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HelicopterRadio - Servo - Gyro - Gov - Batt › Random tail spin with Mini-G?
03-22-2009 11:28 PM  8 years agoPost 1
Funky Trex

rrElite Veteran

Westerville, OH -​USA

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I bought a new Mini-G and installed it on my Trex 450. I flew it for the first pack today and it felt great. It was the best my 450 tail has ever been. I was really happy with the performance so I dropped in a 2nd pack and kept flying. About 3-4 minutes in, my tail began to suddenly piro out of control. The piro was extremely fast (like the original Rave videos), at least 2-3 times my piro speed during the flight. I was upside down so I just flipped hold and watched it go into the ground from about 60 feet up. Luckily it hit a big dirt pile and only broke the skids and bottom plate. Without turning anything off, I straightened the blades and hovered it. The tail was fine again I flew 3 more packs and on the last pack I was piroing one direction when suddenly it started to piro the opposite direction out of control causing me to crash breaking blades, frames and a few other bits. After the 2nd crash everything looked like it was working correctly (although it was too broken for a test flight). Any ideas what could be causing this? I have the 1.6v 6100 and it wasn't blinking. As far as I could tell, I still had control of everything except the tail on the way to the ground. Has anyone experienced anything similar? This heli has been pretty abused with over 1500 flights but I have never experienced anything like this until today. I have 3 Solid-Gs on various helis and I have been VERY happy with them which is why I wanted to try the Mini-G on the 450. When it was working, it felt AWESOME... I just need to know what is causing the random tail spins

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03-22-2009 11:32 PM  8 years agoPost 2
Wingman77

rrProfessor

Pulaski Tennessee

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I assume you are running 5.1v to the gyro? and what servo are you using?

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03-22-2009 11:34 PM  8 years agoPost 3
Funky Trex

rrElite Veteran

Westerville, OH -​USA

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I am running 6 volts to everything (Medusa BEC) and I have a JR3400 on the tail. The tail has never felt so good on this heli. I still can't believe how well it was flying before the wrecks... I really need to track down this problem!!

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03-23-2009 01:24 AM  8 years agoPost 4
Wingman77

rrProfessor

Pulaski Tennessee

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every time it failed did it spin the same direction?

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03-23-2009 02:22 AM  8 years agoPost 5
Funky Trex

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Westerville, OH -​USA

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I am not sure. The first time really caught me by surprise. During a flip, while it was inverted it just started spinning rediculously fast. I immediately hit hold and the headspeed died pretty quick and it just fell out of the sky. The second time I was doing a small rainbow with a piro in the middle. During the piro, it stopped and started to spin very quickly the opposite way. I hit hold and it came down and crashed. Both times I had control of the cyclic because I tried to correct it and I could see the heli trying to respond before the headspeed ran out.

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03-23-2009 02:59 AM  8 years agoPost 6
Wingman77

rrProfessor

Pulaski Tennessee

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are you sure it was the gyro and not anything sticking or a bad servo? are all the conections for the gyro and tail servo good? have you checked to see if the wire is rubbing on the frame anywhere?

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03-23-2009 03:20 AM  8 years agoPost 7
Funky Trex

rrElite Veteran

Westerville, OH -​USA

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I am not positive it is the gyro, but it is the only thing on the heli that changed before this problem started. This is a VERY used heli though. I checked all of the connections at the field after both wrecks and nothing was loose. I don't see anything rubbing either.

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03-23-2009 03:21 AM  8 years agoPost 8
Wingman77

rrProfessor

Pulaski Tennessee

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with your hand put a little load on the servo and run it back and forth and see how smooth it is.

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03-23-2009 04:32 PM  8 years agoPost 9
Funky Trex

rrElite Veteran

Westerville, OH -​USA

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I took apart the servo last night to see if I stripped any gears or lost any teeth and the gears all look fine.

I have the heli all rebuilt for another flight, but I am worried I might have the same result Any ideas for anything I should try before more test flights? I have other helis I can test the gyro on, but they are much more costly to crash than the 450 if something goes wrong.

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03-23-2009 07:36 PM  8 years agoPost 10
HeliVIG

rrApprentice

Hearne, TX USA

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Did you grab the tail blades and try to turn the head to make sure nothing is snapping loose in the drive system.

If the Mini G was holding better than what was in there before it might have put extra load on something causing a failure of the drive system. Either the auto unit or possibly the tail belt or pulleys. If you hit hold quickly you might not notice a drive system issue.

Also just check through all the plug connections and move them with the radio system turned on and make sure nothing strange happens when you move stuff. Possibly a bad connection somewhere.

Curtis

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03-24-2009 09:26 AM  8 years agoPost 11
Funky Trex

rrElite Veteran

Westerville, OH -​USA

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Thanks for the response Curtis. I checked again to make sure nothing was loose, but it all seems normal. I run the belt pretty tight but I can make it slip in flight if I really hammer the collective. I have done that quite a bit on this heli so I know how that feels when the belt slips and I am ready for it. This definately felt like a full speed piro, probably 2-3 times faster than the full piro speed during the flight. It spun for a few seconds and I tried giving an opposite rudder input but it didn't respond so I hit hold. I flew it right after the crash and it performed perfectly again for two 5 min flights before the 2nd incident I think it is some kind of electric glitch or something. I am going to try cleaning up my wiring to see if that helps. My ESC/BEC wires are all seperated, but the gyro wires were just bunched together with my servo wires.

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05-04-2009 01:58 AM  8 years agoPost 12
Funky Trex

rrElite Veteran

Westerville, OH -​USA

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CYE and Brian have been a great help with this problem. I didn't trust the gyro after the hard crashes so Brian replaced it for me. I pulled the Spartan off my Rave and replaced it with the new Mini-G. I have had 20+ flights so far and it is working great!! I flew a ton of fast backwards today and it was completely rock solid no matter how sloppy my flying was.

Thanks Curtis and Brian for helping resolve this issue. This is a killer gyro and the more I fly it, the more I like it

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HelicopterRadio - Servo - Gyro - Gov - Batt › Random tail spin with Mini-G?
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