RunRyder RC
 2  Topic Subscribe
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 2035 views POST REPLY
HomeAircraftHelicopter
e-
Hirobo Embla - SRB Quark - Lepton
› Kora 15-12, CC80, bobbing and stuttering beeps
03-04-2008 01:05 AM  10 years agoPost 1
balbs

rrKey Veteran

Los Angeles, CA

My Posts: All  Forum  Topic

I tried to maiden my new lepton today. Here's my setup

Kora 15-12 w\21T pinion
Castle Creations Phoenix 80
JR G770 Gyro
JR 3400G tail servo
3 X Airtronics 94761Z for cyclics
Medusa 6V 3A BEC
EvoFlight 4S 3700
AR6200 RX

Yesterday I spooled her up for the first time...sweet quiet thing just went straight up and tracked perfectly. I had a mild wobble around 1/4 stick but that stopped once the headspeed was up and the blades settled in on the grips. Anyway about a minute into the hover, it seems the motor or ESC just cut off. It just lost power and dropped. Luckily I was only a foot off the ground. I tried to bring it back up and it wasn't responding. However, the cyclics were working fine. I unplugged the battery and reconfigured the ESC to disable the current limitting thinking it might be that.

With the battery recharged, I spooled it up again this morning. It went up. But this time it seemed to be bobbing forward and backwards (not tail side to side). It didn't do that the last time.
I read before that it could be due to a low head speed? I landed it and looked around the heli for anything obvious. All electronics felt cool since it was less than a minute flight.

I plugged the battery back in. The ESC armed. I tried to spool it back up but there was just a stuttering beeping sound and the motor won't turn. It was just a machine-gun like beeping sound coming from the heli and the motor is not turning.

Can somebody tell me what's going on?

Off the top of my head my ESC settings are:

AutoLipo
soft cutoff
brake disabled
Motor Low Advanced timing (per Castle Creations tech on Outrunners)
Throttle Response Low (per Castle Creations tech)
Throttle Fixed endpoints
Motor timing is 11KHz

Can somebody help me out?

Thanks,

Balbs

PM  EMAIL  GALLERY  Attn:RR  Quote
03-04-2008 01:44 AM  10 years agoPost 2
Tail_BoomStrike

rrKey Veteran

N.A.

My Posts: All  Forum  Topic

AutoLipo
soft cutoff
brake disabled
Motor Low Advanced timing (per Castle Creations tech on Outrunners)
Throttle Response Low (per Castle Creations tech)
Throttle

Those settings are not good for high pole count motor like Kora......

Always run medium or high timing for high pole count. You want a medium and quick throtle response for helicopter......

Also CC has a weird throtle range...... Mine is subtrimed 10 points down. End points are 108% both directions.....

Those combined with throtle curve not dialed in...... Could be the cause of all the issues your having.....

Did you BTW setup your ESC by throtle or by CC link?

PM  EMAIL  GALLERY  Attn:RR  Quote
03-04-2008 08:04 AM  10 years agoPost 3
balbs

rrKey Veteran

Los Angeles, CA

My Posts: All  Forum  Topic

I used the CastleLink. Yes, I also had to adjust the lower subtrim to get the ESC to arm. I reset the throttle response to medium and timing to standard. I'll try again tomorrow.

Thanks,

Balbs

PM  EMAIL  GALLERY  Attn:RR  Quote
03-05-2008 12:32 AM  10 years agoPost 4
Tail_BoomStrike

rrKey Veteran

N.A.

My Posts: All  Forum  Topic

OK... I looked up the max timing for medium... It looks like it max's up to 20* only... So you need high timing.... 14 pole motor need 24* to perform efficiently with power.... For subtrim.... Did you mean, subtrim in the programming menu, or flight trim, the one next to throtle stick?.... Give this a try... Leave the flight trim to neutral..... Then go to programming menu for subtrim, dial it 10 popints down, go to your atv(travel adjust), dial 108% both ends.... Lowering the subtrim alone, to arm, the high throtle position deminishes. CC should now be happy with the resolution...

Now, for castle link, you might want to play between 1.56 beta and 1.55 final firmware for you ESC.....

Throtle fixed end points,,,, I assume your refering to Helicopter fixed end point..... So you should be good on that...... Spool up speed,,,, you should be good with fast spool up...... Slow and medium, is just too darn slow..... I find it always best for helicopter to set throtle response to High....

PM  EMAIL  GALLERY  Attn:RR  Quote
03-05-2008 01:59 AM  10 years agoPost 5
balbs

rrKey Veteran

Los Angeles, CA

My Posts: All  Forum  Topic

Subtrim on the menu. I lowered it to 6 and that's when it armed. I gave it a couple of more points (8)lower just to make sure. I also have the travel currently set at +-110.

This morning I tried running it at medium timing. It works, I had it hovering about 5 feet just to test it out. All of a sudden the throttle seemed to drop again. I saved the heli with a fairly hard landing. I spooled it up and tried again. I was hovering again about 6 feet. All of a sudden the tail whipped around. It seems I also lost control and the heli smacked into the tree I was hovering next to I don't know if I got a glitch or what. Maybe it explains the throttle going down and back up.Damage was the stock blades, tail pitch plate, and bent tail shaft. Man this sucks!

