KST215 / Tgy306 servos - DANGEROUS

[joe_uk]

These kept failing on me, here's why!

www.helifreak.com/showthread.php?t=836785

Posted on HF because it's a larger community and I consider these servos dangerous.

[Paz26181]

I've had the 306s on my g380 since the heli was first released, I'm still running the same set of servos after many crashes and not change a thing apart from servo arms.

Sorry to hear about the problems you been having, Could this be a bad batch?

I do recall a few years back someone on HF mention the board didn't have much space and a small mod was required.

It's a shame really, they are good servos. Is it the kst or tgy you had the problem with?

[bigpops]

I had the Turnigy ones in my X3 and Warp 360 for years, never a problem. I did line the case bottoms with insulation tape, just in case of shorts.

I think I had my X3 for 3 years plus, and I fried all the servos in my Warp by hooking up the BEC to 12S instead of 6.

[acidla]

With the TGY 306 servos all around on my Oxy3 i broke the 1000 flights barrier without any issue.

[Mike Sanders]

I have had a lot of TGY 306 servos. I haven't had any problems with them except unscheduled landings.

[nkma]

I have four TGY 306G (USD 20-22 each) as tail servo on 450 pro and 450L. After some 1500 flights or more with these helis and quite a few crasches the tail servos are still going strong. Everything, including gear, is original. I also have a 450L with a MKS DS95i (for some USD 100). I can't tell the difference between these when I fly.
Unfortunately TGY 306G seem hard to find now. Othervise I would recommend it for any heli with up to 360 blades, perhaps even 380 blades. I haven't tried them on any 380.

I bought my 306's quite some time ago. Probably 18 month or more. Perhaps quality has gone down since?

/Bo

[acidla]

Still no fail after 1500 flights? I just replaced mine after 1230 flights.
Slop developed in the gears and now i installed KST’s.

[nkma]

Still no fail after 1500 flights? I just replaced mine after 1230 flights.
Slop developed in the gears and now i installed KST’s.

Sorry for being unclear. My estimated 1500 flights was on the helis with TGY-306 together, so average some 375 flights per servo.
I checked for slop now and it was hardly noticable (less than 1/10th of a mm at the ball).
I had a fifth TGY-306 on a heli that haven't flied yet. It may have more slop than the others... I'm guessing 2/10th.
I'm not sure, but if that is the case, it could be an indication of that more recently manufactured servos are less good...

/Bo

[acidla]

No worries mate

Ok mine have had so many flights which have over paid their value.

In my history i have had a brand new align servo for the trex 500 fail on the bench while i was centering the servo horn.
The other was a Logitech tail servo which had around 40 flights.

[Gixxer]

These kept failing on me, here's why!

www.helifreak.com/showthread.php?t=836785

Posted on HF because it's a larger community and I consider these servos dangerous.

I just read the thread on HF... Somewhat hyperbolic, dontchathink!

If you're using the kst ds215 or the turnigy tgy306 servos you need to read this and stop flying at once.

I've been using TGY306 servos since day one, and I've never had a single servo fail in the way you suggest. Do you, perchance, work for a rival servo manufacturer?

Seriously, though, I have these servos on all of my 450s, and the only time they ever failed was due to an inconsistency between perceived and actual pilot ability.

[joe_uk]

No I don't. I had 2 fail within a month. Dodgy batch?

[bigpops]

It's perfectly possible.

Align had dodgy BL815H servos doing the rounds at some point in 2015, most of them seemed to end up in America. It happens.

[nkma]

TGY306 on Tail or on Swash?

I just realized that I have only used TGY306 on tail. Perhaps the failures that some have experienced have happened with the servo on swash?

I never had any TGY306 failures so far after many (thousends) flights. Moving around a swash takes quite a bit more force than changing tail pitch. Recommendations for swash and tail servos from heli makers often specify 2-3 times the strength for a swash servo than for a tail servo.

We (at least I) tend to look mostly at speed and strength when looking at servos. Perhaps some servos are built in a way so that they just work better as either tail or swash servos?

In the case of the TGY306 and KST225 I understand that it is the connection between motor and PC board that can break under heavy load. This thread may IMHO be a reminder that there are information that often is not showed in servo ads, e.g.:
– Suitable for swash or tail.
– Tendency to develop slop after some use.
– DC current use.
– Recommended max frequency.
– Resolution.

/Bo

[Mikej]

Since the original post in this thread I have had over 200 flights with these potentially lethal servos - no fatalities, no injuries, however I have to admit to needing to replace the gears in one of my TGY306's due to an arse-from-elbow problem... other than that they are working perfectly still

[Gixxer]

I just realized that I have only used TGY306 on tail. Perhaps the failures that some have experienced have happened with the servo on swash?

All of my 450s have had them on swash for years. Never had a single issue.

Seems I was recommending them back in 2013 after about 18 months of flying them. I tend not to recommend anything unless it's very good.
http://www.rcheliaddict.co.uk/t-rex-...vo-advice.html