mini cp problems

[helicraze]

Hi guys, ok had a mini cp a while ago and it was perfect out of the box.

Not i got the genius and mini cp.

The genius all good, the mini cp i got from the "friday drunk" production worker.

It had jittery servo from new, main shaft collar slipped down, servo holder screw missing (servos jump around).

I replace the servo and took it for a flight, thought it was good after about 20 sec it goes crazy and hits the roof and veers off!
Tried again same stuff! It doesnt happen in a hover only when doing sharp cyclic inputs.

Now i found the collar slipped and tried the spare blades (seem better balanced) adjust tracking, tighten PCB screws. It seems to have less vibes and hovering around it seems ok.

I dont trust it 100% but what do you guys think? Can the vibes confuse the gyro and make it go cuckoo??

I will try on the weekend, hopefully its fine.

Wanted to send it back but to HK is a bit dear so i just bought the servo. Oh and to top it off one of the devo 7 tx is also faulty, elev pot shows 100% travel and does not move in output screen! Grrrr lucky i got 2 TX!

PIA

[nolhs]

I can tell vibrations can confuse gyro when I tried multiwii. We can watch the gyro outputs via an USB connection. Everything was working fine running off a heli. When I put it on my shaky ebay 450, the gyros became totally blind. All I got were meaningless flat lines from the gyros as well as the accelerometers.

We may get away with vibrations using mechanically stabilization but not electronics.

Good luck.

[mescalinedream]

I bet your servo gears are missing teeth. Open the servos up and start counting teeth. The heli will behave exactly like what you said. We have learned to do a servo saver mod since the slightest crash will eat some teeth inside the servo. Buy replacement gears if its only the one gear. If it happens to be the teeth under the horn=your screwed. You will then need a new servo since that gear is unavailable and almost impossible to fix.

The heli will act normal with some teeth missing, but when you hit that sweet spot=boom i will go in another direction. You might get away with moving the bad gear 180 degrees.

[Heli-opolis]

It's also possible the servo potentiometers, which are PoS specials, are dirty and could use some contact cleaner sprayed on them and then blown dry with compressed air.

That often helps, assuming what MescalineDream mentioned, missing teeth, isn't a factor or even if it is, missing teeth and a dirty pot.

[helicraze]

Ok it went crazy rx is faulty. Really bad luck to get devo7, 1 servo and 1 rx faulty.

Ordered barebones to replace and keep the old one for parts

[Heli-opolis]

I've read that Walkera is now fixing RX's for 'free', with you paying to cost of shipping and waiting the month or so for it to be sent, repaired and returned.

Getting a body-only bird is an excellent idea in any event but if you have one you can fly and can get the old RX repaired for only the cost of shipping, it seems like it would be a good deal all around.

I'm not sure how one goes about getting an RMA for a return though although I would guess an email sent to Walkera would provide any needed answers.

[helicraze]

I tell you what this is really bad, so i sold my mini cp advertised with all the faults for about $80 (faulty devo 7, faulty rx, i replaced 1 faulty servo from new), then the barebones i get again missing screw and stripped servo out of the box and sloppy head (the worst i have seen).

Is walkera sleeping??? 2 in a row, never had an issue for a long time now 2 in a row?

[spykez]

Originally Posted by helicraze

I tell you what this is really bad, so i sold my mini cp advertised with all the faults for about $80 (faulty devo 7, faulty rx, i replaced 1 faulty servo from new), then the barebones i get again missing screw and stripped servo out of the box and sloppy head (the worst i have seen).

Is walkera sleeping??? 2 in a row, never had an issue for a long time now 2 in a row?

I know what I do is probably a bit over the top but I order my walkera from Wow hobbies, in the States. They have so far provided me with really good service.

Example:

I recently obtained their brushless converted mini CP - it was fine out of the box, I noticed they paid particular attention to reinforcing the canopy as well, and including 2 decent sized lipos. The coil that keeps falling off - this was glued. This attention to detail - is worht the premium buying a conversion from them I think. Well pleased I was. To the point of being tempted to buy another one.

I guess they really do look at the heli before they send it out to you, that's why I don't mind paying a bit more to get stuff from them. At least that's my impression after getting 3 walkera micros from them.

Whom were you buying from, out of interest?

And, as an aside, we really should try and persuade someone down here to start distributing walkera, don't you think?

[neoneo]

Originally Posted by helicraze

Hi guys, ok had a mini cp a while ago and it was perfect out of the box.

Not i got the genius and mini cp.

The genius all good, the mini cp i got from the "friday drunk" production worker.

It had jittery servo from new, main shaft collar slipped down, servo holder screw missing (servos jump around).

I replace the servo and took it for a flight, thought it was good after about 20 sec it goes crazy and hits the roof and veers off!
Tried again same stuff! It doesnt happen in a hover only when doing sharp cyclic inputs.

Now i found the collar slipped and tried the spare blades (seem better balanced) adjust tracking, tighten PCB screws. It seems to have less vibes and hovering around it seems ok.

I dont trust it 100% but what do you guys think? Can the vibes confuse the gyro and make it go cuckoo??

I will try on the weekend, hopefully its fine.

Wanted to send it back but to HK is a bit dear so i just bought the servo. Oh and to top it off one of the devo 7 tx is also faulty, elev pot shows 100% travel and does not move in output screen! Grrrr lucky i got 2 TX!

PIA

help please. how would i know on a mini cp if the shaft collar has slipped? and how do i fix it?

[mvezz]

Originally Posted by neoneo

help please. how would i know on a mini cp if the shaft collar has slipped? and how do i fix it?

From what I know, the collar should be down against the bearing and the main gear/shaft should not have any play up or down with it like that.