AR7100/R warning

[Tom Burgess]

Was out last week flying my Aurora. Had a couple of flights and landed. It was going to be the last flight of the day and I always clip off the fuel line to let it cut of fuel starvation on the last flight.

Anyhow I walked over to the model and got about 6ft away when the heli started spooling up. I didnt ask it to do it

I waggled the cyclic as I couldnt get it to slow down, nothing happened, I had no control whatsoever. luckily i regained authority and clipped the fuel quick.

Went back to the pits and checked everything over. Everything looked fine. Turned tx on and then rx and waggled stick to see if I had control. The swash started to move than stopped, then started again. had the low voltage flahing light on the rx. After a lot of ****ing about I found that the "fail-safe" switch was dodgy. Fair enough if a cable to the switch gets cut you wont lose power but something has abviously shorted in the switch and caused it to think the heli was turned off!!

The reason it spooled up must of been that I had a higher trim set for the failsafe on throttle and it had briefly gone into that then lost power.

I no longer use a switch and just plug the battery directly into the rx now.

close call that could of ended in disaster, "fail-safe" doesnt mean you are always safe

[Britflyer]

Thanks for the warning, I never liked the look of that switch, so I never used it.

I just have a servo extension lead plugged into the switch port and then use a bind plug as my switch, pull the bind plug out to turn on and vice versa. Saves plugging the main battery in each time.

Not my idea that one, copied it off Edders!

Cheers

Paul

[Tom Burgess]

Yeah I recall getting a servo lead switch thing with it so I may look into that, cheers

Thanks for the warning, I never liked the look of that switch, so I never used it.

I just have a servo extension lead plugged into the switch port and then use a bind plug as my switch, pull the bind plug out to turn on and vice versa. Saves plugging the main battery in each time.

Not my idea that one, copied it off Edders!

Cheers

Paul

[0h5h1t]

No criticism intended but a valueble note to always check your fail safe settings after completing setup of the throttle too.

glad it ended well though, could've been worse.

[Tom Burgess]

No criticism intended but a valueble note to always check your fail safe settings after completing setup of the throttle too.

glad it ended well though, could've been worse.

yes you are spot on with that comment. i recall moving the throttle arm on the barrel so that will be the cause of that

[trillian]

Yep. So far I have not had any Spektrum failures but just checked the failsafe setting on one of my helis before flying this weekend and it scared the bajesus outta me seeing where it was set, so I re-binded and set it properly.

No criticism intended but a valueble note to always check your fail safe settings after completing setup of the throttle too.

glad it ended well though, could've been worse.

[moyesboy]

Rebind you heli with cyclic mid stick, t hold, and zero degrees collective.

The reason for this is when the rx comes on and looking for a tx it puts all the controls to the bound positions and puts no output to the throttle.
Better to have this at zero pitch because then if you ever switch your rx on with no tx on, and the blades in the tidy, you will not stall your cyclic servos.

When the rx had a tx bound and lost it, it goes to failsafe, hold on everything and the bound throttle position (tickover or stop).

The reason to be sure you bound with zero collective is it can happen that intermittent rx power can put the channels to the bound position momentarily which may well be max negative collective (left stick down). Folks have had a dodgy power to rx due to vibration, and on lift off had it go full negative slam into the deck.
...though perhaps that is safer than having it float about out of control for a bit with the throttle freewheeling?

[robgt]

Not my idea that one, copied it off Edders!

Woohoo, he's useful afterall
LOL
Cheers,
Rob

[kevinh]

Rebind you heli with cyclic mid stick, t hold, and zero degrees collective.

The reason for this is when the rx comes on and looking for a tx it puts all the controls to the bound positions and puts no output to the throttle.
Better to have this at zero pitch because then if you ever switch your rx on with no tx on, and the blades in the tidy, you will not stall your cyclic servos.

When the rx had a tx bound and lost it, it goes to failsafe, hold on everything and the bound throttle position (tickover or stop).

The reason to be sure you bound with zero collective is it can happen that intermittent rx power can put the channels to the bound position momentarily which may well be max negative collective (left stick down). Folks have had a dodgy power to rx due to vibration, and on lift off had it go full negative slam into the deck.
...though perhaps that is safer than having it float about out of control for a bit with the throttle freewheeling?

today was a classic example of negative pitch on fail safe dropped like a bloody stone mate lucky for me only 6 foot

[moyesboy]

When the battery lead was loose on my knight it lost power momentarily to the Rx while in an inverted hover, and due to it being bound at zero pitch it came down gently (cost a boom and one blade).