Throttle glitches

[Mercuriell]

I have a 2 month old 9CHS Super with AA NiMh batter y pack - last weekend the throttle on the Evo 50 spooled up by itself to about 15% which scared the sh1t out of me and a mate - I stalled the thing by kicking it in the tail rotor (ouch). I put it down to an interference glitch but last night it did the same with my TREX600 at a different site with a different Rx - just spooled up to about 10-15% and then control returned.

The idle and throttle hold switches weren't flicked = the only other thing I have noted is that the Tx beeps every few mins or so and I once caught the PCM logo top right of the display highlighted while it was beeping. Sounds like a Tx fault to me - anyone with anything similar ?

Could it be the Tx slipping into F/S Rx programming mode ?

[flyinfool]

Where is your throttle failsafe set?
The electric should be set for off and the engine powered ship should be set for either off or idle, your choice.

[MarkD]

The flashing PCM logo is normal. It does it every minute to signify it's sending the fail safe signal to the Rx - it's in the Futaba FAQ

As to why the throttle channel went to 15% :dontknow

[Mercuriell]

F/S set to about the setting it kicked into - makes me wonder if it wasn't a momentary power out - might take a look at the battery pack.

[DavidH]

Yes it could be that the power is monetarily going out. Doesn't sound like it is going into battery failsafe condition. You have to cycle the throttle stick to low throttle and then back up when it goes in Battery F/S.
I would check the battery pack closely for loose connections. The tabs on the cells will sometimes come loose and not have a good connection. Then when a load is applied it will cut out.

David

[Mercuriell]

I was thinking of Tx signal lost F/S rather than battery low F/S in which case it would default to low stick throttle - on that topic I've decided that the cyclic - collective - tail trims shoud be left 'normal' ie their last position as testing the signal lost failsafew on the ground last week caused a sudden change of trim resulting in a low speed boom strike.

Thanks for your help

[DavidH]

You test the failsafe settings when the engine is not running. You can test them on the bench. Just turn off the transmitter and Failsafe and Hold will do there job.

I would never test Failsafe or Hold settings while the engine was running or the main rotor is turning.


David