HC3sx/DX9 tx settings ?

[woodsta888]

A member has PM'd me asking how to set up the preset failsafe with self level and referred to it as a safe mod.


Kev, I've changed the start of the second paragraph as it's the receiver that holds the failsafe and not the BD3SX unit. Didn't proof read sorry.

I was referring to a failsafe. So that if the heli suffers a brown out (loss of signal) and thus loss of pilot control. This may occur due to a flat Tx battery, flat RX battery, frame drops or losses, a BEC failing thus loss of powwer to the RX etc. All model should have failsafe set in this event. Usually it's a cut of the throttle so the model doesnt fly off and whack someone in the chops or disappear out to sea.

With Spektrum preset failsafe as well as selecting throttle hold you can also initialise self level self level and a selected blade pitch of around negative 3 degrees so that in the event of signal loss the heli will level and hopefully somewhat semi auto down. Depending on the receiver you have and I'm talking from a spektrum point. You need to rebind the tx to the rx and you want to use the preset failsafe option in the manual. Follow the 5 steps to set preset failsafe and at step 4 have the throttle hold on, the self level activated and the collective at around negative 3 degrees. Let it rebind. Preset failsafe is set. Test before flight by turning on heli and tx, and make sure the balde pitch drops to where you set it, the green light comes on on the BD unit and in the channel monitor check thethrottle goes to low throttle.

Now if you have a signal loss your heli will self level, cut throttle, and put the collective at negative 3 degrees. This should semi auto down. Whilst it may suffer a heavy landing at worst you'll suffer a tail strike if you come down on flat ground. Some folk walk away with no damage at all. Depends on height it happens at, size of model and blade inertia for a successful failsafe auto.It just ensures the heli comes down skids first. I was referring to the AR8000 by spektrum here but many others have the ability to set a preset failsafe..

***Be aware that if you have your rescue set to the bind button. You will need to unbind this before you set the preset failsafe. And once you are happy the failsafe works - re assign the rescue to the bind button.

Good luck and hope you don't need it. I'll post this in the thread.

[Jez N]

OK

SO i now have the HC3sX set up as a FBL unit with the swash and tail all moving in the correct directions and i am confident that it would currently fly and work as a FBL unit.

Questions

1/ How do i set up IU1 and IU2 so that they have different gains and parameters? Is it possible?

2/ HOw do i set up the left and right trim buttons to adjust the gain? How do i know that that is working before i fly? Tried moving them in the software and no sliders move.

3/ Have loads of questions about the horizon mode, but will save those for once i have the model flying as i want it as a FBL unit. Walk then run etc!

[woodsta888]

Hi Jez,

Answer to question 1. - Probably best to look in the extensive setup guides on helifreak (which seems to be down at the moment) as I cant answer that one. Something to do with mixing channels to IU1 and 2 maybe. Not sure. Beyond me and my abilities especially as a pilot.

2, You'll need to look at the monitor display on the tx and watch the numbers change as you adjust the gains. They wont change in teh software. What you do is set the gain solid in the software. So what they suggest for tail gain is fly starting at 55%, increase the gain until you wag, come back say 5% and note the value in the TX when you land.. THEN in the BD sofware set this as your value in the software to write to the unit. On the DX8 I use the gyro channel to set 3 different gains and switch in flight on that.

Same idea for headgain. Fly until ossilation, drop it back until stable, note value on landing. Connect up BD at home or laptop on site and input that value into the software and write to the unit. Then usually you unbind the headgain channel and forget.

3, I flew mine first and then came back to the horizon modes. Essentailly it just works once you have the correct values set in the channel you are operating SL & rescue from. Adjusting the values in the tx can speed up/slow down how quickly the self level operates. And for the rescue you can adjust inthe software climbout speed, rescue to skids down where it will flip the heli right way up before climbing out. Or the other option it will level and climbout inverted if that is the closest oreintation at the moment you hit rescue. I think there are a couple of parameters just to adjust how fast in the software. Do look on helifreak for the guides as there are many for different tx's



Before you fly. Make sure orange light is on, swash is level. And Dont forget that on some helis the swash moves down for positive pitch. After a re set up I did I forgot this and it was a short course in down is up and up is down. That woke me up! Kept my cool and didnt hit rescue as dunno what would have happened. Don't think there were any more Fuster Clucks I made.....not that you'll make them.

There are quite a few pre written setups you can look at for different sized helis available. BUt going through it yourself is the best way to get to know the software.

[Jez N]

2, You'll need to look at the monitor display on the tx and watch the numbers change as you adjust the gains. They wont change in teh software. What you do is set the gain solid in the software. So what they suggest for tail gain is fly starting at 55%, increase the gain until you wag, come back say 5% and note the value in the TX when you land.. THEN in the BD sofware set this as your value in the software to write to the unit. On the DX8 I use the gyro channel to set 3 different gains and switch in flight on that.

Yes, i have it set up on the Tx, but not in the software. Have manged to get it now so that the software head gain is controlled by a trim switch so this can be changes in flight. Now want to set up the tail gain similarly.

Still cant work out if you can have different agilities etc for different IU modes, or even how to change IU modes.

At present, when i flick the gear and or horizon/bailout switches the light goes orange.

In the Tx, the IU switch is also controlled by the bailout switch. So there is mixing going on that i dont want lol

Will have to wait for HF to come back online, or find someone local who can give me a hand.