zyx software. my pitch direction changed

[neverland]

a very weird and scary thing happened while testing my mini titan today, which im converting to zyx fbl

i hovered it yesterday for the first time since fittting the zyx, and all was fine, apart from cyclic response which was very sluggish. so today i changed to the 'extreme' button setting in the tarot software.

this time it wouldnt take off with a normal amount of throttle. i thought this is weird so i lowered the stick. but then the heli shot up in the air about 15 feet. motor wasn't turning, so it sort of did an auto back to the ground. a very heavy landing but luckily on the skids

i looked at the software and what had happened is the slider that controls the overall swash / pitch direction had changed by itself from the negative 70 value (where id put it) to a positive 70 value. so i had a weird combo of negative pitch with increasing throttle, (explaining why it wouldnt lift off normally), and positive pitch on lowering the stick, propelling the heli up in the air with the blade momentum alone

luckily there was no damage. i dont know what went wrong but it appears to have only altered the swash direction / pitch setting and no other software settings. i'm going to check on my settings alot more carefully if i ever click on those 5 buttons again

[super bad]

Post a picture of the blade grips and blades I bet the blade grips are on backwards

[neverland]

no, it couldn't be as the maiden flight was fine, as described. it was definitely the tarot software that glitched. i had moved the pitch setting slider down, but it changed back by itself (and thats after the program had been saved, opened and closed successfully several times).

ive had settings ive altered not 'stick' on saving the zyx software plenty of times, but not change once saved and opened successfully on both computer and zyx.

it was clicking the extreme button that did it. another thing i dont like is the button you selected (ie hard core or extreme) is never still red when you reopen the software

[Dr. M]

Clicking one of the preset buttons applies a set of settings to the ZYX. It's possible this also altered the collective direction, though it shouldn't.

Most importantly, though, you should always do a preflight check of gyro comp and stick inputs, particularly after changing settings.

[Daddy]

Switching directions does happen, see this post . This can be consistently duplicated.

As the doc says, alway preflight. Also pay attention when adjusting in software as things can accidentally get changed and make sure you have good saved ini's.

[polysheep]

Totally agree with the preflight check. i just converted my 450 with zyx-s two days ago. on preflight check i realised the cyclics were reversed, even tho on pc setup it shows me having the correct stick directions set up. this was on john's app v1.22

would have crashed immediately if i skipped the preflight check.

[neverland]

thanks for confirming guys. yes its quite dangerous and definitely pays to do a pre flight check, esp when you've just changed settings. i will be alot more careful in future. luckily for me it was just the overall swash movement that got altered, not elevator or aileron movement so it just went straight up and down again rather than tipping sideways (its amazing how far it goes even when the motors off lol). trouble with the mini titan is the swash movement is opposite to 450s, which im used to, (MT swash goes down, not up, to give positive pitch) so i did not automatically spot something was amiss from just looking at it spin up.

[Daddy]

Check your manual and MT forums...I think the MT has leading edge control which should cause positive pitch when the swash moves up. Flipped blade grips cause this change to happen.

Both leading and trailing edge control work but generally leading edge control is preferred (there's dissertations on this!)

Gotta luv these little heli's

Oh, anf have fun flying

[Crashtestheli]

I had the exact same thing happen on saturday.
on mine just the pitch changed from neg to positve.
I will now check the rest on my setting!

[neverland]

Originally Posted by Daddy

Check your manual and MT forums...I think the MT has leading edge control which should cause positive pitch when the swash moves up. Flipped blade grips cause this change to happen.

Both leading and trailing edge control work but generally leading edge control is preferred (there's dissertations on this!)

Gotta luv these little heli's

Oh, anf have fun flying

hi. just so nobody makes a set-up mistake, the mini titan (V1, at least) swash moves DOWN when you raise the throttle stick. its totally counter intuitive, but there you go. there was nothing wrong with my mechanical set-up, it was entirely a software glitch, as i described. i have flown the heli since altering the setting and its great..keep an eye on those zyx settings

[Mikej]

Originally Posted by neverland

hi. just so nobody makes a set-up mistake, the mini titan (V1, at least) swash moves DOWN when you raise the throttle stick. its totally counter intuitive, but there you go. there was nothing wrong with my mechanical set-up, it was entirely a software glitch, as i described. i have flown the heli since altering the setting and its great..keep an eye on those zyx settings

Yeah - I had one a few years back, it just looks wrong till you get used to it

DIdn't get around to FBL-ing it before I killed it unfortunately

[Daddy]

Originally Posted by neverland

hi. just so nobody makes a set-up mistake, the mini titan (V1, at least) swash moves DOWN when you raise the throttle stick. its totally counter intuitive, but there you go. there was nothing wrong with my mechanical set-up, it was entirely a software glitch, as i described. i have flown the heli since altering the setting and its great..keep an eye on those zyx settings

Mind putting a pic of the head your using? I know it moves down on the flybar head but with a flybarless head it should move up unless washout arms are still used.

And no intention to confuse anyone, my apologies. Learning is sometimes hard for me in my old age

However, you can change it and many do and prefer leading edge control regardless of the rc heli. Albeit theres been many a debate about about this on the forums.

[neverland]

oh right. i can see where your coming from. camera needs new batteries sorry. i have modified the standard fb head, so the main links up from the swashplate don't connect directly as most fbl heads do, but connect to an inbetween arm, which itself has a link up to the blade holder. its a common conversion.

by leading edge control do you mean the secondary link attaches to the leading side of the bladeholder? because they do. its the same as on my 450 fbl.

[Daddy]

Originally Posted by neverland

... so the main links up from the swashplate don't connect directly as most fbl heads do, but connect to an inbetween arm, which itself has a link up to the blade holder. its a common conversion.

by leading edge control do you mean the secondary link attaches to the leading side of the bladeholder? .

Ah, gotcha. No need to do the pic. That arm is the washout and what reverses the swash (besides LE or TE control).

LE control is where the blade grip arm/ball joint is on the leading edge side of the blade.

TE control is where the blade grip arm/ball joint is on the trailing edge side of the blade.

[neverland]

ok. id rather not have to extra bits in between but i suppose it might help cushion the servos in a crash. and its a free conversion