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HelicopterMiniature Aircraft Whiplash & Fury 55 › Glitching.......Maybe?
12-04-2005 04:22 PM  12 years agoPost 1
Camel Jokey

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Dubai, United Arab Emirates.

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Hello Guys.

I have a Fury Tempest, closed tail box version, been flown for around 8 months, orignally it had an OS-91 C spec installed but it used to stop after around 8-10 minutes of flying, I changed it for a YS-91ST & that did the same thing only the once though, then flew for another three months, no problems.

I then installed a duralite 4000mah pack & a 5.3v regulator, no problems there, I had a CSM 560 gyro & a JR 8700G servo, they never would work so well, so I swapped them out for a GY611 & everything seemed fine for the next few flights.

OK now the machine flies for around 6-8 mins and then the three servos (JR DS8511) controlling the swashplate "jump". From what I have seen the helicopter do in the four times it has happened is that the three servos & only these (throttle OK, steady rpm & tail OK, constant heading), was to cause the heli to decend as if I had lowered the collective rapidly then after a slit second just before impact they spring back to life, I land & then collapse, from too much adrenalin, it hasn't crashed yet, also notewothry is this heli has never been crashed.

Last time it happened was when the heli was hovering at about 10ft less than 8 meters away from me, I got a good close look at what happened, It just dropped so fast like I lowered the collective & then recovered at about 1ft, back into a stable hover, OH MY GOD, I landed & wondered what the hell.

I have tested the voltages for the duralites, the wire harnesses for the servos have also all been checked, It could I suppose be the RX (35mhz JR 649 PCM, set to FS), it could be a bearing, or well I don't know..........?

One interesting thing though, I have a throttle jokey pro installed & it was set to normal servo mode now after the last episode it is in super servo mode, could this be my problem?

That is where you guys come it, suggestions please, I will post the results, so thanks in advance.

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12-04-2005 08:36 PM  12 years agoPost 2
Thomas L Erb

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Alliance ohio

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I am assuming that you are flying PCM where are your failsafe settings ? are they in hold or are they preset? what radio? Tx-rx? sounds like a radio problem just a thought Tom

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12-06-2005 03:59 PM  12 years agoPost 3
Camel Jokey

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Dubai, United Arab Emirates.

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Well I think we have a result.........Fantastic.

I would first of all congratulate David (Helifreak)as he was correct in saying the rx was going in to failsafe, Thank you David & many many thanks to everybody else who contributed.

It was Davids point & a note raised by none other than Ron Lund of ricks helis, that helped me track it down, well I think so 3 good fiights & no lockouts or sudden uncommanded movements.

It goes like this..........The GY611 gyro uses a very fast servo that subsequenly uses alot of power during flight, it was this large power consumption that was causing the problem & had routed the antenna wire a bit too close to the servo harness & I think this was causing a problem.

I will be flying some more on Saturday & I will let you know what happens.

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03-06-2006 09:20 AM  11 years agoPost 4
Camel Jokey

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Dubai, United Arab Emirates.

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Well three months of trouble free flying without any problems and then..............Saturday started flight in normal mode & switched to idle up 1800RPM, did some flips a few tic-tocs then just 6 inches from the deck rightside up in the hover & the glitch returned...........the heli went into the ground skids first, bang..! then recovered back to the hover, then bang again into the ground & recovered then again hard into the ground bang this time the blades failed severing the boom the tail gearbox departed with the horizontal fin, the drive shaft shot out like an arrow & I ficked it into throttle hold, the engine went to idle, this whole incident was over in about .3 of a second, such a large amount of energy was being released the debris covered several meters of the flying feild.
Nobody was injured & now the investigation begins..I will post the photo, If anybody is interested.

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03-06-2006 05:58 PM  11 years agoPost 5
I3DM

rrProfessor

Israel

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WHat are the Rx fail safe settings set to ?

www.liorzahavi.com

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03-07-2006 06:52 PM  11 years agoPost 6
Camel Jokey

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Dubai, United Arab Emirates.

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Throttle to cut-off.
Gyro to HH.
Pitch to -6 (unable to seperate it from the throttle with the JR3810 programming).
Cyclic & elevator to neutral.
Governor to off.

Thanks for asking.

