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Home✈️Aircraft🚁HelicopterFuel-Helicopters New or Limited ActivityNext D › Rave ENV Crash – Did my heli go temporarily insane?
04-26-2011 03:53 AM  10 years ago
es1co2bar3

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Atlanta GA,

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wrathofkhan
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Location: LA, CA - US

My Posts This: Topic Forum I had issues with the satellite RX not working properly. Took me a while – 3 minor crashes to figure out, that it was actually was the satellite RX causing it. But, every time it did happen, the heli would go in fail safe mode, and since my altitude was relatively low, heli was leveled, so … the crashes weren’t that bad (nothing even remotely close to the photos on this post).

Just to give you little background on my microbeast setup, I have it on my 450 and have a satellite adapter + spectrum satellite unit. The wiring between the RX and MB was the issue, after I changed the cord – the problem was solved.

Cheers, Khan
Are you saying that this thing don't work with the satellite ?
i want to go the beast-x route; regardless of it flaw and because it a $100 less than the v-bar,now" if it doesn't work well with satellite
i'll have to screw it.
but if i
I was waiting on some honey but there aren't no Queen bee,
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04-26-2011 03:54 AM  10 years ago
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Can we safely say, that the battery is running out of juice on the 3rd flight?
No. I checked it right before the flight. Was at 7.5 volts.
Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know
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04-26-2011 03:54 AM  10 years ago
Santiago P

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Dayton

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Wouldn't that same stress be applied if the heli was flybarred??
EDIT
The control ball off the blade grip will see the same load, consequent ones thru the FB mixers will not due to the geometry, all the way to the swashplate which sees a fraction of the load that the FBL system puts down.

I guess the link in question would be the one off the blade grip.
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04-26-2011 04:02 AM  10 years ago
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Beast X does not recommend running multiple high current draw servos through th MB, I know many people are,and are getting away with it so far,,,, I'm not saying thats what caused it just an idea. If I can find the email I will post it from Stefan at Beast X if anyone is interested
.

Yes, I'm interested.

However, I was not running high current draw servos through the MB unit. The BeastX is upstream of the regulator. What this means is that the Battery connects directly to the ReactorX & the servos connect to the ReactorX, so the BeastX never sees a large current demand.
Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know
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04-26-2011 04:12 AM  10 years ago
PC12DRVR

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USA

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Sounds like you were good then.

Here was my question to Beast X:
Hello,

I have two Align 700 helis one Nitro one Elecrtric both use JR 8717
servos for cyclic. I have a microbeast installed on each one, and am
running 2S lipo power from an Spektrum AR7100R to power the MB and
servos. I know the MB is rated to handle 8V but I am reading more and
more on the online forums that it is not advisable to run multiple
high current servos through the MB due to the current draw? What is
your determination on this subject?

I can simply remove the power leads to the cyclics and plug them directly into the AR7100 for power only, leaving the signal wire connected to the MB. Please tell me what you advise.
Here is the response:
Hello,

yes it's a good idea to supply the servos separately. Although the MB was designed for the future to use 2s Lipo directly and this also worked out in our tests I hear more and more of problems with such servos. So at this time there are real power servos on the market and especially some new HV servos can draw an extreme amount of peak current so it is better to supply the servos with a separate power line or even better with a special voltage regulator like reactor X or Gryphon regulator.

The problem is not alone the Microbeast unit which should handle about 15 Amps internally but keep in mind that a single servo connector only can handle 2,5Amps without any voltage losses. So even two servo connectors/power lines from the lipo to the Microbeast are not that much..

best regards

--
Stefan Hornstein
BEASTX Team
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04-26-2011 05:06 AM  10 years ago
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Well, we certainly couldn't have a link issue if all the links were still connected.

So I just checked what's left of the heli...

And guess what? One of the links from the swash to the blade grips was missing.

So - could be the cause... or could have popped off in the crash....

Hmmmm................
Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know
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04-27-2011 09:24 AM  10 years ago
Sean Williams

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Santa Clarita CA

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Without actually seeing the crash this all just speculation but...

You said it shook violently before it went in. Do you mean that it just suddenly jerked off into one direction or was there a more pronounced shaking?

And pronounced shaking over a period of time, however short it was, would suggest some sort of mechanical failure - servo arm, linkage, whatever - as it makes it's way up the rotor head.

