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  • Bad Raven: Balance lead extensions are pence from China, I bought bulk. I also cut the old balance plugs with lead off and if I get a broken plug body I just solder a new one lead to lead, can extend at the same time.
    Today at 14:17:22
  • Reman: Bajadre, With reference to balance leads, I bought a cheap JST XH crimper, plus a shed load of male/female plugs and pins a while back. It's amazing how many times that lots come in handy. Not just for repairing battery packs, But for things like adding quick release plugs to wiring harnesses so you can do things like pop gimbels on and off camera drones quickly, Or add plugs to the cables of hardwired components so you don't have to desolder them when you need to get them out of the way in a rebuild, And making charging extension leads so you can get the battery right into a Li-Po safe bag and away from the expensive charger. They're well worth adding to the toolbox..... The other day I only spent about 5 minutes hunting for my 4S charging lead before giving up and making a new one. If I didn't have the crimping kit I'd probabbly still be looking. :)
    Today at 14:00:55
  • hoverfly: Not unusual Reman, they just cant be ar$ed to deliversome if they get behind schedule.. Yesterday i had a delivery by Herpies,  got a sms telling me when they were going to deliver, then rang the door bell and knocked. The parcel was intact and damage free.  Not sure what is going on.... :hmm:
    Today at 13:23:11
  • Bad Raven: Where is it broken?
    Today at 13:22:29
  • hoverfly: If you cut them off make sure  you insulate the ends. :smiley:
    Today at 13:18:42
  • Bajadre: Quick question guys is it ok to snip off a broken balance lead and not run it i know i wouldnt be able to balance charge it again but would the pack be ok ? its a 3s 5500mah which the lead got dragged along the floor on sundays bahs :(
    Today at 12:44:55
  • Reman: About an hour ago I had the Yodel tracking system tell me that I wasn't in...... That's f*ckin' news to me !!!!!
    Today at 10:17:20
  • Reman: Like I said, In the past I've had a handful of packs "Go off" at me like fireworks after bad crashes (Usually with RC helis), So it's hard to get that image out of your head while stripping down Li-Po's. :)
    January 21, 2019, 11:22:54
  • shawdreamer: the horror stories will always incite worry when messing about with Lipo's but its the same as everything else when working on electronics alike, alsong as your careful and methodical there's very little to panic about, I regularly recycle 4s's with a single dead cell into usable 3s packs, end of the days its alot more economical, safer and enviro friendly than having to bin them....just a pain that the dead cell is NEVER one of the outer cells so you always end up having to strip a good cell off to get at the bad cell before putting it back afterwards, its like dropping toast, it'll always land buttered side down and inevitably covered in pet fur :angry:
    January 21, 2019, 00:11:16
  • Reman: Just did the one electrical job that still scares me. I dismantled some Lipo's with knacked cells and built usable packs out of the good cells. I've had packs go "VOOOOOOSH" at me in the past so I'm always slightly scared of having bare lipo contacts anywhere near what I'm working on, But all appears to have gone well and one of them is currently doing a charge/discharge cycle to make sure nothings a miss. :)
    January 20, 2019, 22:28:43
  • Reman: My original Dremel Pro made it to 14 years of heavy weekend use (And abuse) before it crocked. Dismantled that but it turned out to be a "Control module" fault, And Dremel made it ni on impossible to get into that without pooching it completely. :(
    January 20, 2019, 22:17:27
  • ched999uk: BR  ::)
    January 16, 2019, 22:26:54
  • Bad Raven: That's a warrnty claim if ever I heard one....
    January 16, 2019, 20:32:55
  • ched999uk: My 28 year old 12v 35w Weller soldering iron failed  :( I didn't fancy forking out £100 for a new one. Stripped it down and found conductor snapped in cable. 10Mins later all back working great. :smiley: ::) I am very happy!!
    January 16, 2019, 17:23:06
  • shawdreamer: "look up there....its a drone!.....and whats this noise?..... it cant be!....NOOOOOOOO.......OOOOOOOOOOOOOPS I DID IT AGAIN, I PLAYED WITH YOUR HEAR....."
    January 10, 2019, 14:17:24
  • shawdreamer: <starts downloading britney spears albums and preping his large frame to carry a PA system>
    January 10, 2019, 14:15:08
  • Bajadre: defo steveo :) we should get loads of drones together up there so how they handle more that one lol
    January 08, 2019, 19:39:07
  • steveo9007: its all a ploy to get who ever has won the contract for geofencing the airport in, i reckon  ::)
    January 08, 2019, 18:38:26
  • Bajadre: more lies hope they prepped the police staement already lol
    January 08, 2019, 18:27:49
  • Bad Raven: Take Offs resumed
    January 08, 2019, 18:24:45