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03-08-2006 02:45 AM  11 years agoPost 7
rada70

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Westchester, NY

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Glitch

I would say it's the receiver. If it was a lockout then the failsafe would kick in. I read your thread on Heli-freak. I had the same exact problem with one of my stratuses. It drove me crazy. I then sent the G3 receiver to futaba. It turned out the receiver was defective. On my other Heli i had something simillar, but this time, it was the revmax. when I changed it to gv1, the problem went away. From my own experience I think that the revmax connectors are not compatable with the futaba receivers.

Just do it.

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03-08-2006 01:57 PM  11 years agoPost 8
bkervaski

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Birmingham, AL, USA

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There are two things that need to be done to the G3 RX (5014).

1) If you're using a long tail servo wire, use the Futaba filter.
2) Trim the antenna wire to 550mm (per Futaba tech support).

These mods make all the difference. The new G3's are coming with even shorter antenna wires. I have one where the antenna wire doesn't even make it out of the back of my antenna tube/shealth/whatever on my Evo 90 and still range checks better than expected.

For a first generation device, it's bound to have some issues. I'm a sucker for new tech and I've grown to love my G3's. With good digital servos, you can feel the difference that 2048 brings and being able to quickly swap channels at the field without disassembling anything is great. You can find them for < $300 if you shop around.

Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels

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03-10-2006 11:54 AM  11 years agoPost 9
Thomas L Erb

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Alliance ohio

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just for claraty what radio are you using? and is what you posted above what you have your failsafe settings set to? i havnt seen a radio with FS that you couldnt seperate the pitch and throttle settings. if this is the case you should have your FS setting to the hold position so at least it doesnt go nuts on you. Let me know Tom

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03-10-2006 12:00 PM  11 years agoPost 10
nivlek

rrProfessor

Norfolk England

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Pitch to -6 (unable to seperate it from the throttle with the JR3810 programming).
I'm sure that with the 3810 you can set each channels hold position independantly , but even if you couldn't you could set the positions while in throttle hold , so that the engine is at idle and the pitch is where ever you like .

At the end of the day , it gets dark .

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03-10-2006 06:21 PM  11 years agoPost 11
Camel Jokey

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Dubai, United Arab Emirates.

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The transmitter I am using is the JR3810 ADT, The RX I have is a JR PCMs ABC & W system NER-649s on 35.240mhz. I originally thought that each channel could be set to it's own specific position in failsafe, but this particular radio only allows each channel to be set INDIVIDUALLY to either HOLD or F/S.

The 3810 when set to F/S.
A predetermined value stored by putting the switches/sticks into the desired positions & pressing the CLR key thus storing the stick/switch positions in the memory of the unit, so when it loses its signal it will go to the values you programmed into it.

This system is flawed because you cannot seperate the throttle & pitch curves from each other, therefore when you want throttle @ idle in F/S you will also get the corresponding blade angle @ idle.

The reason I set the failsafe up in the way I did was, that IF the helicopter lost its signal I wanted it to stop flying & crash that is purely down to safety the consequenses of a heli being, say in a hover & going in to hold right in front of me could have been fatal, I will swop a smashed heli for an injury anyday.

UPDATE......During the post crash investigation I appear to have found a problem with the battrey regulator system, I won't give you the results or the manufacturer until I know for sure though.

The RX has been dispatched to JR for a full test & accesssment. (Thanks to rada70 for the tip) again I will keep you all informed when I receive the results.

Many many thanks to all who have read & continue to contribute, hopefully it will make our sport safer & more fulfilling for us all.

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03-10-2006 06:23 PM  11 years agoPost 12
Camel Jokey

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Dubai, United Arab Emirates.

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NIVLEK, thanks you are smarter than me, good idea.

Use the throttle hold & press the CLR button.

Great.

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03-11-2006 12:25 AM  11 years agoPost 13
Thomas L Erb

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Alliance ohio

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Hi camel nivlec's idea is great the only thing i have to add is that you should set your pitch to around 0 to +1 so it may come down a little softer to minimise the damage. Personaly i only use The hold on all of my settings . most of the time you will fly out of the interference. except for battery failure which in that case it wont matter what you have set it will not move anything where you want it. I cant say about your radio but no matter what i set my throttle at after about 2 seconds of lost signal my throttle will go to idle anyway. If you get a chance test this when you get it fixed. Tom

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03-11-2006 06:09 AM  11 years agoPost 14
Camel Jokey

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Dubai, United Arab Emirates.

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Thanks Tom, will do.

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HelicopterMiniature Aircraft Whiplash & Fury 55 › Glitching.......Maybe?
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