piro crash due to tail servo connector fault ?

[xircom]

twice now during flight (one time after 4, other time after 2 tanks), the heli started piro, even in hover, first time I could catch it because 2m over ground (blade cut grass) today it "fell off the sky" ! This also was kind of announced with short tail wagging in ff flight. The battery is not an issue, just put back 400mAh out of 900, also cables and connectors all ok.

Just one connector (name is Berg ?) from servo to gyro (male, servo side) is bit hard to connect, now a very close look to the servo connector (of JR810G) I can see, the "hinges" (which press on the female side) are no square anymore, brown and orange are about 24% "open", whereas red is worse, one side completely straight up (90deg so to say), the other side a bit bent.

It's hard to say, if this is enough reason to let the heli spin suddenly - but if someone has experience with this, or any suggestion to test what can be done, please let me know - I am deadly scared right now to fly again !!! :dontknow :dontknow :dontknow

Thanks so much ....

PS atually don't know how this happen, that they don't look "square" anymore, maybe putting once wrong side, or from putting in/out quite many times ...

[Jafa]

Nasty stuff - fully understand your nervousness, you have have a heli you trust!

If it is the connector (I cannot tell from photo - you need to use camera macro mode)
then you should be able to reproduce the problem on the ground
by wiggling the wires and connectors

The only other thing I can think of is a dry solder joint in the RX
on the Rudder channel - I'm aware of this happening to others
and have exactly the same symptoms
Radio repair people can diagnose this in the workshop
if the joint is dry or damaged enough to reveal the problem

I would be tempted to buy a new GY401 and S9254 Servo

The battery is not an issue, just put back 400mAh out of 900
I think you mean out of 1900

[xircom]

Hi, thanks for quick reply - yes I mean 1900, damn it just makes me nervous. I tried the macro mode, but still it's somewhat very tiny to see even by eye. Anyway, the red one (+ I guess) could well glitch, because it's just not pushed down this way, I really hope to have found the problem now ... can hardly tolerate my own mistakes, but not that of equipment - this is why I normally buy nice brands in RC.

I think I'll bring the servo to the shop, they might send it to JR and ask what they can do. Actually strange enough, that this 810G servo "sport" somewhat has silver connectors rather than gold, they look actually not as strong, even they can repair it, probably I'd use the set (500T, 810G) in one of my older JR electrics.

Talking about new gyros, yes I thought about it. Actually you can buy that stuff quite cheap here (compared to other things), so I have

- 401 and 9254 17000Y (143$)
- 502 and 9245 21500Y (181$)
- G7000TSX and ds8900G 29000Y (244$)
- GY611 and S9256 35600Y (299$)

I fly 401/9254 with my lepton, this is good and small weight. For 50 size helis people say 502 is the right choice, just the difference between 502 and 401 seems to be close to nothing when flying, but it has some display for example to read-out the voltage (backup to my voltspy), nice display etc, this is normally not needed, but for less than 40$ difference ?!

Then 7000T and 611, I think this is too much for me, just training loops and rolls (yet)... even electronics are cheaper here, it's still almost double.

What do you think ?!

Thanks again !!!

[Jafa]

Yes, fully agree, 502 is not much difference in flight to 401
and I don't like trying to find somewhere for the Amp/Controller/Display
401 will take you a long way - and you don't worry about crash costs

Don't need 601/611 etc until doing advanced piro moves

[xircom]

uhhm, is there even any difference ? I read it's same chip, on the other hand I also read also - compared to 401 (30-60 class), the 502 is for "more advanced aerobatics" through better centering, faster and more constant piro rate and rather for 50 or 60 3D size (which I have) ... oh if this is true, then would be willing to spend those 40 and shuffle some space ... but also what could be important to be separate adjusted ?

Just somehow try to find out is there is really something useful - the voltmeter is for me, but as you say I like to set it, and forget it's there.

[xircom]

oh and coming back to the connector, it actually looks pretty much like the one in the picture - if it's new, but in my case, just imagine those two silver straight plates in the bottom (supposed to press the incoming male connection pin down) not as square and closed, but bent upwards, so that the hole is wider open (I tried to paint below into picture front view) and an incoming pin would probably not being hold tight and maybe loose connection, at least temporary. This is really difficult to explain :arggg:

Would you judge this is pretty much possible or would I better seek also for other issues. If it would loose connection temporary, it felt pretty much like first time, where after 2-3 quick 90deg turns, I could hold the heli again, but last time ... not. :arggg:

BTW, just checked all female 3pole connectors on my helis, RX batteries etc they all seem normal like in the picture, just this 810G tail servo, I have no idea why just this one. :arggg:

[Jafa]

The 502 is a 601 dumbed down - it can be converted to 601
But as standard the 502 is much the same performance as 401,
maybe better piro in windy conditions

Well, put the electrics back together on the workbench and turn them on,
wiggle the connectors and watch what happens
if nothing bad happens then keep looking for the problem

[xircom]

indeed nothing happens, no matter how hard I push, wiggle and re-connect it, it always seems to hold well, now this is even more scary than a failure .... keep on looking for the problem, if you or anyone has an idea, please tell me ... :dontknow wiggled also switch, gyro cable at gyro, receiver ...

In the picture (made just after came home) the gyro/servo and gyro/gain (using 20cm extension cable for gyro/gain to receiver). Use straps to prevent connector coming out.
Voltspy plugged into AUX5.
tail servo not at limit, does not sounds when full turn, should not be problem
rods very solid still, no screw or anyting missing at tail

...?

[xircom]

Some other data :

- RUDD D/R 80% EXP 35%
- Travel Adjust 140% both directions
- Gyro sens (490T) 88% / 10%
- No other mix whatsoever

also heli was only about 30m away from me, not more in a normal hover. Before that flew fast forward in all directions, no problem, just slight tail wag sometimes.

I am lost ...