If it was just one pronounced movement to the ground, then your most probable cause would be something electric. About a year ago I had an electronic nag that would cause sudden, unpredictable movements that would only last for a second or two. It took some time before I was able to trace it back to a faulty connection on the board of one of the servos, as the problem was not replicable on the bench. Electronic ghosts are hard to deal with because without being able to conclude with certainty that the problem is fixed, you are risking a bird in the air that may be uncontrollable at any point in time. Good luck with figuring this one out.
Team Avant
Team Triforce
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04-27-2011 11:36 AM  10 years ago
InvertedDude

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Buckeye

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..
..
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04-27-2011 02:10 PM  10 years ago
spiccolli99

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phila,pa-usa

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been better seein it in video.
Seen many crash pics. Dosent justify what could have gone wrong. A video may have been a lil better explanation...lol. crashes happen...
which way is it going dude!!!!!!?? am i inverted??
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04-27-2011 02:31 PM  10 years ago
jbdww

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Round Rock, Texas

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I would put my bet on a link. I had my ENV do the exact same thing where it went nuts, but my ball that goes into the blade grips broke instead, because I over tighten them. I got very lucky on mine as all I lost was skids because I hit throttle hold and I was low to the ground and by luck it landed flat on the skids, so I know it was the ball that broke. The blades do not weather vain as the blades act like a flag and flap in the wind causing huge amounts of pitch changing causing the FBL to try to correct for it.Skids Up
http://www.jbdww.com
http://twitter.com/jbdww/
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04-27-2011 02:41 PM  10 years ago
scott s.

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Orange, Ca.

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Sorry for your loss
I can relate, when mine went in the tail had let go and started to piro so i hit hold and let it fall so it wouldn`t hit anyone.

damage so bad i could never figure out what went wrong.

more than half the cost of the kit to fix
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04-27-2011 04:30 PM  10 years ago
Wedge77

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St. Charles Missouri USA

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Ok, had a guy at our field that his heli did almost the same thing. His started pumping up and down so fast.. I was looking at him like wtf are you doing, but it was pumping collective fatser then any human fingers could move it. It had an align 3g unit on it, and come to find out one of the servo wheels was loose, and wasnt grabbibng all the way so the 3g was pumping controls to it so fast trying to compensate. it looked about like yours, hit so hard drove part of the reciever through the CF sideplate.JR NEX E8, 12 cell
Goblin 630, 12 cell
Vibe 50N Fbl
Century E640 Fbl, 12 Cell
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04-28-2011 01:20 AM  10 years ago
Big Edge

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Oldsmar, FL USA

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Saw a 700N FBL go in this weekend.. We also deduced losing a link to the blade grip was the issue.
Maybe using a small washer to keep the link connected if it pops off the ball would be a good idea.
-----------------------------
Don't taze me bro...
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04-28-2011 05:54 PM  10 years ago
Santiago P

rrProfessor

Dayton

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And pronounced shaking over a period of time, however short it was, would suggest some sort of mechanical failure - servo arm, linkage, whatever - as it makes it's way up the rotor head.
Amen to that.

I do not know if the ENV links come already sized correctly.
Older JR, all TT, Compass, and Align are NOT sized correctly out of the bag.

On FBL setups folks MUST TAKE THE TIME to properly size the links otherwise you WILL get improper wear and premature failure. This may be consider an old school procedure, but worth doing to make sure you new heli has a chance to grow old and not die on the third flight.

I still insist that the stresses on all your FBL control linkage are higher than the legacy FB setups. Ignore the diference and you may be in for a surprise.

By no way I am implying that the ENV links are inadequate, Curtis and company would have jumped thru the roof to advice and correct an issue like that. You don't see him or Nick popping them out in competition or demos.

Be aware that with super fast and strong servos, fast radio links, and CCPM setup ANYONE CAN induce an input so abrupt to stress anything out. (not implying either that Rockohaulic did so)
Best pilots in the world are very smooth, says alot for respecting the system they fly. Maybe some day stickbangers wannabe will realize that 3D is about perfect, intricate, precize imputs to take the helicopter to extreeme moves through the air, not about slapping the stick to the corners of the gimbal and expect the expectacular.

Then again you may get expectacular, but only once...

Santiago

"stay thirsty my friends" the drunkest man in the world
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05-02-2011 06:29 PM  10 years ago
spiccolli99

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phila,pa-usa

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that would make sense
very well said monypit
which way is it going dude!!!!!!?? am i inverted??
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05-02-2011 09:11 PM  10 years ago
JR-ric

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newport news VA

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Best pilots in the world are very smooth, says alot for respecting the system they fly. Maybe some day stickbangers wannabe will realize that 3D is about perfect, intricate, precize imputs to take the helicopter to extreeme moves through the air, not about slapping the stick to the corners of the gimbal and expect the expectacular.
what was said thier about actual 3D and what people/judges look for in the xfc and 3dm and so on is right thier..

very well put
Ricardo Maldonado
Team Curtis Youngblood Enterprise
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