Hi guys, i had a weird event today, trying out the uber cheap copterx flybarless unit on a trex600e.
Im running align610s and a BLS256 hv tailservo, which was brand spanking new for this project,cause i didnt want any dramas with the setup, i wanted to give its best chance. Ironically enough, this is the dearest component on this super cheap setup.

Basically i had a tail fail, and total tail control loss.
As luck would have it i had the ipad filming at the time. Heres the vid.....

So i was able to get it get it down fairly well considering, with only a bent rod and a broken u/c.

The tail servo was working fine when i got to the heli, and its been buzzing away on the bench for about two hours now, connected to a beastx, working just fine, being stress tested at random intervals.

Im at a loss as to why it failed like that in flight?

In the copterx unit, it has two choices for running a 760 centering pulse servo, on 250hz, and 400hz. I thought it seemed a bit jumpy, and twitchy on 400, so i decided to run it 250. I did two sports and speed flights eith the setup, before leaning on it a bit, and it worked just like they always do....perfect, all over the tail like a rash, no bouncing and a very dialled tail feel, like the beastx's that i love so much.

Fast foward flying had no hunting, and fast travelling piroetting was whip free. It even did piro pojos consitantly.

Does anyone else use this servo on this FBL unit with success ? If so, what settings are you using please?

Is running 250hz harmfull to the servo ?

Is this one of the servos, that miss out on the catagory of "most servos can be used with this unit "

My other theory was perhaps the power bus inside the unit isnt up to 4 full size servos loaded at once.

Anyone got any ideas ?

Thanks.
Chris.

Assumption is the mother of all F#@&ups.....

Running one here on my 700, mikado v-bar and gryphon regulator, one of the nicest feeling servos i have used.
Have outrage torque on my 600 with v-bar and it feels better than the outrage.
Have it set on bls 251 in the v-bar menu which is 760/333 i believe and have not had any issues with the 256 at all.

ATLRC wrecking crew / friendly flyers RC

Power bus is definitely a possibility.
For an application of this size, the ReactorX regulator would be great, as you could set it up for straight pass through voltage, but the power bus would run strong and consistent current to all your servos.

Chris

Chris,

The bls256 is used extensively in FBL units. The 250hz setting would not hurt it, it just under utilizes it.
The DS610, besides being a great servo and practical between 6V and 7.4 volts, you MUST feed it with a robust power bus. Three DS610 servos can easily pull over 5 amps in FBL duty.

It explains the moment you pumped the collective, the 610s might have swallowed all the electrons...

With everything plugged in in the "cheap" unit, Put in a voltmeter via and short extension across the BLS256, actuate the collective and watch for any serious voltage drop across/to the tail servo.

santiago

Hi gents, thanks for the advice, i spent this morning testing everything i could think of.

First off i calibrated my cheap multimeter against some known cooling fans. Two fans at .25 of an amp draw, the multimeter showed .5 amps.

Next i tested a single DS610 for amp draw, which gave about 3 volts stalled.

I then tested the bls256 for a stalled amp draw, and got 1.1 amps.

I then tested all four servos together, and was only able to peak out at 7 amps.

In this test, i used only a single rx connector, and was still able to draw a 7.5 amp spike, with consistant 6 amp under load

I then did the test suggested by the fine sir Santiago, and got a voltage drop at the tail servo of 1.1 volts.

The pack voltage this morning is a resting 7.7 and under a 3 amp discharge load, started at 7.5v RX pack is a 200 flight old outrage 2200mah 2s, that im cycling now.
EDIT.....run the pack down to 6.3volts yeilding 1780 mah....from a standing voltage of 7.5 volts.....theres nothing at all wrong with that pack!

I have gone through a few of these, so i could be a duff pack.

I changed the frequency on the unit to drive the tail servo at 400hz...its a bit of an oddball number.

Ill retest the chopper today with a new 5000 mah rx pa k, and see how it goes.
The copterx fbl unit was 29.95.........It has performed very well on 450 size so far for me. It flies exellently infact, thats why i thought id see how far we could push it.

The fine line between cutting edge, and bleeding edge

Thanks again for your imput guys.

Assumption is the mother of all F#@&ups.....