FWAL Posted September 2, 2011 Share Posted September 2, 2011 Bought 4 Zebra HZS 135 MG servo's recently all for in wing aileron use in two wings. One servo has now jammed in each wing! One after 20-30mins use and the other today after almost 2 hrs total use. I'm not sure if the first one jammed before or after an unscheduled landing but it might have been the root cause of the crash as the glider just banked to the right dipped the nose and hit the ground despite my trying to level the plane (modified advanced middle phase)Today I'd been flying for 30mins landed flew another plane than went back. Tested the controls and the RH servo just didn't seem to have much life in it. What little movement there was, was very sluggish. It wasn't long before the servo just stopped working completely and jammed solid. I don't know the cause but would not recommend these metal gear servo's. Now do I fit the two remaining servo's in one wing or just bin them? Quote Link to comment Share on other sites More sharing options...
ken anderson. Posted September 2, 2011 Share Posted September 2, 2011 hello FWAL..... sorry to hear of your prang...i've been using zebras for two years now in a multiplex blizzard with no problems at all...also in another model with the same results..... some of my club mates use them also and are happy with them.... ken anderson ne...1.... zebra dept. Quote Link to comment Share on other sites More sharing options...
FWAL Posted September 2, 2011 Author Share Posted September 2, 2011 Hi KenMaybe it was me. I have been altering the diffs/EPA's and flap mixes etc but I wouldn't have thought it would cause terminal servo failure in both wings.I'm glad to hear that your Zebra's are working well. I now think the two I have left will be put in the same wing. Fingers crossed Mark Quote Link to comment Share on other sites More sharing options...
Craig Carr Posted September 2, 2011 Share Posted September 2, 2011 FWAL.... The zebras are great servos BUT the cases are prone to coming apart easy. Its happened to one of mine and I know someone where it happened in flight.. When the case moved on mine (just a little bit not so you would immediately notice) It stopped the gears moving and so i always put some heat shrink around mine and have had no problems sinceEdited By Craig Carr on 02/09/2011 18:26:49Edited By Craig Carr on 02/09/2011 18:27:37 Quote Link to comment Share on other sites More sharing options...
PatMc Posted September 2, 2011 Share Posted September 2, 2011 I've had a pair of Zebra servos driving the spoilerons of my Easy Glider for over two years. Never given any problems so far (touch wood). They don't have the hardest of lives but probably about as much as a Middle Phase. IIRC Craig was the one who told me about the case being held together without screws but as I'd been flying the model for about a year by then I left them sealed in as they were installed. Quote Link to comment Share on other sites More sharing options...
Lee Smalley Posted September 2, 2011 Share Posted September 2, 2011 I have had a few and they have not been great centring has been poor but you get what you pay for I suppose Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted September 2, 2011 Share Posted September 2, 2011 I was going to give these a go - they are mega cheap! - but when I got to my LMS (no names for reasons that will be obvious) where they know me, the advice from the staff was "I wouldn't if I were you"! I left with some Savox to try instead. They stripped their gears so I eanded up with my usual HS82MG's. Sometimes it doesn't pay to be adventurous. BEB Quote Link to comment Share on other sites More sharing options...
FWAL Posted September 5, 2011 Author Share Posted September 5, 2011 Investigated the problem this afternoon. Scalpel, forceps....etc. I double sided selotaped the servo's onto the ply wing skin and covered with film, not expexting to be removing them for a long time! The first faulty servo was buzzing slightly but no movement. I opened the servo up and removed the gears but still no life, so the bits were put in a jar for possible spares. Carefully removed the servo from the other wing and noticed the case was ever so slightly open, jiggled with the tx whilst gently squeezing the servo and it closed up and started to work again. I added tape to the servo's to prevent a re occurrence and now we're ready to fly again. Well the Eppler wing is! Thanks for all the above advice and I'll be learning from this lesson Quote Link to comment Share on other sites More sharing options...
Paul Marsh Posted September 5, 2011 Share Posted September 5, 2011 Link in box Ugh! Nasty servos. looks like very poor build quality. I go with the LMS's comment as being true. A servo can destroy a model, or worse go into people/property and do damage. I would recommend, if any doubt, discontinue use and buy a better unit Edited By Paul Marsh on 05/09/2011 23:54:59 Quote Link to comment Share on other sites More sharing options...
Lee Smalley Posted September 6, 2011 Share Posted September 6, 2011 BEB i use savox servos with no problem, can you remember which one failed on you ?? Quote Link to comment Share on other sites More sharing options...
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