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Goblin 280 SAB Heli Division - Goblin 280 Helicopters


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Old 01-21-2018, 05:50 PM   #1 (permalink)
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Default Fireball 280 loss of power during midflight

My setup is a pulse 1050 45 C hobbywing 50-amp Platinum ESC BEC is set at 7.4 volts cyclic servos kst 215 tail Servo SAB DS12. Skookum 720 BE no GPS
testing tail on the280with some mild pitch pump then it cuts power drops regains power and I still had to hit throttle to hold it was falling too fast. maybe drop a cell I will check but it would not completely cut power can't think of anything. When I walked up to it it was powered on Pretty Dirty so I shut it down. Have a YouTube video Goblin 280 power loss mid-flight but letting my phone upload all day works fine anyway thank you for reading
I am out of answers

Last edited by backshed904; 01-21-2018 at 09:40 PM..
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Old 01-22-2018, 08:35 AM   #2 (permalink)
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[QUOTE=backshed904;7523749]My setup is a pulse 1050 45 C hobbywing 50-amp Platinum ESC BEC is set at 7.4 volts cyclic servos kst 215 tail Servo SAB DS12. Skookum 720 BE no GPS
testing tail on the280with some mild pitch pump then it cuts power drops regains power and I still had to hit throttle to hold it was falling too fast. maybe drop a cell I will check but it would not completely cut power can't think of anything. When I walked up to it it was powered on Pretty Dirty so I shut it down. Have a YouTube video Goblin 280 power loss mid-flight but letting my phone upload all day works fine anyway thank you for reading
I am out of answers. Here is a link haveing trouble uploading. Around 1:50 in the flight it drops and tries to regain.
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Old 01-22-2018, 12:16 PM   #3 (permalink)
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Sudden loss of power like that will 9 times out of 10 be due to a bad soldering joint either in your motor/esc wires or you battery/esc wires. Also, make sure your throttle signal wire (the one that comes off the ESC and plugs into the FBL) is well secured into the FBL Unit. If you're using and ESC with an internal BEC, a loose connection here will cause the entire system to lose Rx power.

What kind of FBL are you using? What ESC? Are you running Spektrum, Futaba, Vcontrol? etc. Provide more details.
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Old 01-22-2018, 04:12 PM   #4 (permalink)
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Quote:
Originally Posted by DCflyer View Post
Sudden loss of power like that will 9 times out of 10 be due to a bad soldering joint either in your motor/esc wires or you battery/esc wires. Also, make sure your throttle signal wire (the one that comes off the ESC and plugs into the FBL) is well secured into the FBL Unit. If you're using and ESC with an internal BEC, a loose connection here will cause the entire system to lose Rx power.

What kind of FBL are you using? What ESC? Are you running Spektrum, Futaba, Vcontrol? etc. Provide more details.
I thought I listed my set up in the beginning but I look back on the data sheet for Skookum 720 and I never lost power as far as the flybarless system shows .03 to .07 very very good. I knew from my set up. As look down the data sheet all seems fine acept when it hit the ground and it registered 26.7 in magnitude. I have a video it's on YouTube I can't get it to load up here when I walked up to it it was still powered on when it was flying it sounded fine and then it's almost like I hit throttle hold and then switched it back on which I know I didn't do. I would never ask the question I would simply pretty much figure it out but if you listen in the video you will see that will make you think
"Goblin Fireball 280 loss of power mid-flight" you tube
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Old 01-22-2018, 04:32 PM   #5 (permalink)
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Just copy/paste the link.

SAB Goblin 280 power loss in mid flight (3 min 4 sec)
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Old 01-22-2018, 04:39 PM   #6 (permalink)
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Very strange.

From the sound, it's like you all of a sudden lose power, but then the motor revs up back again but you get no lift. As if the shaft had de-coupled from the motor. Weird. I don't have this particular heli so it's hard to tell.

EDIT: heard it a couple more times. looks like the motor goes off then back up gain. If you had lost the FBL (full loss of power aka brown-out), you would have to wait until initialization. So to me looks like there is something wrong with your motor. Looks like you lose the motor, then regain it and likely you flipped the heli and thus the large "THUD" sound on the crash. Doesn't sound like it just "dropped from the sky" but more like slammed into the ground. I would say that the only thing that loses power momentarily is the motor. I don't know if someone else agrees with this theory.

EDIT 2: just brainstorming here. Or the ESC bailout kicked in and revved the motor back up after a loss of throttle signal. So maybe as DCFlyer said it's a bad ESC throttle wire. Maybe all the way down to the ESC. I think since the ESC is cheaper than the motor you could start by replacing the ESC. But again just brainstorming. On issues that are difficult to troubleshoot, sadly the best way is to simply start replacing components until you find the cause.

Quote:
Originally Posted by backshed904 View Post
I thought I listed my set up in the beginning but I look back on the data sheet for Skookum 720 and I never lost power as far as the flybarless system shows .03 to .07 very very good. I knew from my set up. As look down the data sheet all seems fine acept when it hit the ground and it registered 26.7 in magnitude. I have a video it's on YouTube I can't get it to load up here when I walked up to it it was still powered on when it was flying it sounded fine and then it's almost like I hit throttle hold and then switched it back on which I know I didn't do. I would never ask the question I would simply pretty much figure it out but if you listen in the video you will see that will make you think
"Goblin Fireball 280 loss of power mid-flight" you tube
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Old 01-23-2018, 12:43 AM   #7 (permalink)
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I can't see the video but from the description this sounds like LVC (low voltage cuttoff)
This is especially likely in cold weather. Have you tried reducing the LVC value?

