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07-21-2002 06:54 AM  16 years agoPost 1
shan

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Georgia

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When I hover my raptor 30 for more than 2 or 3 minutes it starts glitching like crazy. It pitches up and down and rolls left and right and the rudder jerks all over the place. Funny thing is it dont start doing it until it has been hovering for a while. After trying several diferent things I decieded to unplug the gyro. The glitches were gone but what a hand full. Has anyone heard of a gyro causing all the servos to glitch only after hovering? When I land and let the blades stop the glitches stop. If I land and let the blades spin a couple hundred rpm's less than hover speed it will continue to glitch untill it runs out of gas. I have a csm400 gyro in it. I set the gyro up acording to the directions. Could a improperly set up gyro cause glitches?

Thanks
shan
:

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07-21-2002 11:26 AM  16 years agoPost 2
helicrasher

rrApprentice

Belgium

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Maybe you need to check your main bearings.
Try cleaning and then lubricating them.

Mario

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07-21-2002 12:41 PM  16 years agoPost 3
Dirt Dummy

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Nottingham NH

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Check the screws that hold the braces to the tail. Mine where to long, and they made contact withe the boom causing a glitch like yours. If there to long you will see where they scratch the boom. Cut them back or use washers to shim them out.

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07-21-2002 01:15 PM  16 years agoPost 4
Flighttime

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Cincinnati, Ohio

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Mine turned out to be the switch harness. My rx battery packs would not hold a load. The short of it was the problem was corrected in addition minor twiching I was having went away.
Hope this helps.

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07-21-2002 04:22 PM  16 years agoPost 5
shan

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Georgia

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raptor
But would these things explain why the glitches went away when I unhooked the gyro? If it was a short in the switch the heli would behave the same with or without the gyro. I did greese the main shaft and starter shaft bearings. What does the bearing interference do? Does it mess with the reciever signal or does it directly hit the gyro?

Thanks for any ideas
shan

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07-21-2002 04:35 PM  16 years agoPost 6
steve9534

rrKey Veteran

yakima, wa.

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Glitches
Shan;
You've isolated the glitches to the gyro. Try moving the gyro further away from the receiver and make sure the antenna is as far away as possible from the gyro, if it still glitches, you may have to get a new gyro. The Futaba GY240 or 401 are better gyros anyway, and aren't too expensive. Hope this helps. Steve.

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07-21-2002 05:04 PM  16 years agoPost 7
Avropilot

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Murfreesboro, Tennessee

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I had the same thing in an Ergo.I moved the antenna and it fixed the problem.

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07-21-2002 06:58 PM  16 years agoPost 8
crashkit

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Ohio

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i had some funky things going on with a venture 30. Turns out the antenna wire end would occasionally touch the metal tail boom. The hole heli would twitch like a nervous caffiene addict. Moved the wire whoola no twitch................

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07-22-2002 02:29 AM  16 years agoPost 9
Flighttime

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Cincinnati, Ohio

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Switch Harness
In my case, I did the same thing. Hooked, unhooked servos etc. At one point I thought I isolated it to the gyro. I was just reducing the draw on the pack. Yet when I swaped the gyro with another the problem came back.
Understand, this may not be your case. Just my experience. Hope this helps !!

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07-22-2002 04:12 AM  16 years agoPost 10
shan

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Georgia

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I found it!
I went to the feild today with a buddy's gyro. I fired it up and whala, the funkychicken. So I go back to the drawing board. The last thing I do is check to see if the boom suport screws are touching the boom. Sure enough, the screws are shiney and the boom is scratched. I put a washer on each screw to hold it away from the boom and flew a tank out with no glitches. Who ever sugested this in the first place was right on the money. Thanks, and thanks to all for the help.

shan

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07-22-2002 06:22 AM  16 years agoPost 11
Stet

rrElite Veteran

Key Largo FL

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are you running a FM receiver? The gyro factor could be because the longer wires are picking up RF and sending it into the receiver. I recommend going to PCM and I bet the problems end. But there is something causing the glitching which should be found, the fin mount screws are one issue, also is your antenna routed near metal, such as the boom struts? I've seen a lot of guys strap the antenna directly to the boom struts, very bad idea. Also look for cracks in the boom struts. Anything that can cause an intermittent "loop" of metal will cause the problem. Given that the Raptor frame is plastic, instead of metal or carbon, it is much less succeptible to RF problems due to bearings, but that is not to say it could not be the problem either.

Also check:

No oil in the connectors

No nicks in the servo wires or antenna wire (watch going around sharp corners)

Extention connectors taped together

Bad switch as stated above

Poorly vib-isolated, or previously crashed receiver resulting in cracked ceramic filter

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07-22-2002 07:28 AM  16 years agoPost 12
blazen

rrApprentice

California

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Stet said

are you running a FM receiver?
>clip<
I recommend going to PCM and I bet the problems end


Unfortunately it is a common belief that the magical PCM receiver will eliminate RF interference. This is simply not TRUE, any signal strong enough to cause visible interference to an FM receiver will cause interference to a PCM receiver.

PCM is not a transmission mode like AM and FM. It is nothing more then a digitally encoded FM signal. Since its still an FM mode signal the interference is still received by the PCM receiver it is just hidden from You.

When a PCM receiver receives a signal that it does not understand it just keeps the servos at there last position. When it finally receives a signal it can decode it will resume normal operations. If after a predetermined time it does not receive a signal it can decode the receiver will go into fail safe mode.

The fact is that PCM receivers can be dangerous. PCM receivers can hide potently serious interference problems from the pilot until its to late. At that point the interference escalates to the point that the receiver goes into fail safe mode with possible drastic results.

As an Extra class Amateur radio operator. I am lucky enough to have had access to valuable resources. A while back I built a little device to count how many times my PCM receiver went into hold.
I was amazed to find out that in a 10 min flight I would average between 5 to 20 hits. of course most of those hits where very short so I never felt them.

I would faithfully check my little counter every flight. Well the day finally came. I checked my counter holy cow there was over 300 hits. Wow I could not tell by flying her, I decided to investigate. Sure enough my muffler bracket had become loose and was rubbing metal to metal. If I had not had my counter I probably would not have known until the radio went into failsafe with a crash being a good possibility.

73’s
Blazen

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07-22-2002 10:24 AM  16 years agoPost 13
Stet

rrElite Veteran

Key Largo FL

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PCM does not eliminate RF, rather it is less suceptible to low levels of it. Plenty of things cause servo jitter on FM that won't show up as a lockout (hold mode) on PCM like: jittering when the heli is touched with the starter, glow ignitor, idle mix screwdriver, or the TX antenna is to close.

When going over other's helis, I've seen a lot of screws touching the boom on Raptor 30's, as it is a standard build precaution not stated in the instructions. Those never went into hold mode, but I suggested fixing it just the same.

Helis are noisy, that's why I recommend PCM. Noise and going into hold are two different issues. For me, A lockout is when the heli goes into hold, and stays there, not when the receiver rejects a tiny amount of data. That's why PCM is used in the first place, to reject the expected amount of bad data.

But to the original writer: check out http://www.raptortechnique.com for every issue and detail ever known about your heli. He covers the boom screw issue as well as a myriad of others.

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