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
Note: Due to customer demand we have changed back to the original white gear HXT900.
WARNING These servos can be found on eBay and other asian sellers at close to this price, 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!
Are there several versions of this servo? I had some older ones and got new ones. The only visual difference is the screw that connects the arm. The major difference is the travel range. I put one old and one new on the flaps of the BIX3 and they are severely not synced. One travels more to both sides. Even EPA adjustment could not help.
I'm aware that there was at least one different version, with black gears that were less reliable, available for a short time. Can you tell us more about the travel? Which one has the longest travel range?
I too found that the older ones I had worked great. The black geared ones didn't do as well (some stripped easily). However, it seemed when they used the white gears again they worked fine again. Here's the older version on the maiden flight of my flat foam F-22.
I bought 6 of the "new" white gear ones after they replaced the black gears none of mine survive today, I don't buy these anymore, I think the new batch's are very weak! the tg9's last longer than these so now I use the HK digital MG and normal digital, and the tg9's at least they last not like these hxt's.
I've seen your video am1sh. To me the gears are probably the same, and they have changed the value of the potentiometer inside. This can be tuned by adding resistors on the servo that has the lowest travel. But it's good to know that we cannot rely on the travel range of these things. For ailerons and flaps we should order them together so they're likely from the same batch.
Ive doubts about the 1.6kg stated. HS-55 have 500ma drain, and even srtronger HS-65HB 650ma. Anyway HXT/900 is a great servo for the price, far better than TG9. But you must be careful not overloading small ubecs (ex. 2amp ubecs is not enough for 3 hxt/900).
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.