450 Trex 450 Pro 3GX V2 Gone MAD!!

[Graham Lawrie]

Trex 450 Pro 3GX V2 - YouTube


This is a weird one The Youtube link is saying 1 hour to download

The story so far: After being in its box while i built my 600 and the weather being pants!!, i fired up my 450 this weekend and it appeares to have lost its settings

I went through the whole 3GX set up and everything seemed fine. In between the showers i took her out and spooled up. In the video(which is poor), you can see she is trying to pull into the ground. She starts to hop when i am above mid stick and bring it down to mid stick?

Throttle and pitch curves are linear.
All stick movements are correct.
Tail is moving correct.
I have had the blades off and spooled up and the swash acts correctly all the way up and down. At full throttle she just wants to hug the ground as if set for inverted? Mid stick you can see she nearly moves, above mid stick just power and no lift?

On my DX6i i have viewed the monitor and all the arrows are moving correctly?

This has me stumped??

The only other thing is above mid stick i hit throttle hold and she shot 8 feet in the air, luckily the big yellow balls made for a soft landing

Any help/suggestions, as always much appreciated

At time of posting still 47 minutes for video to upload to Youtube????

 

[coolgabsi]

yeah youtube uploads take a while.. Well I am vry curious to see what this looks like. on the bench, all blades, off, have you spooled up and do you see similar swash behaviour?

are your pitches correct.. 0degree mid and positive and negative 11 or 12 or whatever. ?

If it does it on the bench too, then I would tell you to isolate the 3GX from the frame and try again..

but I am jumping ahead.. waiting for your video .

 

[Graham Lawrie]

Hi Gaba, I have had the blades off spooled up and not seen any abnormal movement in the swash. Pitch 10/0/10??

- - - Updated - - -

12 minutes for the video .......ZZZZZZZzzzzzzzzzzzzzzz

 

[Lee]

If the swash is moving smoothly up and down but the heli is jumping at midstick, maybe the feather shaft is bent causing a sudden change in pitch at that point??? Just a guess, lets see if the video helps.

 

[Graham Lawrie]

Video now uploaded

- - - Updated - - -

If the swash is moving smoothly up and down but the heli is jumping at midstick, maybe the feather shaft is bent causing a sudden change in pitch at that point??? Just a guess, lets see if the video helps.

Brand new feather shaft after the blades popped

 

[Lee]

Ok watched the video, but it still doesn't help. What we need is a close up of the swash with blades off to see what its doing when you give throttle. Try rebinding like i said in your PM. See if that works.

 

[Graham Lawrie]

Hi Lee, Re bind the TX to RX? I did a video of the same thing on the table without the blades, but after that epic upload another time maybe. I am thinking there is a short on a wire or something like that?

 

[Lee]

Check were wires go through the frame for cuts. Carbon is a bugger for cutting through wires.

 

[coolgabsi]

I think I know what it is ... I think


When you go down on throttle the heli wants to lift but your swash is still going the right way...?

Right?

And going up on throttle pushes the heli down....

But your swash is moving up with stick advance up and down with stock low..

Means your blades / blade grips are connected backwards to the swash. Rather than being trailing edge control they are now leading edge control (or vice versa.. Whatever align head is .. Look in pics) and compare it to yours


Edit:


Just checked that align heads are leading edge control. Means the head linkage is connected to the grip in front of the blades ... (Leading edge)
If yours is backwards, that is your issue ...


Fly safe!! have fun!

 

[Lee]

You could be onto something there Gaba.

 

[cn63bug]

+1 to Gaba
I had a very similar situation. In your video, your heli is doing the same thing mine did when I first got it, except I didn't have training gear on it to keep it from tipping over. The blades grips were reversed to where it was pushing and pulling by the trailing edge instead of the leading edge. Not enough positive pitch to lift it, but will make it hop and tip.

 

[Graham Lawrie]

I think I know what it is ... I think


When you go down on throttle the heli wants to lift but your swash is still going the right way...?

Right?


And going up on throttle pushes the heli down....

But your swash is moving up with stick advance up and down with stock low..

Means your blades / blade grips are connected backwards to the swash. Rather than being trailing edge control they are now leading edge control (or vice versa.. Whatever align head is .. Look in pics) and compare it to
Yours


Edit:


Just checked that align heads are leading edge control. Means the head linkage is connected to the grip in from of the blades ... (Leading edge)
If yours is backwards, that is your issue ...


Fly safe!! have fun!

DING DING DING DING

Give that man a goldfish

Oh what a ***** i am Looking for all the hard things and it was there all the time

When i changed the feathering shaft i have connected the links wrong WELL DONE GABA

Thanks everyone for your input and help

The positive thing is i have changed the plastic tail servo mount and antirotation bracket for metal ones, and tidied up some wires
Thanks
Graham

 

[Tony]

We have all done that lmao. Glad you got it fixed!