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Author Topic: Some help setting up please  (Read 1499 times)

Offline Kez

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Some help setting up please
« on: February 27, 2017, 15:30:15 »
I have the following :

Logo 400 v bar
K bar mini
frsky d4r / 9xr pro tx

The heli and fbl controller have been flown with a spektrum before, so generally should be set up. I';m using my rx in ppm mode plugged straight into the k bar (esc plugs into that too).
The issue i have seems to be with the tail rotor. Without the motors running, the servo seems slow to react and doesn';t go back to centre when i let go of the stick. Attempts to take off result in the heli rotating wildly. The gyro/tail is doing nothing at all.
I haven';t had a heli for around 10 years and fbl stuff is all new to me.
Can anyone give me an idea where this is going wrong?

Offline Mark_Felton

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Re: Some help setting up please
« Reply #1 on: March 20, 2017, 03:19:46 »
Hi not sure if you have this sorted yet, but generally speaking if a heli rotates wildly about its axis its generally due to the tail servo being reversed, as in not going right way.  If you push rudder stick left the tail slider will go right, out away from the tail boom and if you push right the tail slider will move to the left towards the tail boom.
The FBL I am not sure about as I do not have one on my 500, but there are plenty of heli forums and a quick google will probably help.,29036

Offline Two-Six

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Re: Some help setting up please
« Reply #2 on: March 20, 2017, 10:31:45 »
Hi Kez,
One thing, it might be that your tail "gyro" sensitivity is set too low or off or not in heading hold mode but in rate mode..or something.  I have a MSH Brain on my Trex 450L.  With my Taranis I can change the gyro setting using a rotary knob.  I will set it with a switch very soon once I work out what it should be set to. 

At the moment I can tweak it "on the fly".  I am only concerned about heading hold mode right now and if the gain is too high the tail twitches or starts to oscillate more and more as the gain goes up.  The sweet spot is just below the level where it starts to twitch when hovering.  More advanced pilots will start to do piros and look for how it recovers from big rudder inputs and the hold they get doing more demanding moves that need need big pitch changes.  That';s beyond me right now.

As far as I know rate mode is for scale pilots or something, no idea really why people would want to use it.

The settings go a bit like this ( I haven';t looked at it for a while)  -100 rate mode 0 off +100 max sensitivity heading hold mode.

You need to check if the tail servo compensates when you move the heli by swinging the tail from side to side.  It should twitch and move the blades in the right direction to act against the movement.  They will then creep back to centre when the tail is still.

You also need to make sure the cyclic servos compensate in the right direction for pitch and roll by moving the heli about and watching how the swash plate moves.

You might also want to check that the drive shaft is not slipping.  If the tail boom is moved out a bit it could slip.  This problem is more common on belt drive tails.

Also you could try posting here:

and perhaps these vids will help.
! No longer available
this one isn';t so good:
! No longer available
Nighthawk Pro, Trex 450 L Dominator 6 cell *FLOWN*, Blade 450-3D, MCPX-BL, MCPX-V2, Hubsan X4, Seagull Boomerang IC .40 trainer, HK Bixler, AXN Clouds fly,, Spektrum DX7, Taranis, AccuRC

Offline Kez

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Re: Some help setting up please
« Reply #3 on: March 20, 2017, 12:11:13 »

Thank you for the info guys.
Since my last post I have discovered why it goes all spinny. The tail servo was reversed in the fbl unit software. Reversing it on the tx made no difference.
It will fly now, but seems hard to control and very unpredictable. I think its just a case of more setting up. A local-ish guy has offered to take a look so its just a case of getting over to one of their club meetings and getting it fixed