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!
im looking at getting these servos since I red bad reviews on the tss-9 digital ones but would like some more information from y'all who have them already.
1.how many oz of torque is it putting out I need at least 30oz (can do with 28)
2.how long is the wire and is it a JR/Futaba connector?
Sean, according to the specs, at 1 cm from the axis, it has 1.6kg of torque which is 56.43oz. and as YSpecV said, it's just shy of 10 inches long (25mm is just shy of 1 inch). These are great little servos and I use them on aircraft that I know will be controlling larger surfaces. Hope this helps and Happy flying!
YSpecV, I've not measured the torque but I do know they are very powerful for their size. I've even used them on tricopters with great results until I would crash on the tail and strip the gears. I posted a video below with my F-22 and in that video I was gunning the throttle (50 - 60mph) and doing quick snap loops. on one occasion it tore a half moon tear around the control horn on the control surface but the servo was fine. I've stripped other servos just from this type of use, but these have held up nicely. Great little servo in my books.
Hi James, This Delta wing is what my last 3 HXT900 servos went on. The elevon surfaces these servos are controlling are 4x10 inches and the rudder is about 4x6 inches. They have no problems controlling this aircraft. But, I need more now.. Ha ha! So I guess it's time to order more and re-stock. All the best and Happy flying!
Don't know if this would be of interest to people here, but I regularly attach these servos to packing tape for my wings. I did a test of 9 different adhesives to see what would work best for this purpose. I was a bit surprised at the result. BTW: These are my favourite servo's for my 30" and 44" wings.
The thrust of your experiment was in the right direction, but! In most experiments it is usual to change only one thing (the type of adhesive I this trial) and keep EVERYTHING else the same. Yes, I know you can change 2, or more, variables but that needs careful experimental design and a good dose of statistical analysis, so let us leave this out.
Most of the lower end servos seem to have a casing made of polystyrene or ABS (usually the latter) and so any adhesive trial should have used one of these polymers to make the trial valid. To say you used some "plastic" , I regret to say, totally invalidates the trial. This is not mean spirited nit picking, but a genuine concern as to the validity of the experiment, which I watched with great anticipation. Plastics ain't plastics as we say here in Oz. The type of plastic must be stated as a controlled variable. I will see what I can come up with in this direction.
Hi Johnny, The method I've been using for quite a while that has never failed is to wrap my servos in masking tape (usually blue) then hot glue them to the foam, foam board, or wood. So far, I've crashed some planes so badly that the foam broke away around the servo but the glue and masking tape held. Also, credit to this HXT900, I was doing some fast loops with my F-22 with elevons. I was probably going a little too fast when I did some and it tore a half moon from the foam (depron) around the control horn. But, the servo survived with no stripped gears. Great little servos especially for the money. All the best and Happy flying!
Ken, you make some good points. I'll concede that I need to do more testing, but even two brands of servos or packing tapes could yield different results, so my suggestion was and is to test for yourself. If you watched the entire video (which I assume you did), it was primarly for servos, but also for other plastic parts to packing tape. That said, to retest I need a good substitute for servo plastic..I'll look around for something better (without wasting servos). If you watch the video though, the glues were sticking to the plastic and not to the packing tape. What do you think that means as far as my testing goes? I'm thinking maybe that instead of clamping I should just put weight on top of the plastic...either that or the brand of packing tape I used is a little waxier than other brands.
Indeed JohnnyCanada I saw the glues sticking to the plastic: this is the entire point of my comment - would the glue stick equally well to polystyrene or ABS polymer?
The cases of the HXT servos seem to be polystyrene, often used in children's toys. It is rigid, though brittle, and moulds with a high degree o f accuracy. I will have a look around for a cheap kid's toy that could be sacrificed in the name of science and see how well it responds to adhesives.
these are servos members of my club have gotten for years seance before i started fly (over 3 years i think). To my knowledge
they have gone unchanged sense they first came out never seen any updates except 1 servo came with black control arms. but they are great little servos for 36" wing span planes like most park flyers.
As the other guys say the servos that are digital say it in the description
( as far as i have seen anyway )
Shame Shame SHAME on hobby king! Why does it not show if these are digital or analog servos? I ordered them already for a 3gx setup and now am hearing that I cannot use these with my 3gx because they are analog servos? Can somebody here confirm this??? I hope the forums im reading are mistaken. :(
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.
19 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
25 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.
3 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.