When the parts come in I'll try setting the CC for high timing. BTW I already have 1.55 of the firmware.

Thanks,

Balbs

P.S. also sucks that it seems nobody has any blades 425 or 430mm blades in stock for the lepton. But I managed to find some cheapy $40 set from helihobby.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-05-2008 08:22 AM  10 years agoPost 6
balbs

rrKey Veteran

Los Angeles, CA

My Posts: All  Forum  Topic

Woops...I must be on crack...I have a CC 80, not 60. I edited my post.

"14 pole motor need 24* to perform efficiently with power"

Where do you get this info? I can't find it at Castle Creations site?

Balbs

PM  EMAIL  GALLERY  Attn:RR  Quote
03-05-2008 12:01 PM  10 years agoPost 7
Tail_BoomStrike

rrKey Veteran

N.A.

My Posts: All  Forum  Topic

I have older version of the manual...... It shows the timing range of low, medium, high timing...... For timing required, the generatl conception is 0-5* 2pole, 0-10* 4pole, 0-20*6pole, 20-30* 8pole or higher..... Now the kv constant also come in to play..... You can have lower pole count motor that have high kv rating..... In that case, you go higher timing or the motor will spin slower and eat more amps and so on...... Here's another one.... You could have low kv motor, low pole count...... You run it high rpm by having more cell count to power it..... Same thing required, increase timing to have efficient power.....

It's a power game.... A balancing act..... The object is to win or break even (or trade off)......
I have to add.... If the timing is not right..... There is also a good chance the motor, will rotate opposite direction...... This could occur during spool up, or will in normal operation.... Depending on the ESC,,,,, an error is generated,,,,, and cut the power....
What radio are you using?.....

PM  EMAIL  GALLERY  Attn:RR  Quote
03-05-2008 06:00 PM  10 years agoPost 8
balbs

rrKey Veteran

Los Angeles, CA

My Posts: All  Forum  Topic

I'm using a JR 9303 with DSM module.

Balbs

PM  EMAIL  GALLERY  Attn:RR  Quote
03-05-2008 08:40 PM  10 years agoPost 9
Tail_BoomStrike

rrKey Veteran

N.A.

My Posts: All  Forum  Topic

It shouldn't be too different from my DX7......

Anyways, I really think it's just ESC settings. Give the 1.56 beta a try minehave worked better with that version.......

Ah, another thing there's a current consensus, that 2.4ghz's need to be rebinded whenever you make adjustments..... Or risk having lock outs.... It happend to a couple of guys I fly with...... When they spoke to Spectrum, that's what he advised......

PM  EMAIL  GALLERY  Attn:RR  Quote
03-05-2008 08:49 PM  10 years agoPost 10
Fernando

rrApprentice

Madrid

My Posts: All  Forum  Topic

Tail, do you happen to know the pole count for the axi 2826.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-06-2008 01:33 AM  10 years agoPost 11
Tail_BoomStrike

rrKey Veteran

N.A.

My Posts: All  Forum  Topic

14 pole....

http://www.modelmotors.cz/index.php?page=113

balbs

What a coincidence..... I was flying my Lepton this afternoon..... I was doing some aerobatics....... Suddenly, my Lepton started pirueting like crazy I have no control of the tail whatsoever.....

So I flick the throtle hold, and hope my crash wouldn't incur much damage..... The the spinning of the tail slowed down.... I have control of everything except for the tail..... It was piruetting slowly as I autoed..... Finally, it touched the ground..... A little hard, but my Lepton survived without damage......

So I checked to see what caused it.... without touching the rudder stick, I saw the rudder servo arm twitching in one corner..... I moved the rudder stick, it it move to the opposite side and started twitching again.... The servo was 2 years old, and been to different crashes...... It used to be in my 450...... So the potentiometer might have been worn...... I have to get a new one..... Better 60 bucks now..... Than hundreds, in the next event it happens.....

PM  EMAIL  GALLERY  Attn:RR  Quote
03-06-2008 04:53 AM  10 years agoPost 12
balbs

rrKey Veteran

Los Angeles, CA

My Posts: All  Forum  Topic

That is a coincidence..You're lucky, no damage What's your setup?

So I performed a rebind. Weird thing, I had to reconfigure my esc settings on the radio to get the ESC to arm My new settings are 120 low and 98 high for ATV and 0 subtrim arms the ESC. The cyclics seem to work, but would I have to check on the servo trim settings? I'm worried now that the swash won't be level or something. What if I change the gyro gain settings and perform another rebind, would it affect other settings? Is this expected behavior?

Balbs

PM  EMAIL  GALLERY  Attn:RR  Quote
03-07-2008 12:24 AM  10 years agoPost 13
Tail_BoomStrike

rrKey Veteran

N.A.

