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Old 05-28-2012, 02:07 PM   #1
frypan
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Default 750 Failure rate?

Ive been seeing more and more cases when the 750 is failing.
Have ya'll had any issues with it as of hardware failure?
I have 2 an now I'm thinking of selling them to get vbars.
Really dont want a heli to go crazy because of a FBL unit.
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Old 05-28-2012, 02:31 PM   #2
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Most likely pilot failure. lol
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Old 05-28-2012, 03:29 PM   #3
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Quote:
Originally Posted by flydan View Post
Ive been seeing more and more cases when the 750 is failing.
Have ya'll had any issues with it as of hardware failure?
I have 2 an now I'm thinking of selling them to get vbars.
Really dont want a heli to go crazy because of a FBL unit.
Get the new Skookum SK540 (metal case version for only $250) itís better than Vbar and is much more immune to vibration than the old SK720. If I had it to do again I would not get a CGY750 mainly because itís so hard to tune well. Skookum and Vbar are both very much easier to setup than CGY. Also I have never been able to get CGY piro comp to be as good as Vbar, SK720 or SK540.
 

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Old 05-28-2012, 03:45 PM   #4
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Originally Posted by RC Mike View Post
Get the new Skookum SK540 (metal case version for only $250) itís better than Vbar and is much more immune to vibration than the old SK720. If I had it to do again I would not get a CGY750 mainly because itís so hard to tune well. Skookum and Vbar are both very much easier to setup than CGY. Also I have never been able to get CGY piro comp to be as good as Vbar, SK720 or SK540.
 

.
I might, Dont know. I like the feel for the most part but I dont want my heli going crazy..
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Old 05-28-2012, 06:04 PM   #5
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I wonder about this. Is the FBL unit really failing, or are we just seeing links fail. I recently saw a heli that went nuts before it hit the ground. Upon inspection, a link was broken, so we're down to the chicken or the egg question. Did the link fail and the FBL unit was just trying to compensate? Or did the FBL unit fail and the link broke on impact. My personal opinion is the link failed and the FBL unit was compensating, producing the craziness in the air. Why do I think that? Because I have witnessed several link failures since I started flying helis in 2009. I have never witnessed a problem that I would blame on the FBL unit. Most weird FBL behavior that I have witnessed was ultimately blamed on vibrations. Once the vibrations were eliminated the weirdness stopped.

Let me be clear here, I am not stating that it's impossible for FBL units to fail. I'm simply saying it's far more likely for the mechanical side to fail. That is where I would initially focus were I to experience crazy behavior before a crash.

Just my 2 cents.
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Old 05-28-2012, 08:24 PM   #6
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Originally Posted by flydan View Post
Ive been seeing more and more cases when the 750 is failing.
Where? At your field, or reading online. Mine's been going well since I got it back from futaba. Was getting sensor error.
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Old 05-28-2012, 09:42 PM   #7
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Originally Posted by RC Mike View Post
Also I have never been able to get CGY piro comp to be as good as Vbar, SK720 or SK540.
 

.
???? I have never got any other fbl units to compare to the 750 tail it excels in that department! I have had my fair share of setups also vbar,sk720,sk360,beastx,3g,tarot zyx. I have yet to see the other brands come close to the rotation rates and fff piros. All of the 750's at the field will piro in fff straight line the whole field out of the box no tweaking. All you have to do is go into forward flight hold rudder until you want to stop. All the other brands will go about 100ft and either start drifting or slow down out of fff.

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Old 05-29-2012, 06:16 AM   #8
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Originally Posted by skew View Post
???? I have never got any other fbl units to compare to the 750 tail it excels in that department! I have had my fair share of setups also vbar,sk720,beastx,3g,tarot zyx. I have yet to see the other brands come close to the rotation rates and fff piros. All of the 750's at the field will piro in fff straight line the whole field out of the box no tweaking. All you have to do is go into forward flight hold rudder until you want to stop. All the other brands will go about 100ft and either start drifting or slow down out of fff.
Try Vbar
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Old 05-29-2012, 06:40 AM   #9
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If you have read my post! I have tried multiple vbars mini, full sized, black and blue, on multiple helis. I even pulled off my 750 on my 600e and put a blue mini on it did trim flight ect. I sold it and put the 750 back on and instant perfect tail control nice and fast.
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Old 05-29-2012, 09:00 AM   #10
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What CGY750's are failing? Never heard of it myself.

And if you jump ship, now's a bad time. Wait until the MSH brain and Spartan FBL units have been released and evaluated first.
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Old 05-29-2012, 11:01 AM   #11
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Before I buy one of your 750s - what cases have you seen?

I'm not seeing any online yet...
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Old 05-29-2012, 11:46 AM   #12
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only failure mode I had was cooked servos. that combined with how it flew was enough for me to toss it.
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Old 05-29-2012, 12:30 PM   #13
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Quote:
Originally Posted by el guapo View Post
only failure mode I had was cooked servos. that combined with how it flew was enough for me to toss it.
What servos tail, cyclic what brand?
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Old 05-29-2012, 03:10 PM   #14
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Originally Posted by vboy55 View Post
What servos tail, cyclic what brand?
align DS510s on cyclic running less then 6V.

moral of the story is that you can cook your cyclic servos with the "head response" parameter. you have to make sure your servo temps are OK. in the first iterations of the firmware it was not user settable, and in the 2nd iteration they turned it up. which is when I had my failure.


this is a quote from the firmware release for the third iteration of firmware. which was released a week after my issue failure.

Head response

"This selects the matching of the head response
and gyro operation. The value 1 is the selection of
fastest response. In case of a slower head response
or slower swash servos, the performance can be
improved by increasing the response value, more
gyro gain can be obtained and the servo power
consumption can be reduced. The servos will be
cool down."
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Old 05-29-2012, 03:39 PM   #15
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Quote:
Originally Posted by el guapo View Post
align DS510s on cyclic running less then 6V.

moral of the story is that you can cook your cyclic servos with the "head response" parameter. you have to make sure your servo temps are OK. in the first iterations of the firmware it was not user settable, and in the 2nd iteration they turned it up. which is when I had my failure.


this is a quote from the firmware release for the third iteration of firmware. which was released a week after my issue failure.

Head response

"This selects the matching of the head response
and gyro operation. The value 1 is the selection of
fastest response. In case of a slower head response
or slower swash servos, the performance can be
improved by increasing the response value, more
gyro gain can be obtained and the servo power
consumption can be reduced. The servos will be
cool down."
+1 I would also like to add, Configuring your head response to other than fast does not necessarily mean exactly that. They will run manufacturers specks. I think they should have named that function more along the line of servo type, Which is exactly what it does.
Sorry about you fried up servos. I almost did the same with my 8717's.
I think they just gave that function a bad name.
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Old 05-30-2012, 09:19 AM   #16
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Mine works just fine and it was one of the first off the boat from Japan.
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Old 06-01-2012, 08:29 PM   #17
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+1
Then the 1.2 version is good for me too.
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