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HelicopterMain Discussion › Is it possible? FBL settings change...
02-19-2017 03:46 PM  8 months agoPost 1
RM3

rrElite Veteran

Killeen, Texas - USA

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After finally getting my heli back together after a big crash months ago (had to wait on machining parts and free time) I wired everything back together with all the original electronics...

when I turned everything on again for the first time since the crash I noticed something pecular.... my swash was not responding correctly, almost as if the swash combo selection (CGY750) had been changed...

studying carefully how it responded (collective and elevator where wrong) I recalled when I crashed the helis response just before it ate dirt matched what I was now seeing on the bench...

Is it possible that the FBL unit, a CGY750 some how glitched mid flight and changed this one setting causing me to crash?

I put it back on the bench and changed the servo combo in the swash setup to #3.... it was in #2. just weird. this morning, turned back on the electronics to see if it was still good (it was) and wondering if this has happened to anybody else.

CGY750, 8FGsuper

showing a preference will only get you into trouble, 90% of everything is crap...

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02-19-2017 04:26 PM  8 months agoPost 2
Solmanbandit

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Tucson , AZ

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It can happen. I have seen it before. Electronics just like anything else can get damaged in a crash.

Trex 700E / Trex 500 ESP - Ikon/ HD 500 - Ikon 2/ Goblin 500 Ikon 2

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02-19-2017 05:56 PM  8 months agoPost 3
RM3

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Killeen, Texas - USA

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it didnt happen after the crash... it happened while in flight. Heli was on its third flight of the day, then coming out of a stall turn, heli was not responding the same, as if the swash was locked, inputs were weired... then it crashed. fixed everything mechanically broken, put it all back together, and FBL unit is not programmed as it was originally, had to change that one setting.

the unit had never been in a crash before this incident.

showing a preference will only get you into trouble, 90% of everything is crap...

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02-19-2017 06:12 PM  8 months agoPost 4
Solmanbandit

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Tucson , AZ

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It happens, working on full scale aircraft, electronics break all the time. Not so much on our RC stuff, but is possible to go bad. I just got an ikon 2 and now the tail slot is bad.

Trex 700E / Trex 500 ESP - Ikon/ HD 500 - Ikon 2/ Goblin 500 Ikon 2

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02-19-2017 06:24 PM  8 months agoPost 5
RM3

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Killeen, Texas - USA

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my concern is thats its working now while on the bench.... Im worried that it may happen again while in flight.

Ive had FBL units fail in the past, but its always been something with the Gyros.... not a single setting.

showing a preference will only get you into trouble, 90% of everything is crap...

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02-19-2017 06:49 PM  8 months agoPost 6
allns47

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Richmond IN.

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Send it in to be looked at...if you think the settings changed in flight I wouldn't use it

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02-19-2017 07:35 PM  8 months agoPost 7
Flyin for Jesus

rrVeteran

Dana Point, Ca. 92629

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my concern is thats its working now while on the bench.... Im worried that it may happen again while in flight.
Ive had FBL units fail in the past, but its always been something with the Gyros.... not a single setting.
I had a GT-5 ( Thunder Tiger ) do something weird once during spoolup and tip my heli over ( blades into dirt ) but my HS was slow enough that nothing was hurt.

I just never trusted that FBL again and put it on a 450 size that didn't really matter if it crashed. ( it was cheap )

I would retire that FBL and if used again, would be on something I wouldn't care too much that it crashed by FBL malfunction.

I wouldn't send it in... since it works fine now, Futaba likely will not be able to recreate the problem.

Just my opinion here.

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02-19-2017 07:53 PM  8 months agoPost 8
don s

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Chesapeake, VA

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I have seen that before on a CGY. I sent it in for a check-up (had been in a crash). Check up was good but return packaging left the unit free to rattle in the box. I mounted/programmed it anyway and it seemed fine. Later on I was prepping for a re-maiden, and the unit programming was fubar on start-up. Was it my crash? Was it sh#$%y packaging? I threw it in the trash and picked up another from my favorite Japanese supplier.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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02-20-2017 12:10 AM  8 months agoPost 9
wc_wickedclown (RIP)

rrProfessor

long beach calif

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which bec are you running ?

and what size heli ?

Insha Allah made in america

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02-20-2017 12:21 AM  8 months agoPost 10
JuanRodriguez

rrProfessor

The Villages, Florida

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@WC,

Just curious as to why you think it would make any difference???

Been there, done that and old enough to know better.....

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02-20-2017 05:43 AM  8 months agoPost 11
MMarozas

rrNovice

chicago

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By chance when rebuilding your model did you happen to unplug servos from 750? If you were to have switched your AIL and PIT servo, that may cause you to have to change from servo combo 2 to 3. I would be curios to see if your switch AIL and PIT and go back to combo 2 if it would be correct.

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02-20-2017 08:15 AM  8 months agoPost 12
allns47

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Richmond IN.

