the speed controller (it cuts out after 2sec if it losses signal)
#3 it didn't go into fail safe because it didn't do what i programmed it to
#4 after getting it home i found a Strong glitch in channel 4 with motor at full rpm even with AP stuff removed and different servo
#5 ch4 glitch goes away when receiver is replaced with a trusty hitech rx
and finally
#6 i went to the fma website and they no longer make them !!!!!!! cant find them any ware!!!!
Replies to This Discussion
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3D RoboticsPermalink Reply by Chris Anderson on -
RE: #1. Er? Could you rephrase?
As for the big question, do you think it might have something to do with battery voltage? Or just a coincidence that it happened at the end of a long flight?
Interesting that FMA isn't listing the FS-8 anymore. (it's still selling the stand-alone Co-Pilot units, without the receiver, which is what we use now). I think that's no big loss, as the receivers were increasingly outmoded since they don't work with PCM transmitters, to say nothing of 2.4 Ghz digital. We'll probably take a page out of the Paparazzi book and integrate all the functionality of the Co Pilot into our autopilots, which means you'd eventually only need their sensors. And if they stop making those, we'll make our own, too.
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Permalink Reply by wayne garris on -
had 1200 ma left to burn . load test looked good before charge. checked all voltages and checked signals on scope everything checked out good until i hit the throttle and i get a heavy glitch on ch4 . i replaced the receiver and glitch is no more . other then that the flight went well it even thermaled for 15 min w/o throttle . think an imu would be much better. im playing with the 5dof ,the copilot was mostly to see if the nav works and so far im happy with it .ive looked a the paparazzi sensor but if im going to make something its going to be an imu. how is the Lego imu working out ? are the gyros commercially available yet?
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Permalink Reply by wayne garris on
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ok changed #1 sorry about the typo
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3D RoboticsPermalink Reply by Chris Anderson on -
iGyros not out yet, I'm afraid. (nor is the RC/Servo MUX). HiTechnic has a lot on their plate right now, so they may not be out until Fall.
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Permalink Reply by wayne garris on
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but acroname offers a rcmux here http://www.acroname.com/robotics/parts/R306-RXMUX.html
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3D RoboticsPermalink Reply by Chris Anderson on -
No, I mean a Mindstorms compatible RC Mux. That requires both:
1) An I2C interface to Mindstorms NXT, along with NXT-compatible drivers
2) An RC MUX
The only commerically available one right now is made by Lattebox and can be found here. But it doesn't have RobotC drivers yet, and I can't be bothered to switch to yet another language.
BTW, the simpler RC MUXs, like the Acroname, are pretty easy to make, too. Here's Jordi's, with a built-in hardware failsafe.
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Permalink Reply by wayne garris on
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ok i got you . think ill pick up a mind storm soon they look llike fun .
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Permalink Reply by wayne garris on
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update :
replaced reciever and test flew last weekend , no glitching no problems
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