My Posts: All  Forum  Topic

Well, there seems no obvious physical damage yesterday..... I have replaced the tail servo today..... Test flew it but I'm getting some weird vibration that I have to troubleshoot..... Darn, I hate chasing a problem that's trying to hide away.......

The way the spectrum guy put it, is that, when you adjust travels and didn't rebind, when the signal recieved exceed the one memorized..... That's when the fail safe kicks in.... so I'm guessing, Anything that have to do with ATV's and sub-trim needs rebinding.....

The set up on the video: 94761; 401, 9650 with 9257 gearset mod; CC 10 BEC; CC45; AXi 2826/8; 4S 3700 Evo20; 400mm MAH....

PM  EMAIL  GALLERY  Attn:RR  Quote
03-07-2008 12:58 AM  10 years agoPost 14
balbs

rrKey Veteran

Los Angeles, CA

My Posts: All  Forum  Topic

Hmmm...I wonder if that's the issue I'm having with the motor suddenly going out...

BTW...thanks alot for all your help with this. I really appreciate it

Balbs

PM  EMAIL  GALLERY  Attn:RR  Quote
03-07-2008 10:44 PM  10 years agoPost 15
Tail_BoomStrike

rrKey Veteran

N.A.

My Posts: All  Forum  Topic

Finally found out what's causing the vibration on my Lepton..... The spindle was slightly bent..... So, I had that replaced..... I just couldn't do test flight..... It's windy and raining today..... And tommorow it will be 25-35 mph wind.... That sucks..... Just when it's my weekend day off.... next weekend I'll be working....

PM  EMAIL  GALLERY  Attn:RR  Quote
03-07-2008 10:49 PM  10 years agoPost 16
balbs

rrKey Veteran

Los Angeles, CA

My Posts: All  Forum  Topic

Speaking of spindle....When I hit that tree, the main blades hit first, then the tail. When it fell to the ground (about 6 feet), the flybar was still straight and paddles are still aligned. Would that mean the spindle should be okay? Just wondering as I forgot to order a spare when I ordered replacement parts.

BTW, readyheli just got the stock blades in. I ordered a couple since I can't find other blades for the Lepton anywhere. Alot of places are out of stock.

Balbs

PM  EMAIL  GALLERY  Attn:RR  Quote
03-07-2008 10:58 PM  10 years agoPost 17
Tail_BoomStrike

rrKey Veteran

N.A.

My Posts: All  Forum  Topic

Well, on mine, what happend was, pretty much a piruetting auto..... It bounced a couple of times before it settled...... But I do believe you may have bent your spindle as well..... On mine I couldn't even tell.... Until I removed the grips..... and pulled the spindle out..... I rolled it on a flat surface and there I have it.... Tiny little bent.......

PM  EMAIL  GALLERY  Attn:RR  Quote
03-07-2008 11:12 PM  10 years agoPost 18
balbs

rrKey Veteran

Los Angeles, CA

My Posts: All  Forum  Topic

Okay, I'll tear the rotorhead apart tonight and check it out...Man, I just remember seeing threads about the JR 3400 being prone to stripping when used as cyclic servos. I just hope mine on the tail is okay since the tail pitch plate link broke.

Also, I just pounded the original tail shaft with a hammer and seems I got it as straight as I could. Rolling it on my glass coffee table seems okay. I don't see any noticable wobble on the tail shaft when I run it as well. Should I stick with it or just use the new ones that just arrived?

Balbs

PM  EMAIL  GALLERY  Attn:RR  Quote
03-08-2008 12:51 AM  10 years agoPost 19
Tail_BoomStrike

rrKey Veteran

N.A.

My Posts: All  Forum  Topic

If you got it that straight , then it should be good......

PM  EMAIL  GALLERY  Attn:RR  Quote
03-28-2008 12:16 AM  10 years agoPost 20
balbs

rrKey Veteran

Los Angeles, CA

My Posts: All  Forum  Topic

It's been awhile but I finally got some blades in and tried again with the updated settings.

I got it hovering okay. It got gusty so I occasionally had to land it. At one point, it got too gusty and I accidentally nicked the tail rotor on the asphalt while it's hovering close to the ground. I didn't land it until about a few seconds after that since I was still able to control it and was watching out for the throttle drops that I was experiencing before. It was pretty much just a touch and go with the tail rotor blades. Anyway, after I landed and wanted to take off again, the motor started stuttering again. It seemd to spin slowly while stuttering and when I even gave it full collective, the motor just died. I brought the throttle down and tried again and it did the same thing.

Upon further inspection, I noticed that the red LED on the CC80 was flashing 1 time intermittently. According to the ESC manual it indicates that the motor was stalled. I figured okay, could be the tail rotor nick that caused it. So I unplugged the battery, plugged it back in, and it's still doing the same thing with the motor stuttering. What gives????

Balbs

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 2035 views POST REPLY
HomeAircraftHelicopter
e-
Hirobo Embla - SRB Quark - Lepton
› Kora 15-12, CC80, bobbing and stuttering beeps
 Print TOPIC  Make Suggestion 

 2  Topic Subscribe

Tuesday, June 19 - 5:28 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online