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Have you found out anything

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02-20-2017 03:19 PM  8 months agoPost 13
Solmanbandit

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Tucson , AZ

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By chance when rebuilding your model did you happen to unplug servos from 750? If you were to have switched your AIL and PIT servo, that may cause you to have to change from servo combo 2 to 3. I would be curios to see if your switch AIL and PIT and go back to combo 2 if it would be correct.
He said it happened mid flight. If that was the case, he would've have known from the beginning.

Trex 700E / Trex 500 ESP - Ikon/ HD 500 - Ikon 2/ Goblin 500 Ikon 2

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02-20-2017 03:25 PM  8 months agoPost 14
Heli_Splatter

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USA

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I would fly that controller on your cheap birds to gain confidence before putting it back on an expensive bird. Seems kind of wierd what you report, but anything is possible. I would have though more likely as a result of a crash, but an electrical spike could has done something mid flight.

Are you using BEC or direct battery power? Possible brown-out during flight? Instant of high current draw could have sent battery below threshold.

I would be careful until you trust it. No trust? throw it away or put it on ebay like everyone else does.

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02-20-2017 03:26 PM  8 months agoPost 15
JuanRodriguez

rrProfessor

The Villages, Florida

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He is "speculating" it may have "glitched" during a flight causing the heli to crash....

But he didn't see this anomaly until after the rebuild and while setting up the heli once again after the rebuild....

The heli was apparently flying OK up to that point and then something happened so if that issue was there from the start of the flight he would have crashed when lifting it into a hover to take off.....

Anyhow, that's my interpretation and I'm sure RM3 can elaborate on it a little more.....

And if a brownout were the case, it would cause a reboot only and not a reconfiguration of the servo arrangement... (IMO)

Been there, done that and old enough to know better.....

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02-20-2017 06:23 PM  8 months agoPost 16
RM3

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Killeen, Texas - USA

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thats correct...
like I stated, been flying the same CGY750 for over a year... no crashes. Then one day, on my third flight coming out of a stall turn, my collective and cyclic get weird. pulling back on cyclic trying to nose up and the collective drops, apply collective and the nose dips.... it eats it.

get it home, inspect the wreckage, I cant find any disconnected wires, RX pack is still good on charge (it was thrown clear of the crash, unplugged from BEC), tear it completely down.

after making some parts, and getting the donor parts put together, wire everything back together (all wires are marked with position) as it was previously, and the CGY750, is not responding correctly. it behavior is very similar to how it was acting in the air prior to the crash.

check the basic swash settings, and the servo combo is wrong... change it back to #3 (it was on #2).

#3 works for my heli.... #2 would have done caused the crash as described.

So is it possible for a single setting in the CGY to "spontaneously" change mid flight resulting in a crash?
And if a brownout were the case, it would cause a reboot only and not a reconfiguration of the servo arrangement...
exactly.
I also have a fail safe setup should the rx power drop: goto idle, set collective to zero.(BTW I also have capacitors on the RX to take care of any "noise"
remember though the heli was responding, but the resulting control was wrong.

showing a preference will only get you into trouble, 90% of everything is crap...

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02-20-2017 07:54 PM  8 months agoPost 17
tommytt1

rrVeteran

Mercerville, NJ, USA

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I had something similar happen to me. Nitro NX4, Mini Vbar, Fromeco LI ion, and a 5 amp 5.8v voltage regulator. On the bench it was fine, but on the first flight in a hover it went wacky. I got it on the ground ok and the channel assignments were changed and it stayed that way. I switched the channels around and messed with moving all the sticks around and it went back. To make a long story short, I switched to a 7.5amp regulator and flew it trouble free all last season.

I made a mistake once, but I was wrong?

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02-20-2017 08:40 PM  8 months agoPost 18
Pistol Pete

rrProfessor

Seffner, FL

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have a fail safe setup should the rx power drop: goto idle, set collective to zero.(
Where do you set this? FBL?

Asking due to not being familiar with that unit.

Did you ask Dr. Ben the rep?

~~Enjoying the hobby one flight at a time~~

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02-20-2017 10:55 PM  8 months agoPost 19
Heli_Splatter

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USA

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I was trying to think outside the box on what might have caused a problem during the flight... yes I agree on what normally might be expected, but this was not normal.

Don't know what else to blame except the electricity. I have never had an inflight control emergency.

Hope you figure it out.

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02-21-2017 03:19 AM  8 months agoPost 20
RM3

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Killeen, Texas - USA

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the fail safe is set in the radio (8FG-Super), this data is sent to the RX via the TX... if signal is lost or battery voltage drops below a certain level, RX responds by moving servos to predetermined positions.

whatever it was... will be testing on the ground (no blades) and see if anything flips...

for the moment, yeah, I dont trust the unit... I think Im gonna just trash it and get another... I sure as hell wont buy a used one.

I dont want to fly it, crash again and spend another week making/ordering parts.

showing a preference will only get you into trouble, 90% of everything is crap...

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HelicopterMain Discussion › Is it possible? FBL settings change...
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