HXT900, one of the most famous and the best value micro servos available. Used by tens of thousands of hobbyiests world wide. The HXT900 is the #1 trusted low cost 9g servo.
Features: • Plastic Bushing • 25cm wire • Coreless motor • Servo arms & screw included
Specs: Size : 21x12x22 mm / 0.74x0.42x0.78 in Voltage : 3v ~ 6v Weight: 9g / 0.39oz Speed : 0.12 sec/60(4.8V) Torque : 1.6kg-cm Working Temp : -30C~60C Gears: Nylon White type
WARNING Similar looking servos can be found on eBay and other asian sellers, however be warned, they do not contain Taiwan/Japan components. HexTronik (the manufacturers of these servos) have two standards, one is for local sale, and the other is export quality with imported connectors and resin gears from Taiwan and Japan. Our HXT500 and HXT900 are export only, and not built for the domestic market. You will not find the same quality servo for less, anywhere!
I'm attempting to build a setup that will allow me to control the degree of rotation of the servo using an arduino redboard, but I'm running into a problem. For other servos the setup works fine, you plug a number into the servo.write() command and the servo moves to that angle, but when I use the same setup with the HXT900 the servo moves to the angle in servo.write(), and then back to 0. It's as if servo.write() is now controlling the maximum rotation, instead of the current rotation. Does anyone have any suggestions on how to fix this problem?
These are the lowest grade of servo hobbyking sell, they are the only servo's that continuously strip gears, only use these if your desperate, try the turnigy's they are a step up from anything listed as hobbking grade.
I have never stripped them on my bix, I have used them for 5 different foam board builds of different sizes. I only every stripped one in a very bad crash.
If you are trying to fly something very fast (like a jet or something) or with huge control surfaces that will put tons of strain on them, you may strip them but unlikely. If you fly something other than a foamy and need tons of reliability, maybe go for something else. Personally I have had amazing experience with these and I love the price. Many others share my opinion. If you have had bad luck with these I am sad the hear that.
If you can recommend something better for the same cost I am all ears
Turnigy tg9's better quality same cost, choice of length of wires too. the HK brand is the lowest grade not only in servo's, planes too, the hxt's were once ok, I think they use a different manufacturer now, they've changed the gears twice that I know of, for awhile they were putting them out with black plastic gears, completely useless, they went back to white gears, I wont use them anymore, not on anything, only good for VERY light planes under 500grms, if you fly like an old granny and just do laps they may be ok for you.
I have used about 30 of these servos on the hobby king Sbach 342 EPP 3D Airplane 900mm and other smaller 3d plane half the size. some last great, some jitter bad and some strip the gears. I found the ones that don't fail are on very smaller plane. only good for small surface areas. I agree with Ral fRotten saying "changed the gears twice that I know of, for awhile they were putting them out with black plastic gears, completely useless, they went back to white gears," when I first used these thay were much better quality. shame.
One of the best and MOST HOT selling servos... These come into stock and within 3 days are again out of stock... HOT SELLING Item. The performance of this servo is extremly good and fast. Very accurate and there are no centering issues. The gears are resin/plastic and for the money totally worth it. I have been using these on my foamies for a long time now. A bit noisy but torque is good. Highly recommended. Buy them before they go OUT OF STOCK AGAIN.
20 comments. Reply..
129 thumbs up!
These gems are fast and strong, a bit noisy perhaps.
There is a downside of beeing strong and fast, they draw quite a bit of current. I measured about 550mA when exercising one HXT900 without load. This is an average, it seems to require more peak current. If used together with a linear BEC it will cause voltage drops.
I tried 2 HXT900 with a 1.5A BEC and a Spektrum AR6200 Rx. I could not exercise those two without loosing power to the Rx and cause it to a "BrownOut Reboot". With four servos connected, I could not even touch the control stick. The BEC circuit also got so hot it melted its plastic sleeve. Still works though, did not fail completely.
I tried with a larger ESC, having a 2A linear BEC, and it worked much better. But I could still force a "brownout reboot" by wildly excerise all four servos. I dare not fly my Pitts this way.
So, with four servos or more and an AR6200 Rx, I think you must use a larger switch mode BEC capable of 3A at least.
This is a combined problem of high current surge, poor power supply and voltage sensitive Rx. And maybe poor filtering of the powerline. Not really a problem with the servos as such. /A
27 comments. Reply..
84 thumbs up!
Alot of flyers in the area are just loveing these. Similar, and in some aspects superior performance to the famous HS-81 at one quarter the price.
Here's some stats from the forums here at Hobby City:
Results in degrees/sec.:
@4.8V 450 @6.0V 560 Results in sec/60degrees.:
Torque Centering 1.3 .2
3 comments. Reply..
77 thumbs up!
These HC babies kick Hitec HS-65HB's into the weeds starting with a massive 6:1 price ratio saving and ~identical physical size26.8hx23.2Lx12w mm at 9g. They use their own horn spine type however and good quality copper servo wire, and make a similar noise. My tests show very slightly higher power drain than a HiTec HS-65HB @4.8v smooth flying/hard reversals/stalls @/speed HXT900 160ma/290ma/690ma/0.14-60° (side-by-side with Hitec) HS-65HB 135ma/260ma/545ma/0.14-60° I have bought more than 30 of these and never did one give a problem with normal park flying/crashes and they work fine at 6v but be aware the current will rise to 190ma/370ma/690ma for your BEC. This servo allows you to own and operate 6 models where Hitec would limit you to one model. You decide. My recommendation is get more for less - they are basically the same spec. Sure we all have a few models that we like to run expensive servos on, but these HXT900 are the base to build a big pyramid on, and spend the money you save on buying more airplanes and helicopters. I don't consider them anything like a HS55 which = HXT500. 5 star performance for a 10 star price.
6 comments. Reply..
62 thumbs up!
These are really nice servo, and you get seven of them included shipping, for the price of one in Portugal. These servant are fast and very accurate, and the price is fantastic. Five stars.