The fact that it occurred during a pitch pump points strongly to it being LVC rather than a random radio glitch.
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Old 01-23-2018, 11:56 AM   #8 (permalink)
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Quote:
Originally Posted by backshed904 View Post
My setup is a pulse 1050 45 C hobbywing 50-amp Platinum ESC BEC is set at 7.4 volts cyclic servos kst 215 tail Servo SAB DS12. Skookum 720 BE no GPS
testing tail on the280with some mild pitch pump then it cuts power drops regains power and I still had to hit throttle to hold it was falling too fast. maybe drop a cell I will check but it would not completely cut power can't think of anything. When I walked up to it it was powered on Pretty Dirty so I shut it down. Have a YouTube video Goblin 280 power loss mid-flight but letting my phone upload all day works fine anyway thank you for reading
I am out of answers
SAB goblin fireball 280 loss of power in mid-flight (1 min 32 sec)
https://m.facebook.com/story.php?sto...00009500146723

Last edited by backshed904; 01-23-2018 at 12:32 PM.. Reason: Add video
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Old 01-23-2018, 01:02 PM   #9 (permalink)
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Default thanks for the help uploading

Quote:
Originally Posted by toadiscoil View Post
thanks i thought thats what i was doing but it works from face book that way
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Old 01-23-2018, 04:30 PM   #10 (permalink)
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Electrostatic discharge...That exactly what it looks like...did you run the ground wire?if you did, did you securely solder both sides? If so, did you scrape the motor plate until the black anodizing came off? if any one of these issues was not done, that's your answer...almost guaranteed...
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Old 01-24-2018, 03:36 PM   #11 (permalink)
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Quote:
Originally Posted by rchelipastor View Post
Electrostatic discharge...That exactly what it looks like...did you run the ground wire?if you did, did you securely solder both sides? If so, did you scrape the motor plate until the black anodizing came off? if any one of these issues was not done, that's your answer...almost guaranteed...
took it out today without any issues actually ran the battery lower I did not scrape the anodize I figured the screw threading would catch enough of that I did run it inside the plastic tail boom I have the carbon fiber boom on there now I will check that again and make sure
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Old 01-28-2018, 07:10 AM   #12 (permalink)
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To rule out a LVC issue, where is yours currently set to and is it set to "soft"? You could lower the LVC point quite a bit to see if it goes away.

IMO, sounds like a static hit. This will usually cause a signal loss then to fail-safe which kills motor power. Power still remains to everything and the motor will try to start back up immediately if you have not hit TH once signal is regained.
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Old 01-29-2018, 04:47 AM   #13 (permalink)
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I was a condition called load soar from rotor lockout similar to what you're saying... Not a ESD IT WAS GROUNDED LOOK
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Old 03-31-2018, 03:52 PM   #14 (permalink)
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Default ever resolved?

Backshed,
Did you ever get this issue resolved? Had my g280 go in a couple of days ago in what sounds like a similar problem. Different FBL (ikon2) but otherwise sounds similar. Sudden drop into the ground at slow forward level flight. I'm suspicious of a static hit as I didn't have the static kit installed but belt was well lubed with silicone. Looks like you had the kit installed so now I'm wondering again.
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Old 04-01-2018, 09:18 AM   #15 (permalink)
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Quote:
Originally Posted by tvoth3 View Post
Backshed,
Did you ever get this issue resolved? Had my g280 go in a couple of days ago in what sounds like a similar problem. Different FBL (ikon2) but otherwise sounds similar. Sudden drop into the ground at slow forward level flight. I'm suspicious of a static hit as I didn't have the static kit installed but belt was well lubed with silicone. Looks like you had the kit installed so now I'm wondering again.
--Tom
Mine got taken down twice by static. Did you some testing to verify and yup. Installed the static kit and all good. Killed my mini vbar though.

I silicone my belts too. Didn't help in this instance.

Verify that everything stops working though. If it's a static hit servos, motor will stop briefly or for a while. Then start right back up depending on your radio system and settings.
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Old 04-01-2018, 12:28 PM   #16 (permalink)
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Quote:
Originally Posted by Thickfog View Post
Mine got taken down twice by static. Did you some testing to verify and yup. Installed the static kit and all good. Killed my mini vbar though.

I silicone my belts too. Didn't help in this instance.

Verify that everything stops working though. If it's a static hit servos, motor will stop briefly or for a while. Then start right back up depending on your radio system and settings.
OK. Thanks Thickfog. When I rebuild I'll be sure to use the static kit.
Tom
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Old 04-02-2018, 05:09 PM   #17 (permalink)
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That's for sure an electrostatic discharge I just had the same thing happen once close to the ground and the second resulted in a crash. You have to completely grind away the hard powdercoating and solder it up right and your golden
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