Random loss of control

[ledtoe]

Was flying my 450 earlier and was about 4 mins in to the flight... nice steady hover... lost all control from the tx. it was sat at about head hight hovering by itself... motor was stuck at the same rpm and no servo control.

Even tho it wasnt doing anything i droped the stick right down and the heli sat there hovering for about 3 secs then went down like a brick... no damage tho landed on its skids

Everything was ice cold, the rx light wasnt flashing....

anyone know what could cause that?

tx is a dx6i the rx is a 6110. esc is a cheap blackmantis 60a. lipo is a loong max 2300 thats been puffed up for 3 months ish.... would that do it?

[horsham rc]

battery power in the tx maybe? was it below 5.0v on the bar on the lcd display? only i had a similer epesode and it was the batts in the tranny

[ledtoe]

Could of been that i suppose... was on 5v when i started. would the rx light start flashing if it was that?

[horsham rc]

if the rx light was flashing it means its not bind correctly..normaly voltage.

[trillian]

Could of been that i suppose... was on 5v when i started. would the rx light start flashing if it was that?

The rx light will start flashing anytime there is a break in the signal, either from the TX or power loss to the RX.

[ledtoe]

Yeah thats what i thought... the light wasnt flashing tho.

[GravityKills]

actually both theories about the flashing light are wrong, if Spektrum. In a nutshell, it would mean the Rx had a power failure. Google for it.

Possible reason: check satellite wires for damage, happened to me.
I've had my share of weird radio glitches myself, unfortunately. It happens...

[Gareth-71]

Hi

I have had a similar thing last year. Inv hover of the trex600 and then total loss of control but everything stayed the same on the heli. I did not get control back, the heli just slid away to the side and crashed. I never found out what it was, and have never had a problem since. I guess these things can just happen sometimes

How long have you been using your esc?
Have you done a range check?

Gareth

[PeteStewardson]

On a spektrum RX the red led will flash the number of times a hold happened during a flight. A hold is the TX losing connection. If there was no flashing red led then it must have been power to the RX. I'd be suspect of the ESC to RX power.

[cjcj1949]

It's not an old DX6i that hasn't had the mods done? I don't see how the motor kept going. Failsafe should have shut that down. The Rx must have been ok to keep the motor going, unless the esc can keep the motor running on its own. Was the heli keeping a constant height for 3s? You then regained control after 3 seconds and landed it. Did you have failsafe set up to keep the motor running? It takes about 3 secs for the tx to get going again and find two channels and for the rx to find them. Loose battery connection or dirty contacts? TRy shaking the Tx.

Chris

[ledtoe]

I'll try changing the esc then...its looking like the problem. its not that old but it is a cheap one.


Thanks for the help!

[coolice]

Hey.

Sounds like you had a receiver brownout due to the BEC supply voltage to the receiver dropping to a low voltage.
Te throttle staying high is worrying but can be a problem brought about by an incorrectly set failsafe or a cheap ESC that doesn't kill the power on a receiver signal lose.
.

[pchristy]

You *did* have the fail-safe set, didn't you?

[ledtoe]

Yeah fail safe was set to low stick

[horsham rc]

[quote=ledtoe;613605]Yeah fail safe was set to low stick ?
is the fail safe unit for helis the same as for an rc car?
or is it built in to the tx rx system some how?