450 Woe's (Pl's help)!

[3ndurance]

"OMG, THIS IS BECOMING UNBARABLE!!!"

I'll begin by saying thanks in advance for any help I receive! I'm new to this hobby and have hit a dead end with my 450 Heli. This old girl has seen many crashes over the last 8 month but the last two are not due to my dumb thumbs proving to myself once and for all that I am improving in some respect!.

First time out this year after a long Scottish winter at my local spot on the second flight pack and the Heli becomes unresponsive mid-flight ! luck would have it I was level to the ground when this happened and at some height.
The Heli began to slowly drift forward and down as I frantically tried to effect it with spamming of the sticks to no avail then about 6 feet of the ground the motor bangs back into action briefly and then dies again at which point the model proceeds to plough into the ground!
For such a small crash the amount of damage sustained to the model was sickening! At the time my setup was as follows:

FLB unit (RX2702V-D)
3x HobbyKing HK-922MG Digital Metal Gear Servo 1.8kg/ 12g/ 0.07sec.
1x HM-V450D01-Z-15 Tail Servo (WK-2601H).
KDS Brushless ESC KDS-40A with BEC.
NTM Rotor Drive 450 Series 3400KV / 500W.
Turnigy 2200mAh 3S 25C Lipo Pack (35c burst).
Revolution 325mm FBL 3D Carbon Main Blades.
Revolution 60mm Carbon Fibre 3D Tail Rotor Blades.
FUSUNO Amazon Fiberglass Canopy.

My credit card wheezed into action and to be honest it was not a cheap repair bill but I thought what the hell and upgraded the rotor head to a bling DFC version.
When I was satisfied that I had set the model up correctly and with some help from YouTube along the way I took off for a test hover!
With +10-10 on the pitch setup I was surprised how responsive the new DFC setup was and yet so stable and smooth so I flew three 5min Flight packs back to back with no issues and came home feeling confident I could make some real progress this year with my beloved hobby!
Well today all that came to an abrupt head with the Heli stalling again in mid-air just as before only this time the motor still active but with no cylices strait into the deck motor still screaming when I walked over despite throttle hold being activated just before impact!
What’s going on here?
I have my own hunches but need a more experienced pilot to shed some light on this matter!
I would love to think that a new ESC would solve all my woes but something tells me it’s not going to be that easy…

[paulsouthport]

What TX/RX are you using?

Aerials intact? Away from carbon and at the right angle?

Was the RX flashing afterwards?

[Liam B.]

I agree with the above, seems like a range issue.
Also, where is the location of the rx/ sat?

Liam

[oddsock]

had this problem myself were my 450 heli does not respond to any input i give and just dropped out the sky luckily was only a couple of feet off the ground,did a bit of digging on it and one problem that seem to crop up is the two antennas at the tale end of the heli if they are in the bodywork of the heli(could cause a problem)so i pulled mine through the bodywork so thay hang outside and i tried my 450 tonight a couple of times and had no problems but its early days ill try it agen over weekend

not saying this is whats causing your unluck but its something to look at or try

hope you get it sorted pal

[GIXERMAN]

Not the bec in the esc playing up ?

[MarkG_R1]

What TX/RX are you using?

Aerials intact? Away from carbon and at the right angle?

Was the RX flashing afterwards?

What he said

[Hummingbird]

You may have missed some damage in a previous crash. Have you checked thoroughly all the electrics - in particular the wiring? There may be an intermittent connection somewhere. Also check the motor itself - it might have a fault. Assuming you have a carbon framed heli and 2.4 radio, make sure the antennas are away from the frames and getting a clear signal. The signal wont pass through carbon. Have you checked the servos are OK with no damage to the gears? A damaged servo can still work - sometimes! Also when you range-check the radio, do it with the heli in all orientations. You DID range check, didn't you!

What model and radio are you using? Sometimes people with the same radio might have an idea or experienced similar problems. Sorry you've had crappy luck. Any more details you can give us about the model and radio?

[3ndurance]

Hi guys ,
Well to begin with this Heli is a walkera V450 D01 which uses the WK2801pro 8ch 2.4 GHz TX.
Its been spanked that much and being T-Rex comp theirs not a lot of the original model left!
However the FBL unit and TX are some of the original parts still in use.
Two small antenna pertrude from the RX at right angles to the unit and it is mounted on a plate just above the boom mount like a
Majority of 450,models.
The RX did not show any signs of error led and when the motor came to a hualt I right sided the model and put in cyclic to see if my servo,s
Were OK and they responded with no glitch ! Its strange because if the signal had been lost the unit takes around 10 to 15 seconds to
reboot followed by a series of tones from the ESC off which I never heard and I hot footed it to the crash site strait after impact were the motor was still had power even tho throttle hold was active on my TX???

[3ndurance]

I forgot to mention the crash happened about 8meters in front of me so I have trouble suspecting range as a possibility for the crash!

[MarkG_R1]

450 Woe's (Pl's help)!

Not familiar with the tx or rx but if the tx takes regular AA batteries check the voltage of them as low voltages dramatically reduce range and then check they are tight against the terminals, then check all connections on the Heli

This sounds to me like a tx/rx issue

[scuba steve]

your a brave man 3ndurance....daring to utter the word 'Walkera' on this forum

i flew them for well over a year ( V200D01, V120D01, 4G1B etc) and thought they were brilliant to learn the basics on.....many disagreed though.

some good advice above, hope you get sorted

[oddsock]

your a brave man 3ndurance....daring to utter the word 'Walkera' on this forum

i flew them for well over a year ( V200D01, V120D01, 4G1B etc) and thought they were brilliant to learn the basics on.....many disagreed though.

some good advice above, hope you get sorted

hi' don't want to knock walkera but i gave up on helis through walkera about 3 or 4years ago i had a 4#3b or a 3#4b mico heli i think that's what it was called carnt remember now but theres was no chance of getin it up of Tera firma so much slop init it was unreal probably needed as much spent on it as it cost in the first place also bein a noob and not learning from my mistake ended up getin another walkera cp heli from ebay that i had to wait six weeks for its first and last flight ?? it was not good and very disappointing,that was me id done with the hobby , but thanks to the srb hirobo quark FP and MSR iv found myself back in the hobby,just got myself a 450 trex plus dfc rtf and its night and day compared to them walkera i had, had a couple of problems with the trex but nowt like i had with the walkera at lease it flys vgood' never manged it with the walkera models i had at the time , now it was a wile since i had them models so they may have come on over the years but they are not for me

sorry to the OP but good luck with it though,hope your luck changes for the better
atvb

[cjcj1949]

Sounds a lot like you ran out of battery. Lipos get old and lose capacity and they drop volts more when cold. You could test this by hovering close to the ground so that the heli will just land gently if the motor cuts. You could also use a battery alarm to check for this. Set to 3.5V it will give you advance warning of low volts.

[3ndurance]

I have to exclude Li-po failiure as I was only in the air for a couple of mins and checked the voltz when I got in to be certain !
I'm gonna put a 7200bx unit on it and see if I get anywere! only issue I have with that is my dx6i is the old one and dsm2 not dsmx
but according to spectrum it will work !

Any feed back on this would be appreciated . Thx

[cjcj1949]

You can't exclude the lipo like that. After flying you are measuring the open citcuit voltage. The important voltage is the on load voltage and as a lipo gets older and colder this voltage gets lower and lower. You need to measure the voltage drop on load, and you need to check what the esc does at LVC (low voltage cutoff).