One thing I find strange is the 9025 has 1.8kg of torque and the 9018 has 2.5kg. Most part numbers reflect specs like the 9025 you would think would mean 9.0g class size and 2.5kg torque and the 9018 being 9.0g class size and 1.8kg torque (Makes more sense to me). I think somebody mixed up some labels or something.
I bought 6 of there servoes. All of them stop to move and make noise instead when moving elevator, rudder or ailron back and forward 3-4 times. Seems like the gear teeth don't match the electronic. Maybe they can be used for camera pan/scan but nothing else.
Not worth a penny !!
For some reason I get a lot of jitters in all my servos... It's not the zyx because I separated the vibrations and separate test using separate rx.
It's not the noise jittering I'm talking about. But it is moving back and forth type of jittering.
One of the 3 servos came out of the box jammed and locked. After opening it up I found that the pot shaft is bent. Unbending it freed the gears so they could move, but it still wasn't as smooth and fast as the other two. It later died because the metal gear where the 2 pieces are press fitted came loose. What a waste of money....
I can definitely say that happens with some of my servos too. However, I'm pretty sure the jittering comes from the servo trying to center itself to much. Up in the air, the jittering should stop...I'm unsure what the level of jittering is occurring though. When it happens to me, I change the push rod length then trim the servo out* and see if it still is jittering* usually jittering for me is a little more than a vibration. If you are very concerned, you should try different servos. I hope this helps. Cheers
Hi jonacrazyplane, These servos are fine for use as throttle servos on nitro engines. They are plenty strong and very precise, so you should be happy with it. However, I wouldn't use them on the big 2-stroke ignition engines, as they would be too weak. Cheers, EA
Hi Tryin2fly, I have 8 of these on 2 different 3D planes. They feel/sound like all metal, but I haven't had to open one up yet because they've never given me any reason despite the abuse I subject them to. They're cheap, tough, precise, and center well so just buy a couple of spares if you're worried about stripping a gear. Cheers, EA
Hi Lee, The box says Mosfet controlled, but doesn't indicate that the servos are digital, so assume they're analog. That said, I've been using them in similar 3D applications to the usual Corona 12g digital servos I've used in the past and have noticed no difference in performance. They're precise, tough, center well, and dirt cheap. You can't go wrong with that combination!!! Cheers, EA
Hi Royce, These are only rated for the standard 4.8/6.0 vdc operation, so running it on a freshly charged 2S lipo (7.4 vdc nominal, 8.2 vdc actual when charged) is probably not a good idea. You're better off going with a servo rated for the higher voltage, even though they will cost more. Cheers, EA
Hi Royce, I just had a look at your options and noticed that Corona offers a high volt version of their 12g digital servos (Corona DS939HV, DS929HV, etc.) for $7. They're the same weight/size/torque as these. I've used their servs in several 3D planes and they're great. Never had one fail. Cheers, EA
I recently compared TGY-9025 and TGY-9018. The 9018 has significantly more force. In direct comparison the speed is very similar. The MG90 is not so much different compared to both. All three servos are of OK quality but not very good. Not really smooth, not very precise and not very strong but still OK. After testing 50pcnt of all HK 9g servos I come to the conclusion that you should use HXT900 (planes <1kg and <150$) whenever possible. If you need quality and reliability buy a servo from a brand
depending on the cost of your investment these servos work well with most kits. If you have big bucks in your kit pick the size and the most grams needed. I always over size. Better to have a little more. Make sure you bench test before installing. A little time running the servos should smooth out any roughness. A little time in testing will help. If theres any problem with any servo,Hobbie King has excellent cust. service and help full staff to help
Maybe so, but like with this order, I've been waiting almost a month and still waiting for delivery. I can replace gears without having to take my whole heli apart if it only requires replacing a striped gear. I have several servos sitting in my spare parts box that would be perfectly good except for 1 gear that I really hate to throw away. Seems it is always the same gear. Of course, those servos are all non-metal geared servos. I'll not be buying any more of those. Additionally, when needing to order replacement servos, they are often out of stock. You do make a very valid point, but if posible, I like to have both on hand. Thanks for the reply/comment
Bought one for testing.
exact replacement for HXT-900
- 12,4 g without horn
- almost no play in gears
- speed: faster than statet < 0,08s at 5,1 V
I am very impressed. At least on the bench absolute fine! Will buy more!
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Super serwo. Bardzo szybkie i mocne. Używam je w lotkach. Serwo mogę spokojnie polecić.
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What a great little servo. looks to be good quality, no play in the metal gears, works great in my small 3D plane. I have already ordered 4 